Quantum Light Source Compatible With Solid State Quantum Memories And Telecom Networks

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Quantum Light Source Compatible with Solid-state Quantum Memories and Telecom Networks

Author : Daniel Rieländer
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Quantum Light Source Compatible with Solid-state Quantum Memories and Telecom Networks by : Daniel Rieländer

Download or read book Quantum Light Source Compatible with Solid-state Quantum Memories and Telecom Networks written by Daniel Rieländer and published by . This book was released on 2017 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This PhD thesis is in the scope of experimental quantum communication. It deals with correlated photon pairs of which one photon is stored in a solid state device, while the other photon is at telecom wavelength. Quantum correlation between a photon at telecom wavelength and a photon stored in a quantum memory is an important resource for future applications like quantum repeaters, allowing the transmission quantum states over long distances. During the first part of this thesis, a novel photon pair source has been developed, based on spontaneous parametric downconversion (SPDC) inside a bow-tie cavity. SPDC is a non-linear process which splits a pump photon sporadically into two correlated photons, called signal and idler photon. The source used in this work has been designed to be compatible with a solid state quantum memory based on a Praseodymium doped crystal, using the atomic frequency comp (AFC) protocol. This material has shown promising properties for classical light storage. However, it features a small storage bandwidth of 4 MHz at 606 nm, which sets stringent requirements for the photons to be stored. To match these requirements the SPDC process takes place inside a bowtie cavity which is resonant with the created signal and idler photons. The difference between storage wavelength and telecom wavelength (1436 nm in our case) leads to widely non-degenerate photon pairs. These double resonance leads to a strong clustering effect, which suppresses a high number of redundant spectral modes. The created photon spectrum is investigated carefully and consists of three clusters with few well separated modes. The width of each mode is around 2 MHz and matches the requirement for the quantum memory. Single mode operation was achieved by placing an additional Fabry-Perot cavity in the idler field at 1436 nm. This resulted in the demonstration of the narrowest photon pairs consisting of a spectral single mode, created by SPDC to date. In the second part of the thesis, heralded single photons at 606 nm were created by the detection of a photon at 1436 nm. These heralded photons were then stored as collective optical excitations in a praseodymium crystal, using the AFC scheme. Non-classical correlation between the heralding photon and the stored and retrieved photons were observed for storage time up to 4 μs, 20 times longer than achieved in previous solid state quantum memory experiments. Further development on the source, led to improved results, including an increase of coincidence count rate by one order of magnitude and a heralding efficiency of 28 %. The single photon nature of the heralded photon was also measured directly by showing strong antibunching of the 606 nm signal field. These improvements made the created photons compatible with the storage in the spin state of the praseodymium level scheme, using the full AFC protocol. That enabled an extended storage time of 11 μs with on demand readout of the stored photon. The last part of the thesis explores another important resource for the distribution of quantum states with a quantum repeater, entanglement between the created photon pairs. Here we show a rather new approach of entanglement, which is well suited for narrow band photons based on frequency bins. We take advantage of the fact that the source naturally creates several energy correlated well separated frequency modes. In order to show the coherent superposition of the frequency modes, we use electro-optical modulators to coherently mix them. We could show high-visibility two-photon interference fringes, a strong indicator for entanglement in the frequency domain. The results presented in this thesis open the door for the demonstration of entanglement between a solid-state spin-wave quantum memory and a photon at telecom wavelength. This represents an important step for the realization of quantum repeaters using solid state resources.

A Telecom-Compatible Quantum Memory in the Solid-State: Single Erbium Ions Coupled to Silicon Nanophotonic Circuits

Author : Mouktik Raha
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.5/5 (152 download)

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Book Synopsis A Telecom-Compatible Quantum Memory in the Solid-State: Single Erbium Ions Coupled to Silicon Nanophotonic Circuits by : Mouktik Raha

Download or read book A Telecom-Compatible Quantum Memory in the Solid-State: Single Erbium Ions Coupled to Silicon Nanophotonic Circuits written by Mouktik Raha and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single atoms and atom-like defects in solids are promising platforms for realizing single photon sources and long-lived quantum memories, which are essential ingredients for the development of long-distance quantum networks. However, most atomic transitions are in the ultraviolet-NIR regions with wavelengths shorter than 1 μm, where propagation losses in optical fibers are prohibitively large. A notable exception is erbium ion, whose optical transition at 1.5 μm is in the "telecom band", allowing minimal fiber transmission losses. Isolating and addressing individual erbium ions using an optical interface have been elusive so far because of the poor emission rate of erbium due to the electric dipole-forbidden nature of its intra-4f optical transition. We report the observation of fluorescence from single erbium ions for the first time. We achieve this by integrating erbium ions in a low loss, small mode-volume silicon nanophotonic cavity and enhancing their emission rate by over two orders of magnitude.A crucial component of optically interfaced solid-state defects-based platforms is high-fidelity, projective measurement of the spin state, which is generally accomplished using fluorescence on an optical cycling transition. We demonstrate that the cavity modifies the local electromagnetic environment of an erbium ion (which otherwise lacks strong cycling transitions) and improves its cyclicity by greater than 100-fold, thus enabling high-fidelity single-shot quantum nondemolition readout of the ion's spin. We also identify dozens of spectrally distinct ions coupled to the same cavity. Combining an optical frequency-domain multiplexing technique and microwave rotations, we individually initialize, manipulate, and perform single-shot spin measurement of six such ions. Our approach is not limited by the spatial separation between individual ions and is readily scalable to tens or hundreds of ions.Finally, we demonstrate coherent coupling of an erbium electronic spin to a nearby nuclear spin and implement single-qubit and two-qubit gates on them, thus extending our platform's prowess as a quantum memory by making a long-lived nuclear spin register available for storage and retrieval of information. These results are a significant step towards realizing long-distance quantum networks by utilizing multiplexed quantum repeater protocols and deterministic quantum logic for photons based on a scalable silicon nanophotonics architecture.

Quantum Memory Protocols for Photonic Solid-state Devices

Author : Kutlu Kutluer
Publisher :
ISBN 13 :
Total Pages : 159 pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Quantum Memory Protocols for Photonic Solid-state Devices by : Kutlu Kutluer

Download or read book Quantum Memory Protocols for Photonic Solid-state Devices written by Kutlu Kutluer and published by . This book was released on 2018 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: A photonic quantum memory (QM) is a device that has the capability of storing a quantum state of light and retrieving back after a controlled time. It is an important element in quantum information science and is, among other applications, a crucial device for quantum repeater architectures which have been proposed to overcome the loss and the decoherence issues in long distance transmission of photons. Rare earth ion doped solid state systems are promising candidates for QMs which combine the advantages of solid state systems, such as scalability and reduced experimental complexity, with the long coherence time typically found in atomic systems. In this thesis, I investigated three different QM protocols in a Pr3+:Y2SiO5 crystal. The first part describes here the first demonstration of the spectral hole memory (SHoMe) protocol which was proposed theoretically in 2009. This protocol relies on slowing down the light in a long-lived spectral hole and transferring the excitations to the spin state. We first prepare a spectral hole, then send an input pulse whose bandwidth is comparable with the hole and stop the compressed light in the crystal by transferring the off-resonant coherence to the spin state with an optical p pulse. Later a second p pulse transfers the coherence back and leads to the emission of the stored light. We reached a storage and retrieval efficiency of around 40% in the classical regime, and of 31% in the single photon level, with a signal-to-noise ratio of 33 ± 4 for a mean input photon number of 1. These results demonstrate the most efficient and noiseless spin-wave solid-state optical memory at the single photon level to date. The second part of the thesis describes new experiments using the well-known atomic frequency comb (AFC) protocol. It is based on tailoring the inhomogeneously broadened absorption profile of the rare earth with periodic absorptive peaks, which induces the re-emission of the absorbed light field after a certain time determined by the separation between the peaks. In this chapter I describe several AFC experiments. First I present the storage of frequency converted telecom photons into our crystal where we obtained a total efficiency of 1.9 ± 0.2 % for a storage time of 1.6 μs storage time and signal-to-noise ratio of more than 200 for a mean input photon number of 1. Then I discuss the results of improved excited state storage efficiency values for long storage times where we achieved 30% at short storage times and up to 17% at 10 μs storage time. And finally I present a spin-wave AFC experiment where we obtained a signal-to-noise ratio value of 28 ± 8 for a mean input photon number of 1, the highest value achieved so far for this kind of experiment. Finally, in the last part, I describe the first demonstration of a solid-state photon pair source with embedded multimode quantum memory. The aim of the protocol is to combine a single photon source and a QM in one ensemble as in the well-known Duan-Lukin-Zoller-Cirac (DLCZ) scheme however this time not in a cold atomic ensemble but in a solid-state crystal. The protocol takes advantage of the AFC protocol for rephasing the ions and obtaining efficient read-out. The use of AFC also makes the protocol temporally multi-mode. In the experiment, after the AFC preparation we send an on-resonant write pulse and detect the decayed Stokes photons which herald single spin excitations. At a later time a read pulse transfers the spin excitation back to the excited state and we detect the anti-Stokes photons. We show strong non-classical second order cross-correlations between the Stokes and anti-Stokes photons and demonstrate storage of 11 temporal modes. The results presented in this thesis represent a significant contribution to the field of solid-state quantum memories and an important steps towards the realization of scalable quantum network architectures with solid state systems.

A Multimode Solid-state Quantum Memory for Single Photons

Author : Alessando Seri
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis A Multimode Solid-state Quantum Memory for Single Photons by : Alessando Seri

Download or read book A Multimode Solid-state Quantum Memory for Single Photons written by Alessando Seri and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum memories (QMs) for light represent a fundamental ingredient for the development of a quantum internet. Among other applications, they are a building block for the distribution of entanglement on large scale, i.e. for the realization of a quantum repeater architecture. Rare earth doped crystals (REDCs) are a promising candidate towards this goal. In my thesis I use a Pr3+:Y2SiO5 crystal. The longest storage time and the highest retrieval efficiency for a solid-state memory measured so far, were demonstrated with this system (in the classical regime). However, the main advantages of solid-state platforms are their suitability for miniaturization and integration as well as their inhomogeneous broadening, which enables broadband storage and spectral multiplexing. In this thesis we demonstrate an on-demand solid-state QM for real single photons. Moreover we study new platforms for integrated QM based on the same material. We employ the atomic frequency comb (AFC) technique, which is the most promising storage protocol in terms of temporal multiplexing up to now. Until the start of my PhD there was still no demonstration of storage of a real quantum state of light with an on-demand readout in REDCs. We achieved this in the course of this thesis, measuring also for the first time (and only, at the time of writing) non-classical correlation between a single spin wave in a solid-state QM and a telecom photon. After proving the suitability of Pr3+:Y2SiO5 crystals for on-demand QMs, we demonstrated novel types of integrated optical memories based on the same system. We studied the spectroscopic and coherence properties of the ions in laser-written waveguides fabricated by fs-laser micromachining. These projects were developed in collaboration with Dr. R. Osellame and Dr. G. Corrielli at Politecnico di Milano, who fabricated the waveguides and analysed their guiding properties. In a first kind of waveguide, called type II, we performed the first storage with on-demand retrieval ever done in solid-state integrated optical memories (with classical light). We continued analysing a so-called type I waveguide, in which the mode-size is comparable with the mode guided in a single-mode fiber at the same wavelength. Here we showed storage of heralded single-photons for a pre-programmed time. The demonstrated storage time, 5.5 μs, is the longest quantum storage demonstrated in any integrated waveguide up to now. Finally, we performed in the same waveguide storage of the whole spectrum of a frequency-multiplexed heralded photon, spanning a range of frequencies of ̃ 4 GHz. The photon is naturally multiplexed due to the generation method used, namely cavity-enhanced SPDC. The possibility of storing such a broad spectrum comes from the intrinsic inhomogeneous broadening present in REDCs. Together with the 15 frequency modes constituting the multiplexed photon, 9 temporal modes were stored thanks to the intrinsic temporal multimodality of the AFC protocol. The method used to fabricate our waveguides, fs-laser micromachining, is the only one to our knowledge that allows for direct 3D fabrication in the substrate. In the future, this will yield matrices of fiber-pigtailed waveguide-based QMs, thus enabling a high degree of spatial multiplexing, which nowadays is mostly exploited in atomic clouds, where temporal and spectral multiplexing are more difficult to achieve. The crystal, the protocol and the waveguide fabrication technique employed in this thesis, represent all together a very promising system, opening the way for a future quantum repeater architecture based on scalable highly multiplexed QMs.

Narrowband Single Photons for Light-Matter Interfaces

Author : Markus Rambach
Publisher : Springer
ISBN 13 : 3319971549
Total Pages : 154 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Narrowband Single Photons for Light-Matter Interfaces by : Markus Rambach

Download or read book Narrowband Single Photons for Light-Matter Interfaces written by Markus Rambach and published by Springer. This book was released on 2018-08-28 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a step-by-step guide on how to construct a narrowband single photon source for the integration with atom-based memory systems. It combines the necessary theoretical background with crucial experimental methods and characterisations to form a complete handbook for readers at all academic levels. The future implementation of large quantum networks will require the hybridisation of photonic qubits for communication with quantum memories in the context of information storage. Such an interface requires carefully tailored single photons to ensure compatibility with the chosen memory. The source itself is remarkable for a number of reasons, including being the spectrally narrowest and brightest source of its kind; in addition, it offers a novel technique for frequency stabilisation in an optical cavity, together with exceptional portability. Starting with a thorough analysis of the current literature, this book derives the essential parameters needed to design the source, describes its individual components in detail, and closes with the characterisation of a single photon source.

Handbook on the Physics and Chemistry of Rare Earths

Author :
Publisher : Elsevier
ISBN 13 : 0444632646
Total Pages : 170 pages
Book Rating : 4.4/5 (446 download)

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Book Synopsis Handbook on the Physics and Chemistry of Rare Earths by :

Download or read book Handbook on the Physics and Chemistry of Rare Earths written by and published by Elsevier. This book was released on 2014-11-27 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook on the Physics and Chemistry of Rare Earths is a continuous series of books covering all aspects of rare earth science - chemistry, life sciences, materials science, and physics. The main emphasis of the Handbook is on rare earth elements [Sc, Y and the lanthanides (La through Lu)] but whenever relevant, information is also included on the closely related actinide elements. The individual chapters are comprehensive, broad, up-to-date critical reviews written by highly experienced invited experts. The series, which was started in 1978 by Professor Karl A. Gschneidner Jr., combines and integrates both the fundamentals and applications of these elements and now publishes two volumes a year. Individual chapters are comprehensive, broad, critical reviews Contributions are written by highly experienced, invited experts Up-to-date overviews of developments in the field

Solid-state Optical Quantum Memory

Author : Peter Clemens Strassmann
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (113 download)

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Book Synopsis Solid-state Optical Quantum Memory by : Peter Clemens Strassmann

Download or read book Solid-state Optical Quantum Memory written by Peter Clemens Strassmann and published by . This book was released on 2019 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Quantum Photonics: Pioneering Advances and Emerging Applications

Author : Robert W. Boyd
Publisher : Springer
ISBN 13 : 3319984020
Total Pages : 646 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Quantum Photonics: Pioneering Advances and Emerging Applications by : Robert W. Boyd

Download or read book Quantum Photonics: Pioneering Advances and Emerging Applications written by Robert W. Boyd and published by Springer. This book was released on 2019-02-19 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together reviews by internationally renowed experts on quantum optics and photonics. It describes novel experiments at the limit of single photons, and presents advances in this emerging research area. It also includes reprints and historical descriptions of some of the first pioneering experiments at a single-photon level and nonlinear optics, performed before the inception of lasers and modern light detectors, often with the human eye serving as a single-photon detector. The book comprises 19 chapters, 10 of which describe modern quantum photonics results, including single-photon sources, direct measurement of the photon's spatial wave function, nonlinear interactions and non-classical light, nanophotonics for room-temperature single-photon sources, time-multiplexed methods for optical quantum information processing, the role of photon statistics in visual perception, light-by-light coherent control using metamaterials, nonlinear nanoplasmonics, nonlinear polarization optics, and ultrafast nonlinear optics in the mid-infrared.

Photonic Quantum Technologies

Author : Mohamed Benyoucef
Publisher : John Wiley & Sons
ISBN 13 : 3527837434
Total Pages : 910 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis Photonic Quantum Technologies by : Mohamed Benyoucef

Download or read book Photonic Quantum Technologies written by Mohamed Benyoucef and published by John Wiley & Sons. This book was released on 2023-05-04 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonic Quantum Technologies Brings together top-level research results to enable the development of practical quantum devices In Photonic Quantum Technologies: Science and Applications, the editor Mohamed Benyoucef and a team of distinguished scientists from different disciplines deliver an authoritative, one-stop overview of up-to-date research on various quantum systems. This unique book reviews the state-of-the-art research in photonic quantum technologies and bridges the fundamentals of the field with applications to provide readers from academia and industry, in one-location resource, with cutting-edge knowledge they need to have to understand and develop practical quantum systems for application in e.g., secure quantum communication, quantum metrology, and quantum computing. The book also addresses fundamental and engineering challenges en route to workable quantum devices and ways to circumvent or overcome them. Readers will also find: A thorough introduction to the fundamentals of quantum technologies, including discussions of the second quantum revolution (by Nobel Laureate Alain Aspect), solid-state quantum optics, and non-classical light and quantum entanglement Comprehensive explorations of emerging quantum technologies and their practical applications, including quantum repeaters, satellite-based quantum communication, quantum networks, silicon quantum photonics, integrated quantum systems, and future vision Practical discussions of quantum technologies with artificial atoms, color centers, 2D materials, molecules, atoms, ions, and optical clocks Perfect for molecular and solid-state physicists, Photonic Quantum Technologies: Science and Applications will also benefit industrial and academic researchers in photonics and quantum optics, graduate students in the field; engineers, chemists, and computer and material scientists.

Narrowband Photon Pair Source Compatible with Solid State Quantum Memories

Author : Darío Lago Rivera
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Narrowband Photon Pair Source Compatible with Solid State Quantum Memories by : Darío Lago Rivera

Download or read book Narrowband Photon Pair Source Compatible with Solid State Quantum Memories written by Darío Lago Rivera and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The generation of narrowband photon pairs compatible with solid state quantum memories is shown and analysed. This study is made in two different steps. In the beginning we implement a photon pair source with a periodically poled lithium niobate crystal in free space configuration. The photon pairs are characterized and their cross-correlation is measured. The source is also used as heralded single photon source, with the single photon character shown with a direct antibunching measurement. In a second step the crystal is embedded in a resonator to generate narrowband photons. Cavity enhancement is observed and the quantum behaviour of the photons is analysed. The final source is able to generate photon pairs with one photon at 606 nm while the other photon, at 1436 nm, will be used as herald. The biphoton bandwidth is

Quantum Frecuency Conversion for Hybrid Quantum Networks

Author : Nicolas Maring
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Quantum Frecuency Conversion for Hybrid Quantum Networks by : Nicolas Maring

Download or read book Quantum Frecuency Conversion for Hybrid Quantum Networks written by Nicolas Maring and published by . This book was released on 2018 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to control the optical frequency of quantum state carriers (i.e. photons) is an important functionality for future quantum networks. It allows all matter quantum systems - nodes of the network - to be compatible with the telecommunication C-band, therefore enabling long distance fiber quantum communication between them. It also allows dissimilar nodes to be connected with each other, thus resulting in heterogeneous networks that can take advantage of the different capabilities offered by the diversity of its constituents. Quantum memories are one of the building blocks of a quantum network, enabling the storage of quantum states of light and the entanglement distribution over long distances. In our group, two different types of memories are investigated: a cold atomic ensemble and an ion-doped crystal. In this thesis I investigate the quantum frequency conversion of narrow-band photons, emitted or absorbed by optical quantum memories, with two different objectives: the first one is to connect quantum memories emitting or absorbing visible single photons with the telecommunication wavelengths, where fiber transmission loss is minimum. The second and main goal is to study the compatibility between disparate quantum nodes, emitting or absorbing photons at different wavelengths. More precisely the objective is to achieve a quantum connection between the two optical memories studied using quantum frequency conversion techniques. The main core of this work is the quantum frequency conversion interface that bridges the gap between the cold ensemble of Rubidium atoms, emitting photons at 780nm, and the Praseodymium ion doped crystal, absorbing photons at 606nm. This interface is composed of two different frequency conversion devices, where a cascaded conversions takes place: the first one converts 780nm photons to the telecommunication C-band, and the second one converts them back to visible, at 606nm. This comes with several challenges such as conversion efficiency, phase stability and parasitic noise reduction, which are important considerations to show the conservation of quantum behaviors through the conversion process. This work can be divided in three parts. In a first one, we built a quantum frequency conversion interface between 606nm and the C-band wavelength, capable of both up and down-conversion of single photon level light. We also characterized the noise processes involved in this specific conversion. In the down-conversion case we showed that memory compatible heralded single photons emitted from a photon pair source preserve their non-classical properties through the conversion process. In the up-conversion case, we showed the storage of converted telecom photons in the praseodymium doped crystal, and their retrieval with high signal to noise ratio. The second part of the work was devoted to the conversion of photons from an emissive Rubidium atomic quantum memory to the telecom C band. In this work we converted the heralding photons from the atomic ensemble and measured non-classical correlations between a stored excitation and a C-band photon, necessary for quantum repeater applications. In the last part of the thesis, we setup the full frequency conversion interface and showed that heralded photons emitted by the atomic ensemble are converted, stored in the solid state memory and retrieved with high signal to noise ratio. We demonstrated that a single collective excitation stored in the atomic ensemble is transfered to the crystal by mean of a single photon at telecom wavelength. We also showed time-bin qubit transfer between the two quantum memories. This work represents the first proof of principle of a photonic quantum connection between disparate quantum memory nodes. The results presented in this thesis pave the way towards the realization of modular and hybrid quantum networks.

Generation and Storage of Optical Entanglement in a Solid State Spin-wave Quantum Memory

Author : Katherine Rose Ferguson
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)

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Book Synopsis Generation and Storage of Optical Entanglement in a Solid State Spin-wave Quantum Memory by : Katherine Rose Ferguson

Download or read book Generation and Storage of Optical Entanglement in a Solid State Spin-wave Quantum Memory written by Katherine Rose Ferguson and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates an entangled light source with an in-built quantum memory based on the protocol of rephased amplified spontaneous emission (RASE). RASE has promising applications as a building-block of a quantum repeater: a device essential for extending the range of current quantum communication links. To be useful RASE must be able to produce high fidelity non-classical light with high efficiency, and be able to store multimode entanglement for long times. This thesis characterises the RASE source and determines to what degree these requirements can be met. The experimental RASE demonstration was conducted in a rare-earth ion doped crystal. Rare-earth ions provide a particularly promising platform for developing quantum technologies as they possess long coherence times on both the optical and hyperfine transitions. In the RASE protocol an inverted ensemble of two-level atoms amplifies the vacuum fluctuations resulting in amplified spontaneous emission (ASE). This results in entanglement between the output optical field and the collective modes of the amplifying ensemble. The collective atomic state dephases due to the inhomogeneous broadening of the ensemble but this can be rephased using photon echo techniques. When the ensemble rephases, a second optical field, the rephased amplified spontaneous emission (RASE), is emitted and is entangled with the ASE. In this thesis, a modified four-level rephasing scheme is used that allows the single photon signals to be spectrally resolved from any coherent background emission associated with the bright driving fields. In addition, four-level RASE incorporates storage on the long-lived hyperfine ground states. Two experiments are described in this thesis. First, a free-space four-level RASE demonstration using continuous-variable detection. In this experiment the different sources of noise were characterised and low noise operation was shown to be possible. Entanglement of the ASE and RASE was confirmed by violating the inseparability criterion with 98.6% confidence. In addition, entanglement was demonstrated after storage of the collective atomic state on the spin states and RASE was shown to be temporally multimode, with almost perfect distinguishability between two temporal modes demonstrated. The degree of entanglement between the ASE and RASE was limited by the rephasing efficiency, which saturated at 3%. It was determined that distortion of the rephasing pulses as they propagate through the optically thick ensemble was the probable cause of the low efficiency. The second experiment was a preliminary cavity-enhanced RASE demonstration. Theoretically perfect rephasing efficiency can be obtained by placing the crystal in an impedance-matched optical cavity. The initial cavity design showed encouraging evidence of an enhancement in the rephasing efficiency, with a 4-fold improvement over the free-space experiment. Improvements to the cavity design were proposed to allow a further increase in the rephasing efficiency of RASE. In summary, this thesis provides an extensive characterisation of an entangled light source with an in-built quantum memory based on rephasing spontaneous emission from an ensemble of ions. Importantly, the RASE scheme allows generation and storage of entanglement in a single protocol, which holds great promise for the development of integrated quantum networks.

Quantum Memories for Telecommunication Networks

Author : Björn Lauritzen
Publisher :
ISBN 13 :
Total Pages : 85 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Quantum Memories for Telecommunication Networks by : Björn Lauritzen

Download or read book Quantum Memories for Telecommunication Networks written by Björn Lauritzen and published by . This book was released on 2010 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Quantum Photonics

Author : Yasuhiko Arakawa
Publisher : Elsevier
ISBN 13 : 0323985580
Total Pages : 564 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Quantum Photonics by : Yasuhiko Arakawa

Download or read book Quantum Photonics written by Yasuhiko Arakawa and published by Elsevier. This book was released on 2024-06-28 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum Photonics aims to serve as a comprehensive and systematic reference source for entrants to the field of quantum photonics, including updated topics on quantum photonics for researchers working in this field. The book reviews the fundamental knowledge of modern photonics related quantum technologies, key concepts of quantum photonic devices, and quantum photonics applications. The book is suitable for graduate students, researchers, and engineers who want to learn quantum photonics fundamentals. The editors, who are leaders in this field, have formulated this book as an introduction to the cutting-edge research in quantum photonics. Researchers and students involved in the development of semiconductor optoelectronics and optical communication systems should also find this book helpful. Covers the whole quantum photonics field, including nanostructured materials, physics, modelling, and quantum technology applications ranging from applications of q-bit emitters to quantum dot lasers Comprehensively and systematically reviews fundamentals and applications of quantum photonics for beginners in the field Provides foundational knowledge for modern photonics-related quantum technologies

Exploring Storage Capability of a Solid-state Quantum Memory for Light

Author : Alexey Tiranov
Publisher :
ISBN 13 :
Total Pages : 219 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Exploring Storage Capability of a Solid-state Quantum Memory for Light by : Alexey Tiranov

Download or read book Exploring Storage Capability of a Solid-state Quantum Memory for Light written by Alexey Tiranov and published by . This book was released on 2016 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Building Efficient Light-matter Interfaces for Quantum Systems

Author : Tsung-Ju Jeff Lu
Publisher :
ISBN 13 :
Total Pages : 85 pages
Book Rating : 4.:/5 (943 download)

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Book Synopsis Building Efficient Light-matter Interfaces for Quantum Systems by : Tsung-Ju Jeff Lu

Download or read book Building Efficient Light-matter Interfaces for Quantum Systems written by Tsung-Ju Jeff Lu and published by . This book was released on 2015 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efficient collection of photons from quantum memories, such as quantum dots (QDs) and nitrogen vacancy (NVs) centers in diamond, is essential for various quantum technologies. This thesis describes the design, fabrication, and utilization of novel photonic structures and systems to achieve potentially world-record photon collection from quantum dots. This technique can also be applied to NVs in diamond in the near future. Also, the NV- charged state has second-scale coherence times at room temperature that make it a promising candidate for solid state memories in quantum computers and quantum repeaters. NV- is an individually addressable qubit system that can be optically initialized, manipulated, and measured. On-chip entanglement generation would be the basis of scalability for quantum information processing technologies. These properties have enabled recent demonstrations of heralded quantum entanglement and teleportation between two separated NV centers. To improve the entanglement probability in such schemes, it is imperative to improve the efficiency with which single photons from a NV center can be guided into a low-loss single-mode waveguide. As such, a second component of this thesis focuses on the development of a photonic integrated circuit based on aluminum nitride that would incorporate pre-selected, long-lived NV center quantum memories as well as pre-selected, high-performance superconducting nanowire single-photon detectors (SNSPDs). This hybrid device would have the capability to perform on-chip entanglement of photons from separate quantum memories to build up a quantum repeater necessary for long-distance quantum communication and distributed quantum computing.

A Scalable Quantum Computation Platform

Author : Sara Lambert Mouradian
Publisher :
ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis A Scalable Quantum Computation Platform by : Sara Lambert Mouradian

Download or read book A Scalable Quantum Computation Platform written by Sara Lambert Mouradian and published by . This book was released on 2018 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum computation and communication systems exploit quantum mechanical effects to surpass their classical counterparts in certain applications. However, while proof-of-principle experimental demonstrations have been performed, these are limited to a handful of nodes with limited - and often immutable - connectivity. Here we demonstrate an integrated platform for solid state quantum information processing. Pre-characterized solid state quantum nodes (nitrogen vacancy centers in diamond nanophotonic structures) are placed into a photonic integrated circuit which allows for low-loss and phase-stable collection, routing, and detection of photons as well as on-chip state manipulation and classical control. Moreover, the fabrication of high-quality photonic resonators in diamond allows for the increased emission and collection rates of photons coherent with the spin state. These two advances promise an on-chip entanglement rate much larger than the decoherence rate, allowing the creation and maintenance of cluster states for quantum computation.