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Nuclear Spin Interactions And Coherent Control In Rare Earth Ion Doped Crystals For Quantum Computing
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Book Synopsis Nuclear Spin Interactions and Coherent Control in Rare-earth-ion-doped Crystals for Quantum Computing by : Hafsa Syed
Download or read book Nuclear Spin Interactions and Coherent Control in Rare-earth-ion-doped Crystals for Quantum Computing written by Hafsa Syed and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent Interactions in Rare-earth-ion-doped Crystals for Applications in Quantum Information Science by : Mattias Nilsson
Download or read book Coherent Interactions in Rare-earth-ion-doped Crystals for Applications in Quantum Information Science written by Mattias Nilsson and published by . This book was released on 2004 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hybrid quantum system based on rare earth doped crystals by : Probst, Sebastian
Download or read book Hybrid quantum system based on rare earth doped crystals written by Probst, Sebastian and published by KIT Scientific Publishing. This book was released on 2016-09-05 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid quantum circuits interfacing rare earth spin ensembles with microwave resonators are a promising approach for application as coherent quantum memory and frequency converter. In this thesis, hybrid circuits based on Er and Nd ions doped into Y?SiO? and YAlO? crystals are investigated by optical and on-chip microwave spectroscopy. Coherent strong coupling between the microwave resonator and spin ensemble as well as a multimode memory for weak coherent microwave pulses are demonstrated.
Book Synopsis Light-Matter Interaction and Quantum Computing in Rare-Earth-Ion-Doped Crystals by : Adam Kinos
Download or read book Light-Matter Interaction and Quantum Computing in Rare-Earth-Ion-Doped Crystals written by Adam Kinos and published by . This book was released on 2018 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical Control and Quantum Chaos with a High-Spin Nucleus in Silicon by : Serwan Asaad
Download or read book Electrical Control and Quantum Chaos with a High-Spin Nucleus in Silicon written by Serwan Asaad and published by Springer Nature. This book was released on 2021-10-19 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear spins are highly coherent quantum objects that were featured in early ideas and demonstrations of quantum information processing. In silicon, the high-fidelity coherent control of a single phosphorus (31-P) nuclear spin I=1/2 has demonstrated record-breaking coherence times, entanglement, and weak measurements. In this thesis, we demonstrate the coherent quantum control of a single antimony (123-Sb) donor atom, whose higher nuclear spin I = 7/2 corresponds to eight nuclear spin states. However, rather than conventional nuclear magnetic resonance (NMR), we employ nuclear electric resonance (NER) to drive nuclear spin transitions using localized electric fields produced within a silicon nanoelectronic device. This method exploits an idea first proposed in 1961 but never realized experimentally with a single nucleus, nor in a non-polar crystal such as silicon. We then present a realistic proposal to construct a chaotic driven top from the nuclear spin of 123-Sb. Signatures of chaos are expected to arise for experimentally realizable parameters of the system, allowing the study of the relation between quantum decoherence and classical chaos, and the observation of dynamical tunneling. These results show that high-spin quadrupolar nuclei could be deployed as chaotic models, strain sensors, hybrid spin-mechanical quantum systems, and quantum-computing elements using all-electrical controls.
Book Synopsis Hybrid Quantum System Based on Rare Earth Doped Crystals by : Sebastian Probst
Download or read book Hybrid Quantum System Based on Rare Earth Doped Crystals written by Sebastian Probst and published by . This book was released on 2020-10-09 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid quantum circuits interfacing rare earth spin ensembles with microwave resonators are a promising approach for application as coherent quantum memory and frequency converter. In this thesis, hybrid circuits based on Er and Nd ions doped into Y?SiO? and YAlO? crystals are investigated by optical and on-chip microwave spectroscopy. Coherent strong coupling between the microwave resonator and spin ensemble as well as a multimode memory for weak coherent microwave pulses are demonstrated. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Book Synopsis Coherent Control of Nuclear and Electron Spins for Quantum Information Processing by : Kyungdeock Park
Download or read book Coherent Control of Nuclear and Electron Spins for Quantum Information Processing written by Kyungdeock Park and published by . This book was released on 2015 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to perform quantum error correction (QEC) arbitrarily many cycles is a significant challenge for scalable quantum information processing (QIP). Key requirements for multiple-round QEC are a high degree of quantum control, the ability to efficiently characterize both intrinsic and extrinsic noise, and the ability to dynamically and efficiently extract entropy from ancilla qubits. Nuclear Magnetic Resonance (NMR) based quantum devices have demonstrated high control fidelity with up to 12 qubits, and the noise characterizations can be performed using an efficient protocol known as randomized benchmarking. One of the remaining challenges with NMR systems is that qubit initialization is normally only attainable via thermal equilibration. This results in very low polarizations in reasonable experimental conditions. Moving to electron-nuclear coupled spin systems in a single crystal is a promising solution to the ancilla qubit preparation problem. One obvious advantage of incorporating electron spins comes from higher gyromagnetic ratio of the electron which yields about three orders of magnitude larger thermal spin polarization than that of nuclear spins in the same experimental condition. In addition, fast control of nuclear spins is possible provided appropriate level of anisotropic hyperfine interaction strength. The nuclear spins can be polarized even beyond the thermal electron spin temperature using a technique Heat-Bath Algorithmic Cooling (HBAC). With theoretical ideas in hand, the next step is to develop classical instrumentations to control electron-nuclear coupled systems and accomplish high fidelity coherent control. Noise characterizations are also necessary for benchmarking the quality of control over the electron-nuclear spin system. I first present example applications of NMR QIP with small number of qubits: Testing a foundational question in quantum mechanics and measuring spectral density of noise in a quantum system. Then I report on our home-built X-band electron spin resonance (ESR) spectrometer and progress in achieving high fidelity coherent control of electron and nuclear spins for QIP. We focus on implementing nuclear spin manipulation via anisotropic hyperfine interaction and microwave (mw) control, but discussions also include electron nuclear double resonance (ENDOR) control techniques. We perform realistic algorithmic simulations to show that an experimental cooling of nuclear spins below electron thermal temperature is feasible, and to present the electron-nuclear spin systems as promising testbeds for scalable QIP.
Book Synopsis Spin Dynamics in Rare-earth-ion-doped Crystals for Optical Quantum Memories by : Emmanuel Zambrini Cruzeiro
Download or read book Spin Dynamics in Rare-earth-ion-doped Crystals for Optical Quantum Memories written by Emmanuel Zambrini Cruzeiro and published by . This book was released on 2017 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Quantum Information Storage in Rare Earth Doped Materials by : Annabel Lucy Alexander
Download or read book Investigation of Quantum Information Storage in Rare Earth Doped Materials written by Annabel Lucy Alexander and published by . This book was released on 2007 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical Investigation of Robust Quantum Computing in Rare-earth-ion Doped Crystals by : Ingela Roos
Download or read book Theoretical Investigation of Robust Quantum Computing in Rare-earth-ion Doped Crystals written by Ingela Roos and published by . This book was released on 2003 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dopant Qubits in Direct Band Gap Materials by : Xiayu Linpeng
Download or read book Dopant Qubits in Direct Band Gap Materials written by Xiayu Linpeng and published by . This book was released on 2020 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information is currently one of the most important research fields in physics. The dopant qubits in direct band gap materials are promising candidates to build large- scale photon-based quantum network for applications in quantum computation and quantum communication. In this thesis, we study the optical and spin properties of different dopant systems in order to find the best one as a qubit candidate. The first study of dopant qubits in direct band gap materials was on donors in GaAs, from Yamamoto's group about 10 years ago. The donor qubits in GaAs only have ns-scale dephasing time which is limited by inhomogeneous hyperfine fields in the crystal. In order to improve the coherence time, we study the acceptors in GaAs which use the hole spins as the qubit states instead of the electron spins for donors. As the hole has a Bloch wave function with p-symmetry, the overlap with nuclear spin is zero thus the hyperfine interaction is weaker. However, from our measurements, we find the dephasing time is still in ns-scale. This short dephasing time is because of the long-range dipole-dipole hyperfine interaction together with a non-zero heavy-hole-light-hole mixing. As the acceptor system does not show specific advantages, we move back to the donor system and study the system in different materials. We have performed a systematic study of the longitudinal spin relaxation time T1 for donor qubits in three different materials (GaAs, InP, and CdTe). For these three materials, the spin relaxation times are all in ms-scale and our theory study shows the T1 is limited by phonon interaction mediated by spin-orbit coupling. Though none of these three materials show great coherence properties, this T1 study leads to our research on donors in ZnO which is a material with much weaker spin-orbit coupling thus longer T1. We have demonstrated optical spin initialization and coherent control for donors in ZnO. With these spin-control techniques, we have measured a T1 up to hundreds of ms, an inhomogeneous dephasing time T2* of 17 ns and a spin-echo dephasing time T2 of 50 Îơs. The donors in ZnO have T1 several orders of magnitudes higher than the other dopant systems we have studied. Even though the T2* is only in ns-scale, ZnO can potentially get nuclear-spin-free isotopic purification, which can greatly enhance the dephasing time. To utilize donors in ZnO for the quantum network applications, it is necessary to get single donor and high-fidelity spin control. We show our current progress on single donor isolation with focused ion beam and high-fidelity spin control with microwave. Though these two tasks are not accomplished yet, the progress is promising and we expect they can be achieved in the next few years.
Book Synopsis A First Step Towards Quantum Computing in Rare-earth-ion-doped Crystals by : Tomas Christiansson
Download or read book A First Step Towards Quantum Computing in Rare-earth-ion-doped Crystals written by Tomas Christiansson and published by . This book was released on 2001 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of a Stoichiometric Rare Earth Crystal for Quantum Computing by : Rose Ahlefeldt
Download or read book Evaluation of a Stoichiometric Rare Earth Crystal for Quantum Computing written by Rose Ahlefeldt and published by . This book was released on 2013 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a spectroscopic study of the 7F0-5D0 transition of Eu3+ in EuCl3.6H2O, which is used to evaluate the potential performance of a quantum computing system implemented in EuCl3.6H2O and, more generally, in stoichiometric rare earth crystals. EuCl3.6H2O has one of the narrowest optical inhomogeneous linewidths of any solid but this linewidth is shown to be still much larger than that required for practical quantum computing in a rare earth crystal. To assess the possibility of reducing the linwidth, the contributions of isotopic impurities to both the optical linewidth and line structure were investigated, and ligand isotopes were identified as a major source of both inhomogeneous broadening and structure on the optical transition, suggesting that the linewidth could be substantially reduced by isotopically purifying EuCl3.6H2O. The effect of ligand isotopes on the optical lifetime and coherence time was also investigated. It was found that fully deuterating the crystal to EuCl3.6D2O substantially improves both the lifetime and coherence time. The satellite lines formed in the optical spectrum of a rare earth crystal when it is doped with another rare earth are proposed as qubits. A crucial step in characterising EuCl3.6H2O for quantum computing is associating these satellite lines in EuCl3.6H2O with crystallographic sites. A new method for associating sites with lines, which works for low symmetry crystals such as EuCl3.6H2O, is presented. This method involves modelling the splitting of the ground state hyperfine levels caused by the magnetic dipole-dipole interaction between a Kramers dopant and the Eu3+ ion. Using this method, most of the outer satellite lines in rare earth doped EuCl3.6H2O were assigned to crystallographic sites. It has been proposed that the electronic interactions between these satellite lines be used to enact two-qubit gates in a rare earth quantum computer. These interactions were measured between a number of different satellite lines using a new two-laser spectral holeburning technique. Interactions of up to 46.081 +- 0.005 MHz were observed, and this was the first time that electronic interactions between weakly coupled rare earth ions had been measured. The two most common interactions identified between rare earth ions in solids are electric dipole-dipole and exchange, but the observed interactions are stronger than expected from a electric dipole-dipole model and occur at too large a distance to be superexchange. It is shown that the development of a moderate-sized quantum processor, one with more than 10 qubits, in a stoichiometric rare earth crystal is feasible provided that the optical inhomogeneous linewidth is reduced below 1 MHz. Demonstrations of three or four qubit devices should be possible using existing materials.
Book Synopsis Towards Solid-State Quantum Repeaters by : Kristiaan De Greve
Download or read book Towards Solid-State Quantum Repeaters written by Kristiaan De Greve and published by Springer. This book was released on 2016-08-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Towards Solid-State Quantum Repeaters: Ultrafast, Coherent Optical Control and Spin-Photon Entanglement in Charged InAs Quantum Dots summarizes several state-of-the-art coherent spin manipulation experiments in III-V quantum dots. Both high-fidelity optical manipulation, decoherence due to nuclear spins and the spin coherence extraction are discussed, as is the generation of entanglement between a single spin qubit and a photonic qubit. The experimental results are analyzed and discussed in the context of future quantum technologies, such as quantum repeaters. Single spins in optically active semiconductor host materials have emerged as leading candidates for quantum information processing (QIP). The quantum nature of the spin allows for encoding of stationary, memory quantum bits (qubits), and the relatively weak interaction with the host material preserves the spin coherence. On the other hand, optically active host materials permit direct interfacing with light, which can be used for all-optical qubit manipulation, and for efficiently mapping matter qubits into photonic qubits that are suited for long-distance quantum communication.
Book Synopsis Coherent Control of Hyperfine-coupled Electron and Nuclear Spins for Quantum Information Processing by : Jamie Chiaming Yang
Download or read book Coherent Control of Hyperfine-coupled Electron and Nuclear Spins for Quantum Information Processing written by Jamie Chiaming Yang and published by . This book was released on 2008 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coupled electron-nuclear spins are promising physical systems for quantum information processing: By combining the long coherence times of the nuclear spins with the ability to initialize, control, and measure the electron spin state, the favorable properties of each spin species are utilized. This thesis discusses a procedure to initialize these nuclear spin qubits, and presents a vision of how these systems could be used as the fundamental processing unit of a quantum computer. The focus of this thesis is on control of a system in which a single electron spin is coupled to N nuclear spins via resolvable anisotropic hyperfine (AHF) interactions. High-fidelity universal control of this le-Nn system is possible using only excitations on a single electron spin transition. This electron spin actuator control is implemented by using optimal control theory to find the modulation sequences that generate the desired unitary operations. Decoherence and the challenge of making useful qubits from these systems are also discussed. Experimental evidence of control using an electron spin actuator was acquired with a custom-built pulsed electron spin resonance spectrometer. Complex modulation sequences found by the GRadient Ascent Pulse Engineering (GRAPE) algorithm were used to perform electron spin echo envelope modulation (ESEEM) experiments and simple preparation-quantum operation-readout experiments on an ensemble of 1e-1n systems. The data provided evidence that we can generate any unitary operation on an AHF-coupled 1e-1n system while sitting on a single transmitter frequency. The data also guided design of the next iteration of these experiments, which will include an improved spectrometer, bandwidth-constrained GRAPE, and samples with larger Hilbert spaces.
Book Synopsis Quantum Information Processing in Rare-earth-ion Doped Crystals by : Janus Halleløv Wesenberg
Download or read book Quantum Information Processing in Rare-earth-ion Doped Crystals written by Janus Halleløv Wesenberg and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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
