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Spin Dynamics In Rare Earth Ion Doped Crystals For Optical Quantum Memories
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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 Development of Persistent Quantum Memories by : Manjin Zhong
Download or read book Development of Persistent Quantum Memories written by Manjin Zhong and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the coherence properties of the hyperfine transitions of the 151Eu3+ ions in Eu3+:Y2SiO5 and evaluates the potential of developing quantum memories using these transitions. Quantum memories for light with long storage times are required for quantum commu- nication applications. For these memories to be useful they need to have storage times long compared to the transmission times across the communication network. For a global optical communication network this requires storage time longer than 100 ms. Rare-earth doped crystals have been identified as a suitable storage material. The storage time of these systems is limited by the coherence time of the hyperfine transitions of the optically active rare-earth ions. In previous work it had been demonstrated that coherence times as long as 1.4 seconds could be achieved for hyperfine transitions in Pr3+:Y2SiO5 by ap- plying a particular magnetic field such that the first order Zeeman shift of the transition nulled. This technique is known as zero first-order Zeeman (ZEFOZ). Due to the relatively large second order Zeeman efficient of the transitions in Pr3+:Y2SiO5, an extension of the coherence time, significantly beyond the 1.4 second mark using ZEFOZ, is not expected. However, it has been predicted that coherence times more than two orders of magnitude longer could be achieved in Eu3+:Y2SiO5 due to the smaller second order Zeeman shifts associated with the relevant hyperfine transitions. The dominant decoherence mechanism for the hyperfine transitions in diluted Eu3+:Y2SiO5 is the magnetic field perturbations caused by the random spin reconfigu- ration of the Y3+ ions in the host. By applying the ZEFOZ technique, previously used in Pr3+:Y2SiO5, the sensitivity of the transition's frequency to environmental magnetic field perturbations was significantly reduced. Further, this strong ZEFOZ magnetic field was also shown to induce a frozen core around the Eu3+ ion, which resulted in a signifi- cant suppression of the reconfiguration of the nearby Y3+ spins. The combined effect of the reduced sensitivity and frozen core effect allowed a decoherence rate of 8 × 10-5 s-1 over 100 milliseconds to be demonstrated. The observed decoherence rate is at least an order of magnitude lower than that of any other system suitable for an optical quantum memory. Furthermore, by employing dynamic decoherence control, a coherence time of 370 ± 60 minutes was achieved. This 6 hour coherence time observed here opens up the possibility of distributing quantum entanglement via the physical transport of memories as an alternative to optical communications. It was found that even at the critical point alignment the observed coherence times showed that the Y3+ spin flips remain the dominant decoherence mechanism. To aid in the development of future strategies to further extend the coherence time beyond 6 hours, a study of the Y3+ spin dynamics in the frozen core was conducted. Four of the Y3+ sites were resolved and a complete mapping of all frozen-core Y3+ sites was limited by the inhomogeneity of the applied magnetic field. The Rabi frequency, the coherence time and lifetime as well as the interaction strength with the Eu3+ ion of one of these Y3+ ions were measured. The observed lifetime of the Y3+ ion is 27 s, which is four orders of magnitude longer than the low field value. With the technique developed, a detailed understanding of the frozen-core dynamics is possible, which would allow an extension of the hyperfine coherence time of the Eu3+ ion towards the lifetime limit. In summary, this thesis provides a detailed characterisation of the decoherence mecha- nisms of the hyperfine transitions in Eu3+:Y2SiO5. The potential of using rare-earth doped crystals for the long-term storage of quantum information with applications to long-range quantum communications is identified. The demonstrated long coherence time of the quantum transitions for information storage allows a new way of entanglement distribu- tion: entanglement is transported by physically transporting the memory crystal rather than the light. This approach opens a new regime for both quantum communication and fundamental tests of quantum mechanics.
Book Synopsis Quantum Memory Development and New Slow Light Applications in Rare-earth-ion-doped Crystals by : Qian Li
Download or read book Quantum Memory Development and New Slow Light Applications in Rare-earth-ion-doped Crystals written by Qian Li and published by . This book was released on 2018 with total page 159 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 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 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 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 Hyperfine Characterisation and Enhanced Optical to Spin Storage in Rare Earth Ion Doped Crystals by : Marko Lovrić
Download or read book Hyperfine Characterisation and Enhanced Optical to Spin Storage in Rare Earth Ion Doped Crystals written by Marko Lovrić and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Efficient Quantum Memories Based on Spectral Engineering of Rare-earth-ion-doped Solids by : Mahmood Sabooni
Download or read book Efficient Quantum Memories Based on Spectral Engineering of Rare-earth-ion-doped Solids written by Mahmood Sabooni and published by . This book was released on 2013 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Towards Efficient Quantum Memories in Rare-earth-ion-doped Solids by : Atia Amari
Download or read book Towards Efficient Quantum Memories in Rare-earth-ion-doped Solids written by Atia Amari and published by . This book was released on 2010 with total page 151 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 Spin Dynamics in Rare Earth Doped Phosphate Glasses by : Goudemond Iain Patrick
Download or read book Spin Dynamics in Rare Earth Doped Phosphate Glasses written by Goudemond Iain Patrick and published by . This book was released on 1995 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 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 Growth and Coherent Spectroscopy of Europium- and Praseodymium-doped Crystals for Quantum Memory Applications by : Biagio Tumino
Download or read book Growth and Coherent Spectroscopy of Europium- and Praseodymium-doped Crystals for Quantum Memory Applications written by Biagio Tumino and published by . This book was released on 2013 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare-earth-doped solids are promising materials as light-matter interfaces for quantum applications. In particular, europium-doped yttrium orthosilicate crystal (Eu3+:Y2SiO5) shows coherence properties and a ground-state energy-level structure suitable for quantum memory applications. Within the european project QuRep, spectroscopic investigations of this material are reported in order to determine the optimal conditions (in terms of material's purity or ions concentration) for obtaining high performance quantum memories. Two crystal growth techniques (Czochralski and melting zone) are also used in order to refine the growth conditions for this material. The europium optical transition 7F0 - 5D0 is investigated by high resolution-absorption and photon echo techniques in order to study the absorption coefficient peak, the inhomogeneous linewidth and the optical coherence lifetime as function of different conditions. The hyperfine structure of the two europium isotopes (151Eu and 153Eu) is also analyzed by applying an external static magnetic field. Coherent Raman Scattering measurements are performed in order to measure the hyperfine coherence lifetime in 151/153Eu3+:Y2SiO5 found to be in the range of 10-20 ms at zero magnetic field.
Book Synopsis Spin-Photon Strong Coupling of a Diluted Spin Ensemble Using On-Chip Superconducting Resonators by : Giovanni Franco-Rivera
Download or read book Spin-Photon Strong Coupling of a Diluted Spin Ensemble Using On-Chip Superconducting Resonators written by Giovanni Franco-Rivera and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The properties of quantum spins diluted in non-magnetic crystals make them a promising candidatefor a quantum memory given their long coherence and relaxation times and their limited Hilbert space span by the electron and nuclear states of the spin Hamiltonian. In order to efficiently store and retrieve the quantum information from, let's say a superconducting qubit quantum processor, the coupling between systems is mediated by on-chip superconducting resonators that acts as a quantum bus. For this, a strong coupling between the spin quantum memory and electromagnetic mode of the superconducting resonator is needed. The results presented in this dissertation demonstrates the implementation of coupled photonic states of an on-chip superconducting resonator with a Gd3+ rare-earth ion hosted in a scheelite (CaWO4) crystal. Experiments probing the weakly coupled limit of the resonator mode with the electronuclear states of the 155,157Gd3+ isotopes diluted in CaWO4 crystal are shown. Highly sensitive field dependent cavity spectroscopy measurements showed the perturbation of the resonator properties, such as the cavity linewidth and resonance frequency. Information about the spin ensemble phase memory loss rate and coupling strength were obtained for the six observed resonances resulting from the hyperfine slitting of the Gd odd isotopes. Given the resonator microwave field distribution and carefully selecting the orientation of the static field relative crystallographic c-axis, we were able to detect highly forbidden electron spin resnonance (ESR) transitions. Additionaly, the strong coupling signal of the Gd3+ spin transition between the first and second excited state with the on-chip resonator mode is demonstrated. By analyzing the spectroscopic signal using the Dicke model that describes the interaction of photonic states with a large S spin the observed transitions were reproduced by numerical diagonalization of the spin-cavity Hamiltonian. Lastly the dynamics of the spin-cavity states were explored via pulsed ESR measurements by recording the cavity ring-down signal at different pulse lengths and drive powers. The presented results are only a first step into the exploration of the Gd3+ spin dynamics at millikelvin temperatures.