Coherent storage of microwave excitations in rare-earth nuclear spins

Interfacing between various elements of a computer--from memory to processors to long range communication--will be as critical for quantum computers as it is for classical computers today. Paramagnetic rare-earth doped crystals, such as Nd(3+):Y2SiO5(YSO), are excellent candidates for such a quantum...

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Veröffentlicht in:Physical review letters 2015-05, Vol.114 (17), p.170503-170503, Article 170503
Hauptverfasser: Wolfowicz, Gary, Maier-Flaig, Hannes, Marino, Robert, Ferrier, Alban, Vezin, Hervé, Morton, John J L, Goldner, Philippe
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container_end_page 170503
container_issue 17
container_start_page 170503
container_title Physical review letters
container_volume 114
creator Wolfowicz, Gary
Maier-Flaig, Hannes
Marino, Robert
Ferrier, Alban
Vezin, Hervé
Morton, John J L
Goldner, Philippe
description Interfacing between various elements of a computer--from memory to processors to long range communication--will be as critical for quantum computers as it is for classical computers today. Paramagnetic rare-earth doped crystals, such as Nd(3+):Y2SiO5(YSO), are excellent candidates for such a quantum interface: they are known to exhibit long optical coherence lifetimes (for communication via optical photons), possess a nuclear spin (memory), and have in addition an electron spin that can offer hybrid coupling with superconducting qubits (processing). Here we study two of these three elements, demonstrating coherent storage and retrieval between electron and (145)Nd nuclear spin states in Nd(3+):YSO. We find nuclear spin coherence times can reach 9 ms at ∼5  K, about 2 orders of magnitude longer than the electron spin coherence, while quantum state and process tomography of the storage or retrieval operation between the electron and nuclear spin reveal an average state fidelity of 0.86. The times and fidelities are expected to further improve at lower temperatures and with more homogeneous radio-frequency excitation.
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source American Physical Society Journals
subjects Chemical Sciences
Coherence
Electron spin
Excitation
Microwaves
Nuclear spin
or physical chemistry
Qubits (quantum computing)
Rare earth metals
Retrieval
Theoretical and
title Coherent storage of microwave excitations in rare-earth nuclear spins
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