Single-nitrogen-vacancy-center quantum memory for a superconducting flux qubit mediated by a ferromagnet

Yen Yu Lai, Guin Dar Lin, Jason Twamley, Hsi Sheng Goan

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14 Citations (Scopus)
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We propose a quantum memory scheme to transfer and store the quantum state of a superconducting flux qubit (FQ) into the electron spin of a single nitrogen-vacancy (NV) center in diamond via yttrium iron garnet (YIG), a ferromagnet. Unlike an ensemble of NV centers, the YIG moderator can enhance the effective FQ-NV-center coupling strength without introducing additional appreciable decoherence. We derive the effective interaction between the FQ and the NV center by tracing out the degrees of freedom of the collective mode of the YIG spins. We demonstrate the transfer, storage, and retrieval procedures, taking into account the effects of spontaneous decay and pure dephasing. Using realistic experimental parameters for the FQ, NV center and YIG, we find that a combined transfer, storage, and retrieval fidelity higher than 0.9, with a long storage time of 10 ms, can be achieved. This hybrid system not only acts as a promising quantum memory, but also provides an example of enhanced coupling between various systems through collective degrees of freedom.

Original languageEnglish
Article number052303
Pages (from-to)1-10
Number of pages10
JournalPhysical Review A
Issue number5
Publication statusPublished - 2 May 2018

Bibliographical note

Copyright 2018 American Physical Society. Firstly published in Physical Review A, 97, 052303. The original publication is available at Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


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