TY - JOUR
T1 - Single-nitrogen-vacancy-center quantum memory for a superconducting flux qubit mediated by a ferromagnet
AU - Lai, Yen Yu
AU - Lin, Guin Dar
AU - Twamley, Jason
AU - Goan, Hsi Sheng
N1 - Copyright 2018 American Physical Society. Firstly published in Physical Review A, 97, 052303. The original publication is available at https://doi.org/10.1103/PhysRevA.97.052303. 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.
PY - 2018/5/2
Y1 - 2018/5/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85046941935&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/CE1101013
U2 - 10.1103/PhysRevA.97.052303
DO - 10.1103/PhysRevA.97.052303
M3 - Article
AN - SCOPUS:85046941935
SN - 2469-9926
VL - 97
SP - 1
EP - 10
JO - Physical Review A
JF - Physical Review A
IS - 5
M1 - 052303
ER -