Single-nitrogen-vacancy-center quantum memory for a superconducting flux qubit mediated by a ferromagnet
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-05-02 |
| Journal | Physical review. A/Physical review, A |
| Authors | Yen-Yu Lai, Guin-Dar Lin, Jason Twamley, HsiāSheng Goan |
| Institutions | Macquarie University, National Center for Theoretical Sciences |
| Citations | 28 |
Abstract
Section titled āAbstractāWe propose a quantum memory scheme to transfer and store the quantum state of\na superconducting flux qubit (FQ) into the electron spin of a single\nnitrogen-vacancy (NV) center in diamond via yttrium iron garnet (YIG), a\nferromagnet. Unlike an ensemble of NV centers, the YIG moderator can enhance\nthe effective FQ-NV-center coupling strength without introducing additional\nappreciable decoherence. We derive the effective interaction between the FQ and\nthe NV center by tracing out the degrees of freedom of the collective mode of\nthe YIG spins. We demonstrate the transfer, storage, and retrieval procedures,\ntaking into account the effects of spontaneous decay and pure dephasing. Using\nrealistic experimental parameters for the FQ, NV center and YIG, we find that a\ncombined transfer, storage, and retrieval fidelity higher than 0.9, with a long\nstorage time of 10 ms, can be achieved. This hybrid system not only acts as a\npromising quantum memory, but also provides an example of enhanced coupling\nbetween various systems through collective degrees of freedom.\n