2018/04/30 by Yen-Yu Lai, Guin-Dar Lin, Jason Twamley +2
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Fiber Laser Technologies #Charge qubit #Condensed matter physics #Coupling (piping) #Degrees of freedom (physics and chemistry) #Dephasing #Diamond and Carbon-based Materials Research #Dynamical decoupling #Flux qubit #High-pressure geophysics and materials #Materials science #Nitrogen-vacancy center #Phase qubit #Physics #Quantum #Quantum decoherence #Quantum mechanics #Qubit #Spins #Yttrium iron garnet #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physreva.97.052303
published as Phys. Rev. A 97, 052303 (2018) · 11 pages, 4 figures (to appear in Phys. Rev. A)
arxiv created 2018/04/30 · openalex publication_date 2018/05/02 · arxiv updated 2018/05/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.