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

Yen-Yu Lai, Guin-Dar Lin, Jason Twamley, and Hsi-Sheng Goan
Phys. Rev. A 97, 052303 – Published 2 May 2018

Abstract

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 18 November 2017
  • Revised 24 February 2018

DOI:https://doi.org/10.1103/PhysRevA.97.052303

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Quantum Information, Science & Technology

Authors & Affiliations

Yen-Yu Lai1,2, Guin-Dar Lin1,2, Jason Twamley3, and Hsi-Sheng Goan1,2,*

  • 1Department of Physics and Center for Theoretical Physics, National Taiwan University, Taipei 10617, Taiwan
  • 2Center for Quantum Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
  • 3Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia

  • *goan@phys.ntu.edu.tw

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 97, Iss. 5 — May 2018

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×