Towards Realizing a Quantum Memory for a Superconducting Qubit: Storage and Retrieval of Quantum States

Shiro Saito, Xiaobo Zhu, Robert Amsüss, Yuichiro Matsuzaki, Kosuke Kakuyanagi, Takaaki Shimo-Oka, Norikazu Mizuochi, Kae Nemoto, William J. Munro, and Kouichi Semba
Phys. Rev. Lett. 111, 107008 – Published 5 September 2013


We have built a hybrid system composed of a superconducting flux qubit (the processor) and an ensemble of nitrogen-vacancy centers in diamond (the memory) that can be directly coupled to one another, and demonstrated how information can be transferred from the flux qubit to the memory, stored, and subsequently retrieved. We have established the coherence properties of the memory and succeeded in creating an entangled state between the processor and memory, demonstrating how the entangled state’s coherence is preserved. Our results are a significant step towards using an electron spin ensemble as a quantum memory for superconducting qubits.

  • Figure
  • Figure
  • Figure
  • Received 13 May 2013


© 2013 American Physical Society

Authors & Affiliations

Shiro Saito1,*, Xiaobo Zhu1, Robert Amsüss1,2, Yuichiro Matsuzaki1, Kosuke Kakuyanagi1, Takaaki Shimo-Oka3, Norikazu Mizuochi3, Kae Nemoto4, William J. Munro1, and Kouichi Semba1,4

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • 2Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
  • 3Graduate School of Engineering Science, Osaka University, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
  • 4National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan

  • *

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Vol. 111, Iss. 10 — 6 September 2013

Reuse & Permissions
Access Options
Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

Authorization Required




Sign up to receive regular email alerts from Physical Review Letters

Log In



Article Lookup

Paste a citation or DOI

Enter a citation