Spin Amplification in an Inhomogeneous System

DOI DOI Web Site 被引用文献1件 参考文献27件 オープンアクセス
  • Suguru Endo
    Graduate School of Fundamental Science and Technology, Keio University, Yokohama 223-8522, Japan
  • Yuichiro Matsuzaki
    NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
  • William J. Munro
    NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
  • Tatsuhiko Koike
    Department of Physics and RECNS, Keio University, Yokohama 223-8522, Japan
  • Shiro Saito
    NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan

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説明

A long-lived qubit is usually well-isolated from all other systems and the environments, and so is not easy to couple with measurement apparatus. It is sometimes difficult to implement reliable projective measurements on such a qubit. One potential solution is spin amplification with many ancillary qubits. Here, we propose a spin amplification technique, where the ancillary qubits state change depending on the state of the target qubit. The technique works even in the presence of inhomogeneous broadening. We show that fast and accurate amplification is possible even if the coupling and frequency of the ancillary qubits is inhomogeneous. Since our scheme is robust against realistic imperfections, this could provide a new mechanism for reading out a single spin that could not have been measured using the previous approaches.

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