科研之友
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摘要
We demonstrate a scheme for realizing quantum-information storage (retrieval) into (from) a quantum memory using a hybrid quantum system, which consists of N nitrogen-vacancy (N-V) centers (asmemory), N transmission line resonators (TLRs) (as data bus), and N current-biased Josephson-junction (CBJJ) superconducting phase qubits (as heads of read and write). By virtually exciting the vibrational modes of the TLRs, this can produce an effective coupling between the N-V centers and the CBJJs in the system. Because the operation time (similar to 10(-8)s) is much shorter than the decoherence time of the CBJJ (similar to 10(-5) s), the quantum information can be transferred between the N-V centers and the CBJJs easily. Owing to the strong-coupling condition [lambda/2 pi >> (gamma(eg), Gamma,gamma(phi))] and the long coherence time (similar to 10(-3) s) of the N-V centers, the quantum information can be stored in the memory steadily, and it can be retrieved with a high fidelity (>96%). This scheme provides a scalable way of exchanging quantum information between different quantum interfaces, and has the experimental feasibility with currently available experimental technology.
