NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan and Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
Phys Rev Lett. 2013 Sep 6;111(10):107008. doi: 10.1103/PhysRevLett.111.107008. Epub 2013 Sep 5.
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.
我们构建了一个混合系统，该系统由超导磁通量子比特（处理器）和钻石中的氮空位中心（内存）组成，它们可以直接耦合在一起，并演示了如何将信息从磁通量子比特传输到内存、存储并随后检索。我们已经确定了内存的相干性质，并成功地在处理器和内存之间创建了纠缠态，证明了纠缠态的相干性是如何保持的。我们的研究结果是朝着使用电子自旋集合作为超导量子比特的量子内存迈出的重要一步。
