arXiv 0709.23412007-09-14cond-mat.mes-hallcond-mat.supr-con

通过谐振腔实现两个相位量子比特之间的相干量子态存储和传输

Coherent quantum state storage and transfer between two phase qubits via a resonant cavity

Mika A. Sillanpaa, Jae I. Park, Raymond W. Simmonds

备注：: 17 pages, 4 figures (to appear in Nature)
DOI：: 10.1038/nature06124

摘要：

一个量子力学系统的网络显示其量子态的长寿命相位相干性，可以用于处理量子信息。与经典信息处理一样，量子处理器需要可以独立寻址和读出的信息位（量子位），存储任意量子态的长期存储器元件，以及通过大量量子位可访问的相干通信总线传输量子信息的能力。利用可扩展的微加工技术制备的超导量子比特是实现大规模量子信息处理器的一个有希望的候选者。尽管这些系统已经成功地通过了多达四个量子比特的相干耦合测试，但是量子比特之间通过量子总线的单个量子态的通信尚未得到证实。在这里，我们进行了一个实验，展示了通过由长度为7 mm的单个片上超导传输线谐振腔形成的基本量子总线在两个超导约瑟夫森相位量子比特之间相干传输量子态的能力。在用第一个量子比特制备初始量子态之后，该量子信息被传输并存储为谐振腔的非经典光子态，然后在稍后的时间由连接到腔的相对端的第二量子比特取回。除了简单的通信，这些结果表明，一个高品质因数超导腔也可以作为一个长期的记忆元件。这里提出的基本架构是可扩展的，为大量超导量子比特之间的相干通信提供了可能性。

英文摘要：

A network of quantum-mechanical systems showing long lived phase coherence of its quantum states could be used for processing quantum information. As with classical information processing, a quantum processor requires information bits (qubits) that can be independently addressed and read out, long-term memory elements to store arbitrary quantum states, and the ability to transfer quantum information through a coherent communication bus accessible to a large number of qubits. Superconducting qubits made with scalable microfabrication techniques are a promising candidate for the realization of a large scale quantum information processor. Although these systems have successfully passed tests of coherent coupling for up to four qubits, communication of individual quantum states between qubits via a quantum bus has not yet been demonstrated. Here, we perform an experiment demonstrating the ability to coherently transfer quantum states between two superconducting Josephson phase qubits through a rudimentary quantum bus formed by a single, on chip, superconducting transmission line resonant cavity of length 7 mm. After preparing an initial quantum state with the first qubit, this quantum information is transferred and stored as a nonclassical photon state of the resonant cavity, then retrieved at a later time by the second qubit connected to the opposite end of the cavity. Beyond simple communication, these results suggest that a high quality factor superconducting cavity could also function as a long term memory element. The basic architecture presented here is scalable, offering the possibility for the coherent communication between a large number of superconducting qubits.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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