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arXiv 0808.1979cond-mat.mes-hallcond-mat.mtrl-sciquant-ph
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单层石墨烯中的$π$结量子比特

$π$-junction qubit in monolayer graphene

Colin Benjamin, Jiannis K. Pachos

摘要:

我们建议将石墨烯的优点,如易调谐性和长相干时间,与约瑟夫森物理相结合来制造量子比特。如果这些量子位围绕0和$π$结构建,则它们可以由外部通量控制。或者,d波约瑟夫森结本身可以通过栅极电压进行调谐,以在宏观简并态之间产生叠加。我们表明,铁磁体是不需要实现$π$结在石墨烯,从而大大简化了其物理实现。我们演示了如何一个量子比特门,如任意相位旋转和交换门,可以实现。

英文摘要:

We propose to combine the advantages of graphene, such as easy tunability and long coherence times, with Josephson physics to manufacture qubits. If these qubits are built around a 0 and $π$ junction they can be controlled by an external flux. Alternatively, a d-wave Josephson junction can itself be tuned via a gate voltage to create superpositions between macroscopically degenerate states. We show that ferromagnets are not required for realizing $π$ junction in graphene, thus considerably simplifying its physical implementation. We demonstrate how one qubit gates, such as arbitrary phase rotations and the exchange gate, can be implemented.

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。

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