嵌入工程电磁环境的量子位控制单光子开关
Single-photon switch controlled by a qubit embedded in an engineered electromagnetic environment
摘要：
单光子开关是构建可扩展量子网络的重要元件。在本文中，我们提出了一个可行的方案，有效的单光子开关。所提出的开关由耦合到谐振器的三能级系统（qutrit）的最低能级对形成的量子比特的状态控制。该谐振器-谐振器系统包括所考虑的设置的开关单元。为了抑制控制量子位的Purcell弛豫，开关单元被嵌入到耦合谐振器阵列中，该耦合谐振器阵列用作在量子位跃迁频率上具有带隙的工程电磁环境。我们讨论了微波电路QED架构上考虑单光子开关的可能实现。我们表明，高开关对比度可以达到最先进的超导电路QED设置的参数。
英文摘要：
A single-photon switch is an important element for the building of scalable quantum networks. In this paper, we propose a feasible scheme for efficient single-photon switching. The proposed switch is controlled by a state of a qubit formed by the pair of the lowest levels of a three-level system (qutrit) coupled to a resonator. This resonator-qutrit system comprises a switching unit of the considered setup. For suppression of the Purcell relaxation of the control qubit, the switching unit is embedded into a coupled-resonator array serving as an engineered electromagnetic environment with a band gap on a qubit transition frequency. We discuss the possible implementation of the considered single-photon switch on the microwave circuit QED architecture. We demonstrate that high switching contrasts can be attained for the parameters achievable for the state-of-the-art superconducting circuit QED setups.
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