论文标题
由嵌入在工程电磁环境中的值控制的单光子开关
Single-photon switch controlled by a qubit embedded in an engineered electromagnetic environment
论文作者
论文摘要
单光子开关是构建可扩展量子网络的重要元素。在本文中，我们提出了一个可行的方案，用于有效的单光子切换。所提出的开关由由与谐振器耦合的三级系统（QUTRIT）的最低级别形成的量子状态控制。此谐振器-Qutrit系统包括考虑设置的开关单元。为了抑制控制量子队的purcell松弛，切换单元嵌入到一个耦合的谐振器阵列中，该阵列用作工程的电磁环境，并在Qubit Transition Transition频率上带有带隙。我们讨论了微波电路QED体系结构上考虑的单光子开关的可能实现。我们证明，对于最先进的超导电路QED设置可实现的参数，可以实现高开关对比度。
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.
