Cavity State Manipulation Using Photon-Number Selective Phase Gates
Cavity State Manipulation Using Photon-Number Selective Phase Gates
复制标题
DOI：
10.1103/physrevlett.115.137002
复制
发表时间：
2015-09-22
影响因子：
8.6
通讯作者：
Schoelkopf, Robert J.
中科院分区：
文献类型：
--
作者：
Heeres, Reinier W.;Vlastakis, Brian;Schoelkopf, Robert J.
巨大的可用希尔伯特空间和腔谐振器的高相干性使这些系统成为存储编码量子比特的有趣资源。然而，为了对这种编码信息执行量子门，必须同时对振荡器的许多级别应用复杂的非线性操作。在这项工作中，我们介绍了选择性的数量相关的任意相位（SNAP）门，它赋予一个不同的相位使用非共振耦合量子比特的每个福克态组件。我们表明，SNAP门允许控制的量子相位校正不必要的相位演化由于克尔效应。此外，通过将SNAP门与振子位移相结合，我们获得了高保真度的单光子Fock态。仅仅使用这两个控件，就可以构建任意的酉操作，为在编码器编码的量子位上执行逻辑操作提供了一条可扩展的路径。
The large available Hilbert space and high coherence of cavity resonators make these systems an interesting resource for storing encoded quantum bits. To perform a quantum gate on this encoded information, however, complex nonlinear operations must be applied to the many levels of the oscillator simultaneously. In this work, we introduce the selective number-dependent arbitrary phase (SNAP) gate, which imparts a different phase to each Fock-state component using an off-resonantly coupled qubit. We show that the SNAP gate allows control over the quantum phases by correcting the unwanted phase evolution due to the Kerr effect. Furthermore, by combining the SNAP gate with oscillator displacements, we create a one-photon Fock state with high fidelity. Using just these two controls, one can construct arbitrary unitary operations, offering a scalable route to performing logical manipulations on oscillator-encoded qubits.