标题： 通过电路量子电动力学辅助的微波光子通用量子门 显示英文标题

标题： Universal quantum gates on microwave photons assisted by circuit quantum electrodynamics

摘要： 基于一个由两个耦合到一个transmon三能级量子比特的超导谐振器组成的微波光子量子处理器，我们通过第一个谐振器对transmon三能级量子比特的光子数依赖频率偏移效应与三能级量子比特和第二个谐振器之间的共振操作相结合，在微波光子谐振器高维量子比特上构建了受控相位(c-phase)门。这一独特特性为我们提供了一种有效的方法，在更高的保真度和更短的操作时间下实现两个谐振器高维量子比特上的c-phase门，相比之前的提议具有优势。我们的c-phase门保真度可在93 ns内达到99.51%。此外，我们的器件可以很容易地扩展以在三个谐振器高维量子比特上构建三量子比特门，这与现有的提议大不相同。我们借助一个transmon三能级量子比特在三个谐振器高维量子比特上完成的受控-受控相位门，其保真度可在124.64 ns内达到92.92%。 显示英文摘要

摘要： Based on a microwave-photon quantum processor with two superconducting resonators coupled to one transmon qutrit, we construct the controlled-phase (c-phase) gate on microwave-photon-resonator qudits, by combination of the photon-number-dependent frequency-shift effect on the transmon qutrit by the first resonator and the resonant operation between the qutrit and the second resonator. This distinct feature provides us a useful way to achieve the c-phase gate on the two resonator qudits with a higher fidelity and a shorter operation time, compared with the previous proposals. The fidelity of our c-phase gate can reach 99.51% within 93 ns. Moreover, our device can be extended easily to construct the three-qudit gates on three resonator qudits, far different from the existing proposals. Our controlled-controlled-phase gate on three resonator qudits is accomplished with the assistance of a transmon qutrit and its fidelity can reach 92.92% within 124.64 ns.