论文标题
一对超导码头的可调定向光子散射
Tunable directional photon scattering from a pair of superconducting qubits
论文作者
论文摘要
控制集成设备中散射光方向方向的能力对于为广泛的片上应用（例如集成光子学，量子信息处理和非线性光学元件）提供灵活性和可伸缩性至关重要。在光学和微波频率中，可以通过应用外部磁场来实现可调方向性，该磁场通过使用非线性效应或与振动的相互作用来修改光学选择规则。但是，这些方法不太适合控制集成超导量子设备内部微波光子的传播，这是非常可取的。在这里，我们演示了可调方向散射，仅两个基于定期调制的过渡频率的传输线耦合到传输线。通过更改由局部调制色调之间的相对相控制的调制的对称性，我们实现了方向向前或向后光子散射。
The ability to control the direction of scattered light in integrated devices is crucial to provide the flexibility and scalability for a wide range of on-chip applications, such as integrated photonics, quantum information processing and nonlinear optics. In the optical and microwave frequency ranges tunable directionality can be achieved by applying external magnetic fields, that modify optical selection rules, by using nonlinear effects, or interactions with vibrations. However, these approaches are less suitable to control propagation of microwave photons inside integrated superconducting quantum devices, that is highly desirable. Here, we demonstrate tunable directional scattering with just two transmon qubits coupled to a transmission line based on periodically modulated transition frequency. By changing the symmetry of the modulation, governed by the relative phase between the local modulation tones, we achieve directional forward or backward photon scattering.
