Floquet state depletion in ac-driven circuit QED

腔QED材料中反常Floquet相的多体起源

Many-body origin of anomalous Floquet phases in cavity-QED materials

本研究探讨腔QED材料中反常Floquet拓扑相的多体起源，关联多体能谱与Floquet准能隙的拓扑相变，确立离散时间平移对称性的微观起源，联系孤立与周期驱动多体系统物理，并讨论拓扑不变量及体边对应关系。

Active resonator reset in the nonlinear dispersive regime of circuit QED

We present two pulse schemes for actively depleting measurement photons from a readout resonator in the nonlinear dispersive regime of circuit QED. One method uses digital feedback conditioned on the measurement outcome while the other is unconditional. In the absence of analytic forms and symmetries to exploit in this nonlinear regime, the depletion pulses are numerically optimized using the Powell method. We shorten the photon depletion time by more than six inverse resonator linewidths compared to passive depletion by waiting. We quantify the benefit by emulating an ancilla qubit performing…

拓扑反常Floquet光子泵

Topological anomalous Floquet photon pump

提出一个基于单量子比特的非绝热拓扑光子泵协议，通过驱动量子比特非线性实现拓扑相，并在腔Wigner分布函数中观测拓扑泵浦。

Boosting the Quantum State of a Cavity with Floquet Driving

The striking nonlinear effects exhibited by cavity QED systems make them a powerful tool in modern condensed matter and atomic physics. A recently discovered example is the quantized pumping of energy into a cavity by a strongly-coupled, periodically-driven spin. We uncover a remarkable feature of these energy pumps: they coherently translate, or boost, a quantum state of the cavity in the Fock basis. Current optical cavity and circuit QED experiments can realize the required Hamiltonian in a rotating frame. Boosting thus enables the preparation of highly-excited non-classical cavity states in…

利用静态耗散自主稳定傅科态

Autonomous Stabilization of Floquet States Using Static Dissipation

通过静态耗散实现傅科态的自主稳定，利用辅助腔体提高非经典态的制备保真度和光子电流

Engineering bilinear mode coupling in circuit QED: Theory and experiment

Photonic states of superconducting microwave cavities controlled by transmon ancillas provide a platform for encoding and manipulating quantum information. A key challenge in scaling up the platform is the requirement to communicate on demand the information between the cavities. It has been recently demonstrated that a tunable bilinear interaction between two cavities can be realized by coupling them to a bichromatically-driven transmon ancilla, which allows swapping and interfering the multi-photon states of the cavities [Gao et al., Phys. Rev. X 8, 021073(2018)]. Here, we explore both theor…