静态解耦的多量子比特腔QED系统中的强参数色散位移
Strong parametric dispersive shifts in a statically decoupled multi-qubit cavity QED system
AI总结：
本文提出在静态解耦的多量子比特腔QED系统中，通过参数驱动共享dc-SQUID实现量子比特与腔相互作用的独立动态调控，并演示了脉冲参数色散读出，为量子信息处理提供了新的可调框架。
摘要：
具有原位可调相互作用的腔量子电动力学（QED）对于开发用于量子模拟和计算的新型系统具有重要意义。调节腔QED系统色散位移的能力为执行量子测量或逻辑操作提供了更多功能。在此，我们通过一个共享的直流超导量子干涉装置（dc-SQUID）将两个transmon量子比特耦合到一个集总元件腔。我们的设计平衡了互电容和互电感电路元件，使得两个量子比特都与腔高度解耦，从而提供对退相干过程的保护。我们证明，通过用振荡磁通参数驱动SQUID，可以动态地独立调节任一量子比特与腔之间的相互作用。这种腔QED相互作用的强度和失谐可以通过选择参数泵浦频率和幅度来完全控制。作为实际演示，我们在两个量子比特与腔静态解耦的情况下，对它们进行了脉冲参数色散读出。腔模的色散频率位移符合基于简单理论所预期的幅度和符号，该简单理论得到了更深入理论研究的支持。这种参数方法创建了一个新的可调腔QED框架，用于开发具有多种未来应用的量子信息系统，例如通过多量子比特奇偶校验读出实现纠缠和纠错、态和纠缠稳定以及参数逻辑门。
英文摘要：
Cavity quantum electrodynamics (QED) with in-situ tunable interactions is important for developing novel systems for quantum simulation and computing. The ability to tune the dispersive shifts of a cavity QED system provides more functionality for performing either quantum measurements or logical manipulations. Here, we couple two transmon qubits to a lumped-element cavity through a shared dc-SQUID. Our design balances the mutual capacitive and inductive circuit components so that both qubits are highly decoupled from the cavity, offering protection from decoherence processes. We show that by parametrically driving the SQUID with an oscillating flux it is possible to independently tune the interactions between either of the qubits and the cavity dynamically. The strength and detuning of this cavity QED interaction can be fully controlled through the choice of the parametric pump frequency and amplitude. As a practical demonstration, we perform pulsed parametric dispersive readout of both qubits while statically decoupled from the cavity. The dispersive frequency shifts of the cavity mode follow the expected magnitude and sign based on simple theory that is supported by a more thorough theoretical investigation. This parametric approach creates a new tunable cavity QED framework for developing quantum information systems with various future applications, such as entanglement and error correction via multi-qubit parity readout, state and entanglement stabilization, and parametric logical gates.
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