Fast Quantum Nondemolition Readout by Parametric Modulation of Longitudinal Qubit-Oscillator Interaction
Fast Quantum Nondemolition Readout by Parametric Modulation of Longitudinal Qubit-Oscillator Interaction
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DOI：
10.1103/physrevlett.115.203601
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发表时间：
2015-11-09
影响因子：
8.6
通讯作者：
Blais, Alexandre
中科院分区：
文献类型：
--
作者：
Didier, Nicolas;Bourassa, Jerome;Blais, Alexandre
我们展示了如何利用量子比特与振子的纵向相互作用实现快速、高保真的量子非破坏量子比特读出。这是通过在腔频率处调制纵向耦合来实现的。量子比特-振荡器的相互作用则充当腔上量子比特态相关的驱动力，这一情况与标准色散情况根本不同。可以利用单模压缩来指数地提高该读出协议的信噪比。我们提出了在电路量子电动力学中实现这种纵向参数读出的方法和一个可能的多量子比特结构。
We show how to realize fast and high-fidelity quantum nondemolition qubit readout using longitudinal qubit-oscillator interaction. This is accomplished by modulating the longitudinal coupling at the cavity frequency. The qubit-oscillator interaction then acts as a qubit-state dependent drive on the cavity, a situation that is fundamentally different from the standard dispersive case. Single-mode squeezing can be exploited to exponentially increase the signal-to-noise ratio of this readout protocol. We present an implementation of this longitudinal parametric readout in circuit quantum electrodynamics and a possible multiqubit architecture.