通过低频噪声相关探测持续拉比振荡
Persistent Rabi oscillations probed via low-frequency noise correlation
摘要：
如果在弱耦合状态下连续监测量子位，则量子位拉比振荡已知是非衰减的（尽管具有波动相位）。在本文中，我们提出了一个实验来证明这些持续拉比振荡通过低频噪声相关。这个想法是通过两个探测器来测量一个量子比特，在拉比频率上偏置频闪。低频噪声取决于偏置脉冲的两个梳齿之间的相对相位，对于同相梳齿或反相梳齿，两个检测器中的电报噪声都强烈增加。这是因为持续拉比振荡和测量脉冲之间的自同步。几乎完美的相关性的噪声在两个检测器的同相政权和几乎完美的反相政权的关系表明存在同步的持续拉比振荡。实验可以用半导体或超导体量子比特来实现。
英文摘要：
The qubit Rabi oscillations are known to be non-decaying (though with a fluctuating phase) if the qubit is continuously monitored in the weak-coupling regime. In this paper we propose an experiment to demonstrate these persistent Rabi oscillations via low-frequency noise correlation. The idea is to measure a qubit by two detectors, biased stroboscopically at the Rabi frequency. The low-frequency noise depends on the relative phase between the two combs of biasing pulses, with a strong increase of telegraph noise in both detectors for the in-phase or anti-phase combs. This happens because of self-synchronization between the persistent Rabi oscillations and measurement pulses. Almost perfect correlation of the noise in the two detectors for the in-phase regime and almost perfect anticorrelation for the anti-phase regime indicates a presence of synchronized persistent Rabi oscillations. The experiment can be realized with semiconductor or superconductor qubits.
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