Quantum state sensitivity of an autoresonant superconducting circuit
Quantum state sensitivity of an autoresonant superconducting circuit
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DOI：
10.1103/physrevb.86.220503
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发表时间：
2012-12-07
影响因子：
3.7
通讯作者：
Siddiqi, I.
中科院分区：
文献类型：
--
作者：
Murch, K. W.;Ginossar, E.;Siddiqi, I.
当一个频率啁啾激励施加到一个经典的高Q值非线性振荡器，它的运动变得动态同步的驱动器和大的振荡幅度被观察到，提供的驱动强度超过自共振的临界阈值。我们证明，当这样的振荡器是强耦合到一个量子化的超导量子比特，有效的非线性和阈值成为一个非平凡的函数的量子比特振荡器失谐。此外，自谐振阈值取决于量子位的量子态，并且可以用于实现高保真度的锁存读出，其速度不受振荡器Q的限制。
When a frequency chirped excitation is applied to a classical high-Q nonlinear oscillator, its motion becomes dynamically synchronized to the drive and large oscillation amplitude is observed, provided the drive strength exceeds the critical threshold for autoresonance. We demonstrate that when such an oscillator is strongly coupled to a quantized superconducting qubit, both the effective nonlinearity and the threshold become a nontrivial function of the qubit-oscillator detuning. Moreover, the autoresonant threshold is dependent on the quantum state of the qubit and may be used to realize a high-fidelity, latching readout whose speed is not limited by the oscillator Q.