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arXiv 1401.5545quant-ph
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微波驱动下的Purcell效应:量子比特弛豫速率的抑制

Purcell effect with microwave drive: Suppression of qubit relaxation rate

Eyob A. Sete, Jay M. Gambetta, Alexander N. Korotkov

摘要:

我们分析了耦合到谐振器的超导量子比特的Purcell弛豫速率,该谐振器耦合到传输线并由外部微波驱动器泵浦。考虑到量子比特测量的典型机制,我们专注于量子比特频率与谐振器频率显著失谐的情况。令人惊讶的是,当微波驱动的强度增加时,Purcell速率降低。这种抑制在非线性区域变得显著。在存在微波驱动的情况下,光子到传输线的损失也会导致量子比特的激发;然而,激发速率通常远小于弛豫速率。我们的分析也适用于一个更一般的情况下,一个两能级量子系统耦合到一个腔。

英文摘要:

We analyze the Purcell relaxation rate of a superconducting qubit coupled to a resonator, which is coupled to a transmission line and pumped by an external microwave drive. Considering the typical regime of the qubit measurement, we focus on the case when the qubit frequency is significantly detuned from the resonator frequency. Surprisingly, the Purcell rate decreases when the strength of the microwave drive is increased. This suppression becomes significant in the nonlinear regime. In the presence of the microwave drive, the loss of photons to the transmission line also causes excitation of the qubit; however, the excitation rate is typically much smaller than the relaxation rate. Our analysis also applies to a more general case of a two-level quantum system coupled to a cavity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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