arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0811.4449cond-mat.mes-hallcond-mat.supr-con
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超导微波腔的快速调谐

Fast tuning of superconducting microwave cavities

M. Sandberg, C. M. Wilson, F. Persson, G. Johansson, V. Shumeiko, T. Bauch, T. Duty, P. Delsing

摘要:

光子是电磁场的基本激发,可以在腔中捕获。对于具有特定尺寸的给定腔,基模具有固定的频率{ \it f},其赋予光子特定的“颜色”。该腔还具有典型的寿命$τ$,这导致有限线宽$δ$ { \it f}。如果腔的尺寸与$τ$相比变化得快,并且使得频率改变$Δ$ { \it f} $\gg δ$ { \it f},则可以改变捕获光子的“颜色”。在这里,我们展示超导微波腔,可调的有效长度。通过改变腔体一端的约瑟夫森电感来实现调谐。我们显示了四个不同的样品上的数据,并演示了数百线宽的时间$Δt \ll τ$调谐。在少光子极限下,我们证明了储存在腔中的光子在失谐后将从具有新频率的腔中泄漏出来。被测器件的特性使其适用于不同的应用,如量子比特的动态耦合和参量放大。

英文摘要:

Photons are fundamental excitations of the electromagnetic field and can be captured in cavities. For a given cavity with a certain size, the fundamental mode has a fixed frequency {\it f} which gives the photons a specific "color". The cavity also has a typical lifetime $τ$, which results in a finite linewidth $δ${\it f}. If the size of the cavity is changed fast compared to $τ$, and so that the frequency change $Δ${\it f} $\gg δ${\it f}, then it is possible to change the "color" of the captured photons. Here we demonstrate superconducting microwave cavities, with tunable effective lengths. The tuning is obtained by varying a Josephson inductance at one end of the cavity. We show data on four different samples and demonstrate tuning by several hundred linewidths in a time $Δt \ll τ$. Working in the few photon limit, we show that photons stored in the cavity at one frequency will leak out from the cavity with the new frequency after the detuning. The characteristics of the measured devices make them suitable for different applications such as dynamic coupling of qubits and parametric amplification.

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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