arXiv 2102.028632021-02-08quant-ph

微波模中超过3 dB压缩的耗散稳定性

Dissipative stabilization of squeezing beyond 3 dB in a microwave mode

R. Dassonneville, R. Assouly, T. Peronnin, A. A. Clerk, A. Bienfait, B. Huard

发表信息：: PRX Quantum 2, 020323 (2021)
DOI：: 10.1103/PRXQuantum.2.020323

摘要：

虽然可以通过泵浦参量谐振器产生具有任意压缩的光的传播状态，但是谐振器内状态被限制为3dB的压缩。在这里，我们实现了一个水库工程方法，使用超导电路超过这个限制。三波混频元件的双音泵浦实现了与压缩浴的有效耦合，该压缩浴稳定了谐振器内的压缩状态。使用辅助超导量子位作为探针，使我们能够执行直接的维格纳层析成像的谐振器内的状态。原始测量提供了在零点电平以下约$6.7 \pm 0.2$ dB处的压缩的下限。此外，我们展示了如何在维格纳层析成像过程中校正谐振腔的演化，并获得高达$8.2 \pm 0.8$ dB的压缩。此外，这种压缩水平是以$-0.4 \pm 0.4$ dB的纯度实现的。

英文摘要：

While a propagating state of light can be generated with arbitrary squeezing by pumping a parametric resonator, the intra-resonator state is limited to 3 dB of squeezing. Here, we implement a reservoir engineering method to surpass this limit using superconducting circuits. Two-tone pumping of a three-wave-mixing element implements an effective coupling to a squeezed bath which stabilizes a squeezed state inside the resonator. Using an ancillary superconducting qubit as a probe allows us to perform a direct Wigner tomography of the intra-resonator state. The raw measurement provides a lower bound on the squeezing at about $6.7 \pm 0.2$ dB below the zero-point level. Further, we show how to correct for resonator evolution during the Wigner tomography and obtain a squeezing as high as $8.2 \pm 0.8$ dB. Moreover, this level of squeezing is achieved with a purity of $-0.4 \pm 0.4$ dB.

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英文摘要：

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