Dissipative stabilization of squeezing beyond 3 dB in a microwave mode
Abstract
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 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 dB. Moreover, this level of squeezing is achieved with a purity of dB.
Cite
@article{arxiv.2102.02863,
title = {Dissipative stabilization of squeezing beyond 3 dB in a microwave mode},
author = {R. Dassonneville and R. Assouly and T. Peronnin and A. A. Clerk and A. Bienfait and B. Huard},
journal= {arXiv preprint arXiv:2102.02863},
year = {2021}
}