Micro- and nanoscale optical or microwave cavities are used in a wide range of classical applications and quantum science experiments, ranging from precision measurements, laser technologies to quantum control of mechanical motion. The dissipative photon loss via absorption, present to some extent in any optical cavity, is known to introduce thermo-optical effects and thereby impose fundamental limits on precision measurements. Here, we theoretically and experimentally reveal that such dissipative photon absorption can result in quantum feedback via in-loop field detection of the absorbed optical field, leading to the intracavity field fluctuations to be squashed or antisquashed. Strikingly, this modifies the optical cavity susceptibility in coherent response measurements and causes excess noise and correlations in incoherent interferometric optomechanical measurements using a cavity. We experimentally observe such unanticipated dissipative dynamics in optomechanical spectroscopy of sideband-cooled optomechanical crystal cavitiess at both cryogenic temperature (approximately 8 K) and ambient conditions. The dissipative feedback introduces effective modifications to the optical cavity linewidth and the optomechanical scattering rate and gives rise to excess imprecision noise in the interferometric quantum measurement of mechanical motion. Such dissipative feedback differs fundamentally from a quantum nondemolition feedback, e.g., optical Kerr squeezing. The dissipative feedback itself always results in an antisqueezed out-of-loop optical field, while it can enhance the coexisting Kerr squeezing under certain conditions. Our result has wide-ranging implications for future dissipation engineering, such as dissipation enhanced sideband cooling and Kerr squeezing, quantum frequency conversion, and nonreciprocity in photonic systems.
Role of Dissipation on the Stability of a Parametrically Driven Quantum Harmonic Oscillator
采用有效哈密顿方法研究了单量子谐振子在参量驱动下的耗散动力学。利用Liouville von Neumann方法，我们证明了参数驱动耗散量子振子的时间演化与经典阻尼Mathieu方程有很强的联系。基于对Monodromy矩阵的数值分析，我们证明了耗散效应可以减弱由参数驱动产生的动力学不稳定性。进一步，我们得到了Wigner函数的局部化与阻尼Mathieu方程的稳定性之间的密切关系。
Parametrically Driven Superradiance of an Interacting Tavis-Cummings Model
University of Science and Technology of China（中国科学技术大学）；Laboratory of Quantum Information, University of Science and Technology of China（中国科学技术大学量子信息实验室）；Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China（中国科学技术大学安徽省量子网络重点实验室）；CAS Center For Excellence in Quantum Information and Quantum Physics, Hefei 230026, China（中国科学院量子信息与量子物理卓越创新中心）；Hefei National Laboratory, University of Science and Technology of China（中国科学技术大学合肥国家实验室）；Anhui Center for Fundamental Sciences in Theoretical Physics, University of Science and Technology of China（中国科学技术大学安徽理论物理基础科学中心）
Spectroscopy on a single nonlinear mode recognizes quantum states
Majulab, International Joint Research Unit UMI 3654, CNRS, Université Côte d’Azur, Sorbonne Université, National University of Singapore, Nanyang Technological University（马朱实验室，国际联合研究单位UMI 3654，法国国家科学研究中心，蔚蓝海岸大学，索邦大学，新加坡国立大学，南洋理工大学）；Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-Université PSL, Collège de France（卡斯特尔布罗塞尔实验室，索邦大学，法国国家科学研究中心，巴黎高等师范学院-巴黎文理研究大学，法兰西公学院）；Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University（南洋理工大学理学院物理与应用物理系）；School of Mathematical and Physical Sciences, University of Sheffield（谢菲尔德大学数学与物理科学学院）；Center for Theoretical Physics, Polish Academy of Sciences（波兰科学院理论物理中心）
A Nonrecursive Lindblad Quantization of Dissipative Polynomial Dynamics
Hebei University（河北大学）；Hebei Key Laboratory of High-Precision Computation and Application of Quantum Field Theory（河北省量子场论高精度计算与应用重点实验室）；Hebei Research Center of the Basic Discipline for Computational Physics（河北省计算物理学基础学科研究中心）
