Open AccessImproving macroscopic entanglement with nonlocal mechanical squeezing
Author(s) -
ChangSheng Hu,
Xinyu Lin,
Li-Tuo Shen,
Wan-Jun Su,
Yun-Kun Jiang,
HuaiZhi Wu,
ShiBiao Zheng
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.379058
Subject(s) - quantum entanglement , physics , sideband , optomechanics , dissipation , optics , quantum mechanics , quantum , microwave
We report an efficient mechanism to generate mechanical entanglement in a two-cascaded cavity optomechanical system with optical parametric amplifiers (OPAs) inside the two coupled cavities. We use the especially tuned OPAs to squeeze the hybrid mode composed of two mechanical modes, leading to strong macroscopic entanglement between the two movable mirrors. The squeezing parameter as well as the effective mechanical damping are both modulated by the OPA gains. The optimal degree of mechanical entanglement therefore depends on the balanced process between coherent hybrid mode squeezing and dissipation engineering. The mechanical entanglement is robust to strong cavity decay, going beyond simply resolved sideband regime, and is resistant to reasonable high thermal noise. The scheme provides an alternative way for generating strong macroscopic entanglement in cascaded optomechanical systems.