A Degenerate Parametric Quantum Optical Amplifier

R. Neumann, H. Haug

Radim Filip, Jan Peřina

Y. Y. 彦云 Yang 杨, H. B. Liu, Gangcheng Wang +2 more

We investigate a nonreciprocal quantum battery in which the charger and battery share one or two common reservoirs, with the charger driven by a degenerate optical parametric amplifier (DOPA). Reservoir-mediated dissipative interactions enable directional energy transfer, while the DOPA provides additional parametric am plification. We show that, in the stable below-threshold regime, the DOPA can enhance the battery energy and average charging power, with the nonlinear gain and pump phase providing effective control of the charging dynamics. Further optimization of the dissipative-coupling asymmetry improves the stored energy. These fea tures persist for both single- and two-common-reservoir configurations, demonstrating a tunable strategy for enhancing open-system quantum-battery charging.

M. K. Olsen, Lev I. Plimak, Antonio Zelaquett Khoury

Wenyao Hu, H. N. Liu, X. C. Zhang +3 more

ABSTRACT Quantum entanglement in molecular cavity optomechanical (COM) systems serves as a fundamental resource to explore quantum‐enhanced sensing, coherent molecular dynamics, and quantum information processing, which has been studied under Markovian approximation but not yet explored in non‐Markovian reservoirs. In this paper, we propose a scheme to manipulate quantum entanglement in molecular COM system coupled with a degenerate optical parametric amplifier (DOPA) under Markovian approximation. We reveal that both strength and phase of DOPA can be tuned to enhance optical‐vibration entanglement and suppress vibration‐vibration entanglement. The optical‐vibration entanglement can exist at room temperature, demonstrating strong robustness against thermal noise. Moreover, we extend results from Markovian to non‐Markovian regimes, which can further enhance both types of entanglement with DOPA fixed. In particular, we find that non‐Markovian effects can reverse influences of DOPA on vibration‐vibration entanglement from suppression to enhancement, leading to regeneration of entanglement. The scheme provides an effective way to control and enhance quantum entanglement in a molecular COM system through steering DOPA and non‐Markovian effects.