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Laser Physics Letters

Dynamics and enhancement of nonlinear coupling via squeezing a cavity mode

Yang Gu, Zhong-Ju Liu, Tong-Rui Cui, Chuan-Jie Liang, Jin Zhao, Yanan Zhang

Published May 1, 2025• 2 citations
Publisher

Abstract

Abstract We propose a scheme to enhance nonlinear coupling between a two-mode optical cavity via parametric squeezing. Employing a two-mode squeezed vacuum state, we derive an effective Hamiltonian that reveals enhancement of nonlinear coupling. Numerical simulations demonstrate that the enhanced squeezing will cause the oscillation between the two-mode photon numbers of the system. The dissipation of the system is also considered, that the dissipation has a positive effect on the preparation of steady state via parametric squeezing. The result in our investigation could provide an effective simulation platform for the realization of quantum information process.

DOI
10.1088/1612-202x/add4e9

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Abstract We propose a scheme to enhance nonlinear coupling between a two-mode optical cavity via parametric squeezing. Employing a two-mode squeezed vacuum state, we derive an effective Hamiltonian that reveals enhancement of nonlinear coupling. Numerical simulations demonstrate that the enhanced squeezing will cause the oscillation between the two-mode photon numbers of the system. The dissipation of the system is also considered, that the dissipation has a positive effect on the preparation of steady state via parametric squeezing. The result in our investigation could provide an effective simulation platform for the realization of quantum information process.
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We propose a theoretical method to enhance the coherent dipole coupling between two atoms in an optical cavity via parametrically squeezing the cavity mode. In the present scheme, conditions for coherent coupling are derived in detail and diverse dynamics of the system can be obtained by regulating system parameters. In the presence of environmental noise, an auxiliary squeezed field is employed to suppress and even completely eliminate the additional noise induced by squeezing. In addition, we demonstrate that our scheme enables the effective suppression of atomic spontaneous emission. The results in our investigation could be used for diverse applications in quantum technologies.
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We propose an experimentally feasible method for enhancing the atom-field coupling as well as the ratio between this coupling and dissipation (i.e., cooperativity) in an optical cavity. It exploits optical parametric amplification to exponentially enhance the atom-cavity interaction and, hence, the cooperativity of the system, with the squeezing-induced noise being completely eliminated. Consequently, the atom-cavity system can be driven from the weak-coupling regime to the strong-coupling regime for modest squeezing parameters, and even can achieve an effective cooperativity much larger than 100. Based on this, we further demonstrate the generation of steady-state nearly maximal quantum entanglement. The resulting entanglement infidelity (which quantifies the deviation of the actual state from a maximally entangled state) is exponentially smaller than the lower bound on the infidelities obtained in other dissipative entanglement preparations without applying squeezing. In principle, we can make an arbitrarily small infidelity. Our generic method for enhancing atom-cavity interaction and cooperativities can be implemented in a wide range of physical systems, and it can provide diverse applications for quantum information processing.
Abstract The realization of the strong coupling regime is requisite for implementing quantum information tasks. Here, a method for enhancing the atom–field coupling in highly dissipative coupled cavities is proposed. By introducing parametric squeezing into the primary cavity, which is only virtually excited under specific parametric conditions, coupling enhancement between the atom and the auxiliary cavity is realized for appropriate squeezing parameters. This enables the system to be robust against large cavity decay and atomic spontaneous emission. The observation of vacuum Rabi oscillations show that the originally weakly coupled system can be enhanced into an effective strong coupling regime.
We investigate the nonlinear interaction between a squeezed cavity mode and a mechanical mode in an optomechanical system (OMS) that allows us to selectively obtain either a radiation-pressure coupling or a parametric-amplification process. The squeezing of the cavity mode can enhance the interaction strength into the single-photon strong-coupling regime, even when the OMS is originally in the weak-coupling regime. Moreover, the noise of the squeezed mode can be suppressed completely by introducing a broadband-squeezed vacuum environment that is phase matched with the parametric amplification that squeezes the cavity mode. This proposal offers an alternative approach to control the OMS using a squeezed cavity mode, which should allow single-photon quantum processes to be implemented with currently available optomechanical technology. Potential applications range from engineering single-photon sources to nonclassical phonon states.