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Physica Scripta

Effects of laser phase noise on optomechanical entanglement in the presence of a nonlinear Kerr downconverter

Rizwan Ahmed, Shahid Qamar

Published Mar 7, 2019• 5 citations
Publisher

Abstract

Abstract In this paper, we consider an optomechanical system with a Kerr downconversion element in the presence of pump laser phase noise (LPN). In particular, we study the effect of phase fluctuations on entanglement generation in the presence of a nonlinear Kerr downconverter. The steady-state entanglement spectrum depends upon the parametric gain and phase fluctuations associated with the driving field. Interestingly, our results show that optomechanical entanglement exists even for non-zero LPN. It has been shown that the presence of Kerr downconverter nonlinearity improves the robustness of the entanglement against the input LPN.

DOI
10.1088/1402-4896/ab0d99

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Abstract In this paper, we consider an optomechanical system with a Kerr downconversion element in the presence of pump laser phase noise (LPN). In particular, we study the effect of phase fluctuations on entanglement generation in the presence of a nonlinear Kerr downconverter. The steady-state entanglement spectrum depends upon the parametric gain and phase fluctuations associated with the driving field. Interestingly, our results show that optomechanical entanglement exists even for non-zero LPN. It has been shown that the presence of Kerr downconverter nonlinearity improves the robustness of the entanglement against the input LPN.
We study the effect of laser phase noise on the generation of stationary entanglement between an intracavity optical mode and a mechanical resonator in a generic cavity optomechanical system. We show that one can realize robust stationary optomechanical entanglement even in the presence of non-negligible laser phase noise. We also show that the explicit form of the laser phase noise spectrum is relevant, and discuss its effect on both optomechanical entanglement and ground-state cooling of the mechanical resonator.
We propose a scheme to suppress the laser phase noise without increasing the optomechanical single-photon coupling strength. In the scheme, the parametric amplification terms, created by Kerr and Duffing nonlinearities, can restrain laser phase noise and strengthen the effective optomechanical coupling, respectively. Interestingly, decreasing laser phase noise leads to increasing thermal noise, which is inhibited by bringing in a broadband-squeezed vacuum environment. To reflect the superiority of the scheme, we simulate quantum memory and stationary optomechanical entanglement as examples, and the corresponding numerical results demonstrate that the laser phase noise is extremely suppressed. Our method can pave the way for studying other quantum phenomena.
Cavity optomechanical systems are considered as one of the best platforms for studying macroscopic quantum phenomena. In this paper, we studied the effect of laser phase noise on the steady-state entanglement between a cavity mode and a rotating mirror in a Laguerre-Gaussian (L-G) optorotational system. We found that the effect of laser phase noise was non-negligible on the field-mirror entanglement especially at a larger input power and a larger angular momentum. We also investigated the influence of laser phase noise on the ground-state cooling of the rotating mirror. In the presence of laser phase noise, the ground-state cooling of the rotating mirror can still be realized within a range of input powers.
We theoretically investigate the effect of phase noise on the stationary entanglement of an optomechanical system, which has the additional Kerr medium in the cavity. There are two kinds of interactions in the system, photon-mirror interaction and photon-photon interaction. We find that the optomechanical entanglement can be suppressed by the phase noise of the pumping laser and Kerr interaction of photons. We also find that Kerr interaction can make the phase-noise-induced double peak of the stationary entanglement change to a single peak.
Abstract In this paper, we study the effects of phase noise associated with the pump laser which drives the parametric amplifier (PA) on the detection of a weak classical force acting on a free test mass. The optomechanical system is considered to be dissipatively coupled. The presence of PA in a dissipatively coupled optomechanical system allows to achieve force sensitivity much better than the standard quantum limit (SQL) for a wider range of detection frequency (Huang and Agarwal 2017 Phys. Rev. A 95 023844). However, our results show that the introduction of pump phase noise into the system strongly effects the force sensing. Interestingly, we find that for an optimum choice of different parameters, one can still realize force sensing better than SQL even in the presence of pump phase noise of PA.