Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1106.0788 · Physical Review A

Optomechanical entanglement in the presence of laser phase noise

Roohollah Ghobadi, Alireza Bahrampour, Christoph Simon

Published Dec 12, 2011• 30 citations
arXivHTMLPDF

Abstract

We study the simplest optomechanical system in the presence of laser phase noise (LPN) using the covariance matrix formalism. We show that for any LPN model with a finite correlation time, the destructive effect of the phase noise is especially strong in the bistable regime. This explains why ground-state cooling is still possible in the presence of phase noise, as it happens far away from the bistable regime. We also show that the optomechanical entanglement is strongly affected by phase noise.

DOI
10.1103/physreva.84.063827

Related papers

Quantum optomechanics in the bistable regime

Roohollah Ghobadi, Alireza Bahrampour, Christoph Simon

We study the simplest optomechanical system with a focus on the bistable regime. The covariance matrix formalism allows us to study both cooling and entanglement in a unified framework. We identify two key factors governing entanglement; namely, the bistability parameter (i.e., the distance from the end of a stable branch in the bistable regime) and the effective detuning, and we describe the optimum regime where entanglement is greatest. We also show that, in general, entanglement is a nonmonotonic function of optomechanical coupling. This is especially important in understanding the optomechanical entanglement of the second stable branch.

arXiv:1104.4145•Physical Review A•Sep 22, 2011•101 citations

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

Rizwan Ahmed, Shahid Qamar

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.

Physica Scripta•Mar 7, 2019•5 citations

Effect of phase noise on the generation of stationary entanglement in cavity optomechanics

Mehdi Abdi, Sh. Barzanjeh, P. Tombesi +1 more

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.

arXiv:1106.0029•Physical Review A•Sep 19, 2011•83 citations

Effect of laser phase noise on the steady-state field-mirror entanglement and ground-state cooling in a Laguerre-Gaussian optorotational system

Yupeng Chen, Sumei Huang, Li Deng +1 more

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.

Optics Express•Apr 17, 2024•6 citations

Effect of laser phase noise on the fidelity of optomechanical quantum memory

Farnaz Farman, Alireza Bahrampour

Optomechanical and electromechanical cavities have been widely used in quantum memories and quantum transducers. We theoretically investigate the robustness of optomechanical and electromechanical quantum memories against the noise of the control laser. By solving the Langevin equations and using the covariance matrix formalism in the presence of laser noise, the storing fidelity of Gaussian states is obtained. It is shown that the destructive effect of phase noise is more significant in higher values of coupling laser amplitude and optomechanical coupling strength $G$. However, by further increasing the coupling coefficient, the interaction time between photons and phonons decreases below the coherence time of laser frequency noise and the destructive effect of laser phase noise on the storing fidelity drops as well.

arXiv:1501.02221•Physical Review A•Mar 23, 2015•7 citations

Quantum theory of laser noise in coherent-scattering levitated optomechanics

Davide Candoli, Andreu Riera-Campeny, Lorenzo Dania +7 more

State purity is a key resource for experimental tests of quantum mechanics with massive objects. Cavity cooling of a levitated nanoparticle via coherent scattering stands out as a strategy to prepare highly pure states of its roto-translational motion. In several cases, though, the performance of cooling by coherent scattering is limited by the classical fluctuations of the laser field. Here we present a quantum theory of coherent-scattering experiments which includes the effect of the laser amplitude and phase noise. We derive a master equation for the noise-averaged particle's dynamics, valid for both center-of-mass and rotational degrees of freedom, and quantify the cooling performance for different levels of noise in state-of-the-art experiments. We compute approximate analytical expressions for the laser-noise-induced heating rates and excess phonon number in both regimes of weak and strong optomechanical coupling. Moreover, our model can be applied to laser noise processes with generic power spectral densities and finite correlation times. This work offers a toolbox to quantify and optimize the state purity in coherent-scattering experiments, and opens new avenues towards the preparation of quantum states with levitated systems.

quant-pharXiv:2610.32368•Oct 26, 2026•0 citations
We study the simplest optomechanical system in the presence of laser phase noise (LPN) using the covariance matrix formalism. We show that for any LPN model with a finite correlation time, the destructive effect of the phase noise is especially strong in the bistable regime. This explains why ground-state cooling is still possible in the presence of phase noise, as it happens far away from the bistable regime. We also show that the optomechanical entanglement is strongly affected by phase noise.
We study the simplest optomechanical system with a focus on the bistable regime. The covariance matrix formalism allows us to study both cooling and entanglement in a unified framework. We identify two key factors governing entanglement; namely, the bistability parameter (i.e., the distance from the end of a stable branch in the bistable regime) and the effective detuning, and we describe the optimum regime where entanglement is greatest. We also show that, in general, entanglement is a nonmonotonic function of optomechanical coupling. This is especially important in understanding the optomechanical entanglement of the second stable branch.
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.
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.
Optomechanical and electromechanical cavities have been widely used in quantum memories and quantum transducers. We theoretically investigate the robustness of optomechanical and electromechanical quantum memories against the noise of the control laser. By solving the Langevin equations and using the covariance matrix formalism in the presence of laser noise, the storing fidelity of Gaussian states is obtained. It is shown that the destructive effect of phase noise is more significant in higher values of coupling laser amplitude and optomechanical coupling strength GGG. However, by further increasing the coupling coefficient, the interaction time between photons and phonons decreases below the coherence time of laser frequency noise and the destructive effect of laser phase noise on the storing fidelity drops as well.
State purity is a key resource for experimental tests of quantum mechanics with massive objects. Cavity cooling of a levitated nanoparticle via coherent scattering stands out as a strategy to prepare highly pure states of its roto-translational motion. In several cases, though, the performance of cooling by coherent scattering is limited by the classical fluctuations of the laser field. Here we present a quantum theory of coherent-scattering experiments which includes the effect of the laser amplitude and phase noise. We derive a master equation for the noise-averaged particle's dynamics, valid for both center-of-mass and rotational degrees of freedom, and quantify the cooling performance for different levels of noise in state-of-the-art experiments. We compute approximate analytical expressions for the laser-noise-induced heating rates and excess phonon number in both regimes of weak and strong optomechanical coupling. Moreover, our model can be applied to laser noise processes with generic power spectral densities and finite correlation times. This work offers a toolbox to quantify and optimize the state purity in coherent-scattering experiments, and opens new avenues towards the preparation of quantum states with levitated systems.