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Physical Review A

Superradiance-driven optomechanical entanglement

Kai‐Wei Huang, Xin Wang, Yi Ren, Hao Xiong

Published May 14, 2025• 3 citations
Publisher

Abstract

Entanglement between light and matter has garnered significant interest for wide-ranging applications in quantum technology. However, weak interactions hinder the generation of entanglement. Here, we propose a scheme to achieve bipartite entanglement through superradiant excitation. The optomechanical entanglement exhibits behavior similar to the critical coupling value of superradiant phase transition. We investigate the effects of critical coupling related parameters, such as effective cavity detuning and cavity dissipation, on entanglement. Notably, strong entanglement can be generated even in the unresolved sideband regime. Increasing the number of atoms can reduce the collective coupling strength required to generate entanglement. Additionally, the entanglement is robust against temperature. Our scheme may provide a degree of freedom to manipulate the entanglement driven by superradiance. Our findings may provide a way to enhance the light-matter interaction via atomic assistance, which may be useful for quantum sensing and quantum information.

DOI
10.1103/physreva.111.053713

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Entanglement had played a crucial role in developing frontier technologies as a critical resource, for instance, in quantum teleportation and quantum sensing schemes. Notably, thanks to the ability to cool down the vibrational modes of mechanical oscillators to its quantum regime, entanglement between mechanical modes and the production of nonclassical mechanical states have emerged as central resources for quantum technological applications. Thus, proposing deterministic schemes to achieve those tasks is of paramount importance. While the dominant scheme for bipartite mechanical entanglement involves Gaussian optomechanical interactions (linearized regime) to generate two-mode squeezed vacuum states, entangling two-modes exploiting the bare non-Gaussian optomechanical interaction (nonlinear strong single-photon regime) remains less covered. This work proposes an on-demand scheme to engineer phononic non-Gaussian bipartite entanglement in the nonlinear regime by exploiting cavity dissipation. Interestingly, our protocol (operating in the resolved sideband and photon blockade regime) renders the possibility of achieving a high degree of steady-state entanglement. We further show that our deterministic scheme is robust in the presence of decoherence and temperature within state-of-the-art optomechanics, along with the required conditions to obtain non-Gaussianity of the achieved bipartite mechanical steady-state.
We present a special quantum phenomenon named optomechanically induced entanglement in the conventional single-cavity optomechanical system driven by a strong pump input field and a relatively weak probe input field. Bipartite entanglement between the pump and probe output fields can be achieved under realistic experimental conditions when the input pump (probe) field is blue detuned by the mechanical frequency (resonant) with respect to the cavity field. The physical origin is the mechanical oscillator displacement, which plays a role similar to the atomic coherence for the well-known electromagnetically induced transparency in the traditional \ensuremath{\Lambda}-type atomic system. This scheme provides an alternative, convenient way to generate nondegenerate entangled bright light beams by using only coherent laser fields, and may bring great facility in realistic quantum information processing protocols.
Abstract We present a double-cavity optomechanical system with a mechanical oscillator, which is jointly driven by an amplitude-modulated laser field and a weak squeezed vacuum field, aiming to explore quantum entanglement effects under the unresolved-sideband regime. Within our proposed scheme, it is possible not only to surpass the limit of maximum steady-state entanglement ln2 for bipartite entanglement, achieving strong entanglement, but also to significantly enhance tripartite entanglement and improve the system’s robustness against thermal noise. Meanwhile, the introduction of the squeezed vacuum field plays a crucial role in entanglement control, enabling not only a several-fold enhancement of entanglement but also continuous and precise manipulation of its strength within specific ranges. The suggested method demonstrates exceptional flexibility and adaptability under a wide range of operating conditions, offering a new pathway for theoretical and experimental investigations of strong bipartite entanglement and tripartite entanglement.
We propose an approach to generate strong quantum entanglement by the controllable four-wave-mixing mechanism in a single-cavity, weak-coupling optomechanical system. The optomechanical system is driven by a strong two-tone pump field and a weak signal field, simultaneously. The two-tone pump field consists of a lower and an upper sideband, which couple with the optical cavity and mechanical resonator, and generate the beam-splitter and two-mode squeezing interactions under the rotating-wave approximation. This interaction mechanism modifies the effective susceptibility of the optomechanical cavity and optomechanically induces a four-wave-mixing process. Strong quantum entanglement can be generated between the signal and four-wave-mixing fields in realistic optomechanical systems. The generation scheme of the quantum entanglement is quite robust against thermal-mechanical noise, and significant entanglement can persist at room temperature in the weak-coupling regime.
Abstract Entanglement lies at the core of numerous quantum information processing applications. A main obstacle against implementing powerful quantum information tasks is decoherence that degrades, or even destroys, entanglement. Therefore, developing strategies to mitigate decoherence is essential for practical implementations. Here, we propose a scheme to enhance exciton-exciton entanglement in an exciton-optomechanical cavity incorporating a Kerr medium. Under experimentally feasible conditions, we demonstrate that the Kerr nonlinearity not only strengthens excitonic entanglement, but also allows it to persist over a wide range of operating parameters. While strong exciton-phonon coupling is required for entangling the two excitonic modes in the Kerr medium-free case, we show that such coupling is no longer necessary when the Kerr interaction is introduced. Remarkably, the presence of the Kerr medium enables the excitonic entanglement to survive up to room temperature without requiring a very high mechanical quality factor. Our scheme provides a promising route for generating robust entanglement and may open new possibilities for quantum information applications.
Entanglement and quantum squeezing have wide applications in quantum technologies due to their non-classical characteristics. Here we study entanglement and quantum squeezing in an open spin-optomechanical system, in which a Rabi model (a spin coupled to the mechanical oscillator) is coupled to an ancillary cavity field via a quadratic optomechanical coupling. We find that their performances can be significantly modulated via the photon of the ancillary cavity, which comes from photon-dependent spin-oscillator coupling and detuning. Specifically, a fully switchable spin-oscillator entanglement can be achieved, meanwhile a strong mechanical squeezing is also realized. Moreover, we study the environment-induced decoherence and dissipation, and find that they can be mitigated by increasing the number of photons. This work provides an effective way to manipulate entanglement and quantum squeezing and to suppress decoherence in the cavity quantum electrodynamics with a quadratic optomechanics.