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Advanced Quantum Technologies

Unconventional Photon Blockade in a Hybrid Optomechanical System with an Embedded Spin‐Triplet

Yao Dong, Jing‐jing Wang, Guo‐Feng Zhang

Published Sep 2, 2024• 2 citations
Publisher

Abstract

Abstract This research investigates the unconventional photon blockade in a hybrid optomechanical system with an embedded spin‐triplet state. The self‐homodyning interference between squeezed quantum fluctuations produced by the emitter and the coherent fraction from the driving laser results in two‐photon suppression. Analytical solutions of the correlator equation and numerical simulations of the master equation reveal that modulated mechanical dissipation plays a crucial role in achieving strong single‐photon blockade. In contrast to conventional cavity optomechanical systems, a second‐order correlation function of can be achieved with weak single‐photon optomechanical coupling. By combining unconventional and conventional antibunching, the hybrid system achieves the convergence of maximal photon population, two‐photon interference, and suppression of higher‐order correlations. Additionally, the influence of the thermal noise on photon blockade is investigated, demonstrating greater robustness of the second‐order correlation under weaker phonon‐spin coupling.

DOI
10.1002/qute.202400232

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Abstract This research investigates the unconventional photon blockade in a hybrid optomechanical system with an embedded spin‐triplet state. The self‐homodyning interference between squeezed quantum fluctuations produced by the emitter and the coherent fraction from the driving laser results in two‐photon suppression. Analytical solutions of the correlator equation and numerical simulations of the master equation reveal that modulated mechanical dissipation plays a crucial role in achieving strong single‐photon blockade. In contrast to conventional cavity optomechanical systems, a second‐order correlation function of can be achieved with weak single‐photon optomechanical coupling. By combining unconventional and conventional antibunching, the hybrid system achieves the convergence of maximal photon population, two‐photon interference, and suppression of higher‐order correlations. Additionally, the influence of the thermal noise on photon blockade is investigated, demonstrating greater robustness of the second‐order correlation under weaker phonon‐spin coupling.
The research article studies the unconventional photon blockade effect in a hybrid optomechanical system with an embedded spin-triplet state. The interaction between the optomechanical system and the spin state generates new transition paths for the destructive quantum interference of the two-photon excitation state. By analytically solving the Schrodinger equation and numerically simulating the master equation, it can be found that the modulated mechanical dissipation is essential for achieving the strong photon blockade in our system. Unlike the conventional cavity optomechanical system, the second-order correlation function g(2)(0) =0 can be obtained with the weak single-photon optomechanical coupling. By adjusting the system parameters, the strong photon blockade and the single-photon resonance can coincide, which indicates the hybrid system has the potential to be a high-quality and efficient single-photon source. Finally, the influence of the thermal noise on photon blockade is investigated. The results show that the second-order correlation function is more robust for the weaker phonon-spin coupling.
Abstract A phonon blockade is achieved in a hybrid optomechanical system including an ensemble of two‐level quantum emitters. The introduction of the ensemble of quantum emitters sets up a mechanism of quantum destructive interference within the system, by which the phonon statistical characteristic exhibits strong antibunching under the condition of weak driving and weak coupling. By analyzing the analytic solution of the second‐order correlation function, the optimal parametric condition for ideal phonon blockade effect is obtained. The numerical simulation of the second‐order correlation function perfectly accord with the analytical solution. The validity of the effective Hamiltonian is proved by the numerical simulations with quantum master equation. The proposed scheme provides a possible way to realize the single‐phonon source experimentally.
Abstract Photon statistics in a weakly driven optomechanical cavity, with Kerr-type nonlinearity, are analyzed both analytically and numerically. The single-photon blockade effect is demonstrated via calculations of the zero-time-delay second-order correlation function g (2) (0). The analytical results obtained by solving the Schrödinger equation are in complete conformity with the results obtained through numerical solution of the quantum master equation. A systematic study on the parameter regime for observing photon blockade in the weak coupling regime is reported. The parameter regime where the photon blockade is not realizable due to the combined effect of nonlinearities owing to the optomechanical coupling and the Kerr-effect is demonstrated. The experimental feasibility with state-of-the-art device parameters is discussed and it is observed that photon blockade could be generated at the telecommunication wavelength. An elaborate analysis of the thermal effects on photon antibunching is presented. The system is found to be robust against pure dephasing-induced decoherences and thermal phonon number fluctuations.
Abstract In this paper, conventional phonon blockade (CPNB) and conventional photon blockade (CPTB) effects, as well as unconventional phonon blockade (UPB) effects, are studied in an optomechanical system with nonlinear interaction between the cavity frequency and the square of the mechanical displacement driven by an external field, where a two‐level atom couples with the mechanical mode and a microwave driving field pumps cavity mode. The second‐order correlation function is analytically calculated, which is in good agreement with the numerical simulation given by the master equation. With energy‐level diagram, the atom‐mechanical mode coupling is found to induces the degeneracy splitting of the states and give the optimal conditions for CPNB and CPTB in this system. With the origin of UPB, the optimal conditions are derived and it is found that the realization of UPB is determined by the two couplings of the cavity and atom with respect to the mechanical mode. Moreover, some discussions on the experimental implementation in this quadratically coupled optomechanical system are presented. This study provides a possible way for realizing single‐photon nonlinearity and can extend the applications of optomechanical systems in the field of quantum optics.
The single‐photon blockade effect arising in a cavity containing a quantum well and interacting with squeezed light, resulting from a down‐conversion process through a nonlinear medium, is investigated. Optical parametric oscillator (OPO) materials with positive and negative second‐order susceptibilities are considered. By solving the master equation analytically in the weak‐driving limit and calculating the second‐order equal‐time correlation function, it is found that strong photon antibunching can be achieved in this system with weak excitonic nonlinearity or squeezed light via a destructive quantum interference mechanism. The optimal conditions for the photon blockade are derived analytically and discussed in details. Unlike the excitonic nonlinearity, a strong photon blockade occurs with the squeezed light at total or quasitotal resonance, even in the weak coupling regime, using an OPO material with negative second‐order nonlinear susceptibility. By acting on the driving coherent pump frequency, the control of the cavity output is achieved and the scheme can serve as a tunable single‐photon emission source.
A scheme is proposed to enhance the photon blockade effect in a hybrid optomechanical system with a $\mathrm{\ensuremath{\Lambda}}$-type atom driven by the microwave. Through analyzing the conventional and unconventional blockade mechanisms, we find that the enhanced photon blockade effect can be attributed to two aspects: (i) The nonresonant coupled $\mathrm{\ensuremath{\Lambda}}$-type atom reconstructs the anharmonic eigenenergy spectrum and (ii) the microwave driving field promotes the destructive quantum interference for two-photon excitation. By means of the joint enhancement effect, the perfect photon blockade, i.e., the second-order correlation function ${g}^{(2)}(0)\ensuremath{\simeq}0$, can be achieved without the strong single-photon optomechanical coupling as reported in the standard optomechanical system. All the analyses and derivations are further verified via simulating numerically the quantum master equation of the initial Hamiltonian, showing good agreement between analytical and numerical results. Moreover, the optimal parameter relation is given to optimize the photon blockade and maximize the occupancy probability of single-photon excitation at the same time. Our scheme provides a feasible method to engineer a high-quality and efficient single-photon source.