混合光机械系统中伴随增强纠缠的超辐射现象观测
The Observation of hyperradiance accompanied by enhanced entanglement in a hybrid optomechanical system
AI总结：
本文理论研究了双量子比特耦合单模腔的混合光机械系统，发现光子-声子纠缠显著增强，并可在参数区间内同时观测到超越Dicke $N^2$标度律的超辐射现象。
摘要：
我们从理论上研究了一个光机械系统，并展示了当两个量子比特耦合到腔的单模时，双体光子-声子纠缠显著增强的情形。作为参照，结果与单个量子比特的情况进行了比较。在某些势近似下，忽略两体作用，将三体原子-光子-声子相互作用视为唯一的三体共振相互作用。此外，我们研究了超辐射现象，其中著名的Dicke超辐射（$N^2$标度律）可以因原子间关联而被超越。同时，我们探索了一个参数区间，以同时观测光子-声子对的纠缠及其超辐射。由于证明光子和声子的产生是反聚束的非常重要，等时二阶关联函数$g^{(2)}(0)$被用作见证。该系统可以在电路腔量子电动力学（CCQED）中实现，其中原子与机械谐振器的直接耦合是可能的。
英文摘要：
We have theoretically investigated an optomechanical system and presented the scenario of significantly enhanced bipartite photon-phonon entanglement for two qubits coupled to the single mode of the cavity. And results are compared with the one qubit case for reference. The tripartite atoms-photon-phonon interaction is considered as only three-body resonant interaction while the two-body actions are ignored under some potential approximations. Furthermore, we have studied the phenomenon of hyperradiance in which the well-known Dicke superradiant ($N^2$ scaling law) can be surpassed due to the inter-atomic correlations. Jointly, a parameter regime is explored to observe the entanglement of photon-phonon pairs and their hyperradiance simultaneously. As it is important to show that the generation of photons and phonons are antibunched, the equal time second-order correlation function $g^{(2)}(0)$ is characterized as witness. This system can be realized in Circuit Cavity Quantum Electrodynamics (CCQED) in which the direct coupling of the atom and mechanical resonator is possible.We have theoretically investigated an optomechanical system and presented the scenario of significantly enhanced bipartite photon-phonon entanglement for two qubits coupled to the single mode of the cavity.
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