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arXiv 1708.05883quant-ph
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弱耦合光机系统的简正模分裂

Normal--mode splitting in a weakly coupled optomechanical system

Massimiliano Rossi, Nenad Kralj, Stefano Zippilli, Riccardo Natali, Antonio Borrielli, Gregory Pandraud, Enrico Serra, Giovanni Di Giuseppe, David Vitali

摘要:

简正模分裂是两个相互作用的子系统之间强耦合的最明显的特征。当两个子系统之间交换能量的速度快于它们将能量耗散到环境中时,就会发生这种情况。在这里,我们的实验表明,在室温下的弱耦合光机系统可以表现正常模式分裂时,泵浦场的波动是反压扁的相敏反馈回路操作接近其不稳定性阈值。在这些条件下,光学腔表现出有效降低的衰减速率,使得系统被有效地提升到强耦合状态。

英文摘要:

Normal--mode splitting is the most evident signature of strong coupling between two interacting subsystems. It occurs when two subsystems exchange energy between themselves faster than they dissipate it to the environment. Here we experimentally show that a weakly coupled optomechanical system at room temperature can manifest normal--mode splitting when the pump field fluctuations are anti-squashed by a phase-sensitive feedback loop operating close to its instability threshold. Under these conditions the optical cavity exhibits an effectively reduced decay rate, so that the system is effectively promoted to the strong coupling regime.

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