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arXiv 1607.04892quant-phcond-mat.mes-hallcond-mat.supr-con
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光子阻塞击穿相变的观测

Observation of the photon-blockade breakdown phase transition

J. M. Fink, A. Dombi, A. Vukics, A. Wallraff, P. Domokos

摘要:

在阻尼驱动的开放量子系统中,当外部参数的连续调节导致两个鲁棒定态之间的转变时,存在非平衡相变。在二阶转变中,这种变化在临界点处是突然的,而在一阶转变中,两相可以共存于临界滞后域中。本文报道了在一个驱动电路量子电动力学(QED)系统中观察到的一阶耗散量子相变。当驱动功率增加,被驱动腔-原子系统的光子阻塞被打破时,就会发生这种现象。所观察到的实验签名是具有由驱动强度控制的不同权重的双峰相空间分布。我们的测量表明,当量子系统的大小从一个增加到三个人工原子时,经典吸引子的稳定性提高到毫秒范围。这种稳定的指针态的形成可以用于新的量子测量方案或研究多光子量子多体相位。

英文摘要:

Non-equilibrium phase transitions exist in damped-driven open quantum systems, when the continuous tuning of an external parameter leads to a transition between two robust steady states. In second-order transitions this change is abrupt at a critical point, whereas in first-order transitions the two phases can co-exist in a critical hysteresis domain. Here we report the observation of a first-order dissipative quantum phase transition in a driven circuit quantum electrodynamics (QED) system. It takes place when the photon blockade of the driven cavity-atom system is broken by increasing the drive power. The observed experimental signature is a bimodal phase space distribution with varying weights controlled by the drive strength. Our measurements show an improved stabilization of the classical attractors up to the milli-second range when the size of the quantum system is increased from one to three artificial atoms. The formation of such robust pointer states could be used for new quantum measurement schemes or to investigate multi-photon quantum many-body phases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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