Direct measurement of optical-trap-induced decoherence
Direct measurement of optical-trap-induced decoherence
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直接测量光阱引起的退相干
DOI：
10.1103/physreva.94.033822
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Yoichi Aso
中科院分区：
文献类型：
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作者：
Nobuyuki Matsumoto;Kentaro Komori;Sosuke Ito;Yuta Michimura;and Yoichi Aso
热退相干是实现大质量机械振子量子相干性的主要障碍。虽然光学捕获已被用于降低此类振荡器的热退相干率，但它也通过使振荡器受到由光场频率波动引起的随机力而增加了速率，从而对降低设置了基本限制。这类似于主动反馈系统中的噪声惩罚。在这里，我们直接测量了一个初始冷却和光学捕获的悬浮镜的再热化过程，并确定了由于光学捕获引起的电流限制退相干率。我们对陷阱诱导退相干率的实验研究将使未来在坏腔区探索基本量子力学方面取得进展，例如变形换向子的测试。
Thermal decoherence is a major obstacle to the realization of quantum coherence for massive mechanical oscillators. Although optical trapping has been used to reduce the thermal decoherence rate for such oscillators, it also increases the rate by subjecting the oscillator to stochastic forces resulting from the frequency fluctuations of the optical field, thereby setting a fundamental limit on the reduction. This is analogous to the noise penalty in an active feedback system. Here, we directly measure the rethermalization process for an initially cooled and optically trapped suspended mirror, and identify the current limiting decoherence rate as due to the optical trap. Our experimental study of the trap-induced decoherence rate will enable future advances in the probing of fundamental quantum mechanics in the bad-cavity regime, such as testing of deformed commutators.