de Los Ríos Sommer Andrés, Meyer Nadine, Quidant Romain
ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels (Barcelona), Spain.
ICREA-Institució Catalana de Recerca i Estudis Avançats, 08010, Barcelona, Spain.
Nat Commun. 2021 Jan 12;12(1):276. doi: 10.1038/s41467-020-20419-2.
Quantum control of a system requires the manipulation of quantum states faster than any decoherence rate. For mesoscopic systems, this has so far only been reached by few cryogenic systems. An important milestone towards quantum control is the so-called strong coupling regime, which in cavity optomechanics corresponds to an optomechanical coupling strength larger than cavity decay rate and mechanical damping. Here, we demonstrate the strong coupling regime at room temperature between a levitated silica particle and a high finesse optical cavity. Normal mode splitting is achieved by employing coherent scattering, instead of directly driving the cavity. The coupling strength achieved here approaches three times the cavity linewidth, crossing deep into the strong coupling regime. Entering the strong coupling regime is an essential step towards quantum control with mesoscopic objects at room temperature.
对一个系统进行量子控制需要以比任何退相干速率都快的速度操纵量子态。对于介观系统，迄今为止只有少数低温系统能够做到这一点。量子控制的一个重要里程碑是所谓的强耦合 regime，在腔光力学中，它对应于光机械耦合强度大于腔衰减率和机械阻尼。在这里，我们展示了悬浮二氧化硅颗粒与高精细度光学腔在室温下的强耦合 regime。通过采用相干散射而不是直接驱动腔来实现正常模式分裂。这里实现的耦合强度接近腔线宽的三倍，深入到强耦合 regime。进入强耦合 regime是在室温下对介观物体进行量子控制的关键一步。
