Backaction-evading impulse measurement with mechanical quantum sensors
Backaction-evading impulse measurement with mechanical quantum sensors
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DOI：
10.1103/physreva.102.023525
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Sohitri Ghosh;D. Carney;P. Shawhan;Jacob M. Taylor
中科院分区：
文献类型：
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作者：
Sohitri Ghosh;D. Carney;P. Shawhan;Jacob M. Taylor
对任何可观察物的量子测量自然会导致测量行为所增加的噪声。避免或减少这种噪声的方法可以导致各种传感器的实质性改进，从激光干涉仪到精密磁力计等等。在本文中，我们开发了一个测量协议的基础上，由引力波社区的开创性工作，允许减少增加的噪声测量耦合的光场的动量的小镜子。作为一个具体的实现，我们提出了一个连续的测量协议，使用双环光机械腔。我们证明，与实验相关的参数，该协议可以导致显着的反作用噪声规避，产生测量噪声低于标准量子限制超过几十年的频率。
The quantum measurement of any observable naturally leads to noise added by the act of measurement. Approaches to evade or reduce this noise can lead to substantial improvements in a wide variety of sensors, from laser interferometers to precision magnetometers and more. In this paper, we develop a measurement protocol based upon pioneering work by the gravitational wave community which allows for reduction of added noise from measurement by coupling an optical field to the momentum of a small mirror. As a specific implementation, we present a continuous measurement protocol using a double-ring optomechanical cavity. We demonstrate that with experimentally-relevant parameters, this protocol can lead to significant back-action noise evasion, yielding measurement noise below the standard quantum limit over many decades of frequency.