用反馈补偿分束器实现光场分量的量子无损测量
Quantum nondemolition measurement of a light field component by a feedback compensated beam splitter
摘要：
在传统的量子非破坏测量中，信号和探针之间的相互作用保持了测量变量。或者，可以通过反馈恢复变量的原始值。本文描述了一种利用反馈补偿分束器对光场正交分量进行量子非破坏测量的方法。由分束器的真空端口引起的噪声由线性反馈补偿，从而导致观察变量的有效放大。然后通过光学参量放大来反转该放大，以恢复场分量的原始值。
英文摘要：
In conventional quantum nondemolition measurements, the interaction between signal and probe preserves the measured variable. Alternatively, it is possible to restore the original value of the variable by feedback. In this paper, we describe a quantum nondemolition measurement of a quadrature component of the light field using a feedback compensated beam splitter. The noise induced by the vacuum port of the beam splitter is compensated by a linear feedback resulting in an effective amplification of the observed variable. This amplification is then be reversed by optical parametric amplification to restore the original value of the field component.
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