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全光与电光量子限反馈

All-optical versus electro-optical quantum-limited feedback

H. M. Wiseman, G. J. Milburn

备注：
21 pages. This is an old (1994) paper, but one which I thought was worth posting because in addition to what is described in abstract it has: (1) the first formulation (to my knowledge) of quantum trajectories for an arbitrary (i.e. squeezed, thermal etc.) broadband bath; (2) the prediction of a periodic modification to the detuning and damping of an oscillator for the simplest sort of all-optical feedback (i.e. a mirror) as seen in the recent experiment "Forces between a Single Atom and Its Distant Mirror Image", P. Bushev et al, Phys. Rev. Lett. 92, 223602 (2004)
发表信息：
Phys. Rev. A 49, 4110 (1994)
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摘要：

全光反馈可以通过将源腔的输出通过法拉第隔离器并进入第二腔来实现，第二腔通过非线性晶体耦合到源腔。如果驱动腔是重阻尼的，那么它可以被消除，并单独导出第一个腔的主方程或量子朗之万方程。这是针对任意状态下的输入浴和任意非线性耦合进行的。如果腔间耦合只涉及驱动腔的强度（或一个正交），那么对源腔的影响与使用直接（或零差）检测从电光反馈获得的效果相同。如果耦合涉及两个正交，这种等价性不再成立，并且在源振幅中的线性耦合可以在源腔中产生非经典态。使用外差检测的类似电光方案引入了额外的噪声，这阻止了非经典光的产生。与电光情况不同，全光反馈回路具有输出光束（从第二腔反射）。我们表明，这可能是压缩，即使源腔保持在经典状态。

英文摘要：

All-optical feedback can be effected by putting the output of a source cavity through a Faraday isolator and into a second cavity which is coupled to the source cavity by a nonlinear crystal. If the driven cavity is heavily damped, then it can be adiabatically eliminated and a master equation or quantum Langevin equation derived for the first cavity alone. This is done for an input bath in an arbitrary state, and for an arbitrary nonlinear coupling. If the intercavity coupling involves only the intensity (or one quadrature) of the driven cavity, then the effect on the source cavity is identical to that which can be obtained from electro-optical feedback using direct (or homodyne) detection. If the coupling involves both quadratures, this equivalence no longer holds, and a coupling linear in the source amplitude can produce a nonclassical state in the source cavity. The analogous electro-optic scheme using heterodyne detection introduces extra noise which prevents the production of nonclassical light. Unlike the electro-optic case, the all-optical feedback loop has an output beam (reflected from the second cavity). We show that this may be squeezed, even if the source cavity remains in a classical state.

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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