光机系统中非因果光学响应与非经典性的相互涌现
Mutual emergence of noncausal optical response and nonclassicality in an optomechanical system
摘要：
我们表明，单模非经典的输出光机械腔和非因果线性光学响应，这种腔出现在相同的临界腔机械耦合。换句话说，当避免超光速通信的屏障（电磁学中）被解除时，就会出现单模非经典性。非因果行为出现的性质并不取决于腔的长度（边界条件）和类型。非因果行为的起源是在腔的外表面处的入射波和反射波之间的时间/频率关系。我们进一步讨论了与最近研究的关系：（i）全同粒子间纠缠与准粒子激发的非经典性的等价性，（ii）真空超流行为的必然性，（iii）纠缠-虫洞等价性。
英文摘要：
We show that single-mode nonclassicality of the output of an optomechanical cavity and the noncausal linear optical response of this cavity emerge at the same critical cavity-mechanical coupling. In other words, single-mode nonclassicality emerges when the barrier (in electromagnetism) avoiding faster-than-light communication is lifted off. The nature of the emergence of noncausal behavior does not depend on the length (boundary conditions) and the type of the cavity. Origin of the noncausal behavior is the temporal/frequency relations between the incident and reflected waves at the outer surface of the cavity. We further discuss the relations with the recent studies; (i) equivalence of the entanglement among identical particles to the nonclassicality of their quasiparticle excitations, (ii) necessity of superfluid behavior of vacuum, and (iii) entanglement-wormhole equivalence.
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