论文标题
在纠缠存在下光场的时间连贯性
Temporal coherence of optical fields in the presence of entanglement
论文作者
论文摘要
在经典相干理论中，相干时间通常与光场的带宽有关。缩小带宽将导致连贯时间的延长。这将由于脉冲光子干扰的时间延迟而消除光子的时间区分性。但是，在涉及量子纠缠的SU（1,1）型量子干涉仪中，这种情况会改变。在本文中，我们研究了脉冲泵式SU（1,1）干涉仪中磁场的时间连贯性如何随光学滤波的带宽而变化。我们发现，由于量子纠缠，与经典的一致性理论相反，当应用光学滤波时，场的连贯性并不能改善，而量子纠缠在量子干扰中起着至关重要的作用，除了区分性。
In classical coherence theory, coherence time is typically related to the bandwidth of the optical field. Narrowing the bandwidth will result in the lengthening of the coherence time. This will erase temporal distinguishability of photons due to time delay in pulsed photon interference. However, this is changed in an SU(1,1)-type quantum interferometer where quantum entanglement is involved. In this paper, we investigate how the temporal coherence of the fields in a pulse-pumped SU(1,1) interferometer changes with the bandwidth of optical filtering. We find that, because of the quantum entanglement, the coherence of the fields does not improve when optical filtering is applied, in contrary to the classical coherence theory, and quantum entanglement plays a crucial role in quantum interference in addition to distinguishability.
