Quantum interference between heralded single photon state and coherent state
Quantum interference between heralded single photon state and coherent state
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预示着单光子态和相干态之间的量子干涉
DOI：
10.1088/1674-1056/26/7/074206
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发表时间：
2017-06
影响因子：
1.7
通讯作者：
Xiaoying Li
中科院分区：
文献类型：
--
作者：
Lei Yang;Xiaoxin Ma;Xiaoying Li
平衡零拍探测是一种可靠的单光子Fock态量子态重建技术，它是将单光子态与强相干本振子耦合在分束器中，并分别在输出端探测场的正交性。与单光子状态的层析表征相关联的主要挑战是单光子状态和本地振荡器之间的模式匹配。利用自发参量过程产生的预示单光子，建立了光纤分束器中单光子态与相干态量子干涉的多模理论模型。给出了时间模匹配系数和干涉可见度的解析表达式以及两者之间的关系。在实验方案中，给出了不同时间模式匹配系数下的干涉可见度，与理论值基本一致。研究了基于本振的单光子态与相干光子态的时间模匹配原理，为设计高性能的平衡零拍探测系统提供了理论指导。
Balanced homodyne detection has been introduced as a reliable technique of reconstructing the quantum state of a single photon Fock state, which is based on coupling the single photon state and a strong coherent local oscillator in a beam splitter and detecting the field quadrature at the output ports separately. The main challenge associated with a tomographic characterization of the single photon state is mode matching between the single photon state and the local oscillator. Utilizing the heralded single photon generated by the spontaneous parametric process, the multi-mode theoretical model of quantum interference between the single photon state and the coherent state in the fiber beam splitter is established. Moreover, the analytical expressions of the temporal-mode matching coefficient and interference visibility and relationship between the two parameters are shown. In the experimental scheme, the interference visibility under various temporal-mode matching coefficients is demonstrated, which is almost accordant with the theoretical value. Our work explores the principle of temporal-mode matching between the single photon state and the coherent photon state, originated from a local oscillator, and could provide guidance for designing the high-performance balanced homodyne detection system.
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