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Quantum coherence and interference in Young's experiments

Hao-Sheng ZengWen-Jing PengShu-Min Wu
Mar 2023
摘要
We propose the concept of pair-wise coherence to study the relation betweenthe l1 norm of coherence and the quantum interference in Young's multi-photonmulti-path experiments, where the input photons may be entangled each other. Wefind that only the local coherence of each single photon can make quantuminterference and the collective coherence between photons has no contributionto quantum interference. The visibility of interference fringe is commonly lessthan the l1norm of coherence of the corresponding input state, suggesting thatthe l1 norm of coherence is only the necessary but not sufficient condition forquantum interference. We also find that the maximal fringe visibility can reachone. The optimal input states for producing the maximal visibility arepresented.
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