Duality relation between coherence and path information in the presence of quantum memory

Kaifeng Bu, Lu Li, Junde Wu, and Shao-Ming Fei

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Submission date: 06. Feb. 2018
Pages: 8
published in: Journal of physics / A, 51 (2018) 8, art-no. 085304 
DOI number (of the published article): 10.1088/1751-8121/aa9b4f
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Abstract:
The wave-particle duality demonstrates a competition relation between wave and particle behavior for a particle going through an interferometer. This duality can be formulated as an inequality, which upper bounds the sum of interference visibility and path information. However, if the particle is entangled with a quantum memory, then the bound may decrease. Here, we find the duality relation between coherence and path information for a particle going through a multipath interferometer in the presence of a quantum memory, offering an upper bound on the duality relation which is directly connected with the amount of entanglement between the particle and the quantum memory.