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Received: Jul. 4, 2020
Accepted: Sep. 4, 2020
Posted: Nov. 26, 2020
Published Online: Dec. 18, 2020
The Author Email: Qizhang Yuan (lphysics@shnu.edu.cn), Xunli Feng (xlfeng@shnu.edu.cn)
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Qizhang Yuan, Xunli Feng. Photons can hide where they have been[J]. Chinese Optics Letters, 2021, 19(1): 012701
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Quantum Optics and Quantum Information
Chinese Optics Letters, Vol. 19, Issue 1, 012701 (2021)
Photons can hide where they have been 
Qizhang Yuan* and Xunli Feng**
Author Affiliations
- Department of Physics, Mathematics and Science College of Shanghai Normal University, Shanghai 200234, China
Abstract
Recently, the nested Mach–Zehnder interferometer [Phys. Rev. Lett. 111, 240402 (2013)] was modified by adding Dove prisms in a paper [Quantum Stud.: Math. Found. 2, 255 (2015)], and an interesting result is that, after the Dove prisms were inserted, a signal at the first mirror of the nested interferometer was obtained. But, according to the former original paper, the photons have never been present near that mirror. In this work, we interpret this result naturally by resorting to the three-path interference method. Moreover, we find that even though the photons have been somewhere, they can hide the trace of being there.
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