Journal
OPTICS EXPRESS
Volume 30, Issue 7, Pages 11684-11692Publisher
Optica Publishing Group
DOI: 10.1364/OE.452267
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Funding
- National Key Research and Development Program of China [2017YFA0303900]
- National Natural Science Foundation of China [U1738201, U1738142, 11654005, 11904358, 61625503, 11822409, 11674309]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- Anhui Initiative in Quantum Information Technologies
- Youth Innovation Promotion Association of CAS [501100012492, 2018492]
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This study reports an experimental demonstration of Hong-Ou-Mandel interference with photons transmitted by free-space channels. The results show that the quantum property of photons remains even after transmission through unstable free-space channels, indicating the feasibility of free-space-based quantum interference in quantum information processing.
Quantum interference plays an essential role in understanding the concepts of quantum physics. Moreover, the interference of photons is indispensable for large-scale quantum information processing. With the development of quantum networks, interference of photons transmitted through long-distance fiber channels has been widely implemented. However, quantum interference of photons using free-space channels is still scarce, mainly due to atmospheric turbulence. Here, we report an experimental demonstration of Hong-Ou-Mandel interference with photons transmitted by free-space channels. Two typical photon sources, i.e., correlated photon pairs generated in spontaneous parametric down conversion (SPDC) process and weak coherent states, are employed. A visibility of 0.744 +/- 0.013 is observed by interfering with two photons generated in the SPDC process, exceeding the classical limit of 0.5. Our results demonstrate that the quantum property of photons remains even after transmission through unstable free-space channels, indicating the feasibility and potential application of free-space-based quantum interference in quantum information processing. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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