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  Quantum indistinguishability by path identity and with undetected photons

Hochrainer, A., Lahiri, M., Erhard, M., Krenn, M., & Zeilinger, A. (2022). Quantum indistinguishability by path identity and with undetected photons. Reviews of Modern Physics, 94(2): 025007. doi:10.1103/RevModPhys.94.025007.

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 Creators:
Hochrainer, Armin1, 2, Author
Lahiri, Mayukh1, 2, 3, Author
Erhard, Manuel1, 2, Author
Krenn, Mario3, 4, 5, 6, Author           
Zeilinger, Anton1, 2, Author
Affiliations:
1Vienna Center for Quantum Science & Technology (VCQ), Faculty of Physics, University of Vienna, Austria., ou_persistent22              
2Institute for Quantum Optics and Quantum Information (IQOQI) Vienna, Austrian Academy of Sciences, Austria., ou_persistent22              
3Department of Physics, Oklahoma State University, Stillwater, Oklahoma, USA, ou_persistent22              
4Krenn Research Group, Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_3345237              
5Department of Chemistry & Computer Science, University of Toronto, Canada., ou_persistent22              
6Vector Institute for Artificial Intelligence, Toronto, Canada., ou_persistent22              

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 Abstract: Two processes of photon-pair creation can be arranged such that the paths of the emitted photons are identical. The path information is thereby not erased but rather never born in the first place due to this path identity. In addition to its implications for fundamental physics, this concept has recently led to a series of impactful discoveries in the fields of imaging, spectroscopy, and quantum information science. Here the idea of path identity is presented and a comprehensive review of recent developments is provided. Specifically, the concept of path identity is introduced based on three defining experimental ideas from the early 1990s. The three experiments have in common that they contain two photon-pair sources. The paths of one or both photons from the different sources overlap such that no measurement can recognize from which source they originate. A wide range of noteworthy quantum interference effects (at the single- or two-photon level), such as induced coherence, destructive interference of photon pairs, and entanglement generation, are subsequently described. Progress in the exploration of these ideas has stagnated and has gained momentum again only in the last few years. The focus of the review is the new development in the last few years that modified and generalized the ideas from the early 1990s. These developments are overviewed and explained under the same conceptual umbrella, which will help the community develop new applications and realize the foundational implications of this sleeping beauty.

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Language(s): eng - English
 Dates: 2022-06-21
 Publication Status: Published online
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 Identifiers: DOI: 10.1103/RevModPhys.94.025007
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Title: Reviews of Modern Physics
  Other : Rev. Modern Phys.
Source Genre: Journal
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Publ. Info: Minneapolis : American Physical Society
Pages: - Volume / Issue: 94 (2) Sequence Number: 025007 Start / End Page: - Identifier: ISSN: 0034-6861
CoNE: https://pure.mpg.de/cone/journals/resource/954925438533