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Krenn M, Hochrainer A, Lahiri M, et al. Entanglement by Path Identity. Phys Rev Lett. 2017;118(8):080401doi: 10.1103/PhysRevLett.118.080401.
Krenn, M., Hochrainer, A., Lahiri, M., & Zeilinger, A. (2017). Entanglement by Path Identity. Physical review letters, 118(8), 080401. https://doi.org/10.1103/PhysRevLett.118.080401
Krenn, Mario, et al. "Entanglement by Path Identity." Physical review letters vol. 118,8 (2017): 080401. doi: https://doi.org/10.1103/PhysRevLett.118.080401
Krenn M, Hochrainer A, Lahiri M, Zeilinger A. Entanglement by Path Identity. Phys Rev Lett. 2017 Feb 24;118(8):080401. doi: 10.1103/PhysRevLett.118.080401. Epub 2017 Feb 23. PMID: 28282180.
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Phys Rev Lett. 2017 Feb 24;118(8):080401. doi: 10.1103/PhysRevLett.118.080401. Epub 2017 Feb 23.

Entanglement by Path Identity.

Physical review letters

Mario Krenn, Armin Hochrainer, Mayukh Lahiri, Anton Zeilinger

Affiliations

  1. Vienna Center for Quantum Science & Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria and Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria.

PMID: 28282180 DOI: 10.1103/PhysRevLett.118.080401

Abstract

Quantum entanglement is one of the most prominent features of quantum mechanics and forms the basis of quantum information technologies. Here we present a novel method for the creation of quantum entanglement in multipartite and high-dimensional systems. The two ingredients are (i) superposition of photon pairs with different origins and (ii) aligning photons such that their paths are identical. We explain the experimentally feasible creation of various classes of multiphoton entanglement encoded in polarization as well as in high-dimensional Hilbert spaces-starting only from nonentangled photon pairs. For two photons, arbitrary high-dimensional entanglement can be created. The idea of generating entanglement by path identity could also apply to quantum entities other than photons. We discovered the technique by analyzing the output of a computer algorithm. This shows that computer designed quantum experiments can be inspirations for new techniques.

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