Generation of Hyperentangled Photon Pairs
Open accessAbstract
We experimentally demonstrate the first quantum system entangled in every degree of freedom (hyperentangled). Using pairs of photons produced in spontaneous parametric down-conversion, we verify entanglement by observing a Bell-type inequality violation in each degree of freedom: polarization, spatial mode, and time energy. We also produce and characterize maximally hyperentangled states and novel states simultaneously exhibiting both quantum and classical correlations. Finally, we report the tomography of a 2 x 2 x 3 x 3 system (36-dimensional Hilbert space), which we believe is the first reported photonic entangled system of this size to be so characterized.
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In an experiment by Barreiro et al. (2005), photon pairs from a single nonlinear crystal were entangled in polarization, energy, and orbital angular momentum.
“In an experiment by Barreiro et al (2005), besides the entanglement in polarization and in energy, photon pairs from a single nonlinear crystal were also entangled in orbital angular momentum.”
From Multiphoton entanglement and interferometry (2012) · cites this paper as Barreiro et al (2005)
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- Authors
- Barreiro, J. T., Langford, N. K., Peters, N. A., & Kwiat, P. G.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- The University of Queensland (AU)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2005-12-19
- Volume
- 95
- Issue
- 26
- Pages
- 260501-260501
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2014116836
- Cited by
- 750
- References
- 8
- Citations by year
- 2026: 20 · 2025: 45 · 2024: 29 · 2023: 32 · 2022: 36 · 2021: 30 · 2020: 38 · 2019: 44 · 2018: 43 · 2017: 42 · 2016: 36 · 2015: 46 · 2014: 45 · 2013: 33 · 2012: 38
- FWCI
- 32.04
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical Review Letters (publishedVersion)
- arXiv (Cornell University) (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Orbital Angular Momentum in Optics
- Keywords
- hyperentanglement, spontaneous parametric down-conversion, Bell inequality violation, polarization entanglement, spatial mode entanglement, energy-time entanglement, maximally entangled states, high-dimensional entanglement, quantum state tomography
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