Entanglement and interference between different degrees of freedom of photon states
Journal Article
·
· Physical Review. A
- Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026 (China)
In this paper, photonic entanglement and interference are described and analyzed with the language of quantum information processing. Correspondingly, a photon state involving several degrees of freedom is represented in an expression based on the permutation symmetry of bosons. In this expression, each degree of freedom of a single photon is regarded as a qubit and operations on photons as qubit gates. The two-photon Hong-Ou-Mandel interference is well interpreted with it. Moreover, the analysis reveals the entanglement between different degrees of freedom in a four-photon state from parametric down conversion, even if there is no entanglement between them in the two-photon state. The entanglement will decrease the state purity and photon interference visibility in the experiments on a four-photon polarization state.
- OSTI ID:
- 21140698
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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