Physics – Quantum Physics
Scientific paper
2007-04-17
PHYSICAL REVIEW A 76, 063805 (2007)
Physics
Quantum Physics
11 pages and 2 figures
Scientific paper
10.1103/PhysRevA.76.063805
In this paper, photonic entanglement and interference are described and analyzed with the language of quantum information process. Correspondingly, a photon state involving several degrees of freedom is represented in a new 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.
Guo Guang-Can
Huang Yun-Feng
Liu Bao Hua
Ou Zhe Yu
Sun Fang-Wen
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