Physics – Quantum Physics
Scientific paper
2002-03-22
Phys. Rev. A 66, 033816 (2002)
Physics
Quantum Physics
12 pages, 11 figures, REVTEX
Scientific paper
10.1103/PhysRevA.66.033816
We report the generation of polarization-entangled photons by femtosecond-pulse-pumped spontaneous parametric down-conversion in a cascade of two type-I crystals. Highly entangled pulsed states were obtained by introducing a temporal delay between the two orthogonal polarization components of the pump field. They exhibited high-visibility quantum interference and a large concurrence value, without the need of post-selection using narrow-bandwidth-spectral filters. The results are well explained by the theory which incorporates the space-time dependence of interfering two-photon amplitudes if dispersion and birefringence in the crystals are appropriately taken into account. Such a pulsed entangled photon well localized in time domain is useful for various quantum communication experiments, such as quantum cryptography and quantum teleportation.
Matsumoto Katsumi
Nakamura Kazuo
Nambu Yasusada
Tsuda Yoshinori
Usami Katsuhisa
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