Physics – Quantum Physics
Scientific paper
2001-03-30
PRA 63, 062301 (2001)
Physics
Quantum Physics
11 pages, two-column format, to appear in PRA
Scientific paper
10.1103/PhysRevA.63.062301
We present theoretical and experimental study of preparing maximally entangled two-photon polarization states, or Bell states, using femtosecond pulse pumped spontaneous parametric down-conversion (SPDC). First, we show how the inherent distinguishability in femtosecond pulse pumped type-II SPDC can be removed by using an interferometric technique without spectral and amplitude post-selection. We then analyze the recently introduced Bell state preparation scheme using type-I SPDC. Theoretically, both methods offer the same results, however, type-I SPDC provides experimentally superior methods of preparing Bell states in femtosecond pulse pumped SPDC. Such a pulsed source of highly entangled photon pairs is useful in quantum communications, quantum cryptography, quantum teleportation, etc.
Chekhova Maria V.
Kim Yoon-Ho
Kulik Sergei P.
Rubin Morton H.
Shih Yanhua
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