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Interferometric Bell-state preparation using femtosecond-pulse-pumped spontaneous parametric down-conversion

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Citation

Kim, Y., Chekhova, M., Kulik, S., Rubin, M., & Shih, Y. (2001). Interferometric Bell-state preparation using femtosecond-pulse-pumped spontaneous parametric down-conversion. PHYSICAL REVIEW A, 63(6): 062301. doi:10.1103/PhysRevA.63.062301.


Cite as: http://hdl.handle.net/21.11116/0000-0001-DF92-F
Abstract
We present a 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 postselection. 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.