Optical Bell-state analysis in the coincidence basis
Universidade Federal de Minas Gerais - Caixa Postal 702
Belo Horizonte, MG 30123-970, Brazil
Corresponding author: email@example.com
Accepted: 5 February 2003
Many quantum information protocols require a Bell-state measurement of entangled systems. Most optical Bell-state measurements utilize two-photon interference at a beam splitter. By creating polarization-entangled photons with spontaneous parametric down-conversion using a first-order Hermite-Gaussian pump beam, we invert the usual interference behavior and perform an incomplete Bell-state measurement in the coincidence basis. We discuss the possibility of a complete Bell-state measurement in the coincidence basis using hyperentangled states (Phys. Rev. A, 58 (1998) R2623).
PACS: 03.67.-a – Quantum information / 03.67.Hk – Quantum communication / 42.50.-p – Quantum optics
© EDP Sciences, 2003