Optical Bell-state analysis in the coincidence basis

Details Optical Bell-state analysis in the coincidence basis Optical Bell-state analysis in the coincidence basis

2002-12-10

arxiv.org/abs/quant-ph/0212058v1

Europhysics Letters 62, 161-167 (2003).

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

10.1209/epl/i2003-00339-6

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, \textbf{58}, R2623 (1998)].

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