Laser Physics

, Volume 16, Issue 11, pp 1517–1524 | Cite as

Efficient generation of polarization-entangled photons in a nonlinear crystal

  • F. N. C. Wong
  • J. H. Shapiro
  • T. Kim
Quantum Information and Quantum Computation


We review the use of bidirectional pumping and collinear propagation in type-II phase-matched periodically poled KTiOPO4 to achieve efficient generation of polarization-entangled photons via spontaneous parametric downconversion. The advantages of this approach are fully exploited in our optimized polarization Sagnac interferometric source. Its measured flux of 4700 polarization-entangled photon pairs/s per milliwatt of pump power in a 1-nm bandwidth exhibited 99% quantum-interference visibility. We also present a plane-wave Gaussian state theory for continuous-wave spontaneous parametric downconversion. This formulation affords the complete description of multiple-pair emissions that is needed for quantum communication analyses while reducing to the usual biphoton-state description at low generation rates.

PACS numbers

42.65.Lm 03.65.Ud 03.67.Mn 42.50.Dv 


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Copyright information

© MAIK “Nauka/Interperiodica” 2006

Authors and Affiliations

  • F. N. C. Wong
    • 1
  • J. H. Shapiro
    • 1
  • T. Kim
    • 1
  1. 1.Research Laboratory of ElectronicsMassachusetts Institute of TechnologyCambridgeUSA

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