Ultra-bright source of polarization-entangled photons

@article{Kwiat1999UltrabrightSO,
  title={Ultra-bright source of polarization-entangled photons},
  author={Paul G. Kwiat and Edo Waks and Andrew G. White and Ian Appelbaum and Philippe H. Eberhard Physics Division and P-23 and Los Alamos National Laboratory and Ginzton Laboratory and Stanford University and Physics Dept. and M.I.T. and Lawrence Berkeley National Laboratory},
  journal={Physical Review A},
  year={1999},
  volume={60}
}
Utilizing the process of spontaneous parametric down-conversion in a novel crystal geometry, a source of polarization-entangled photon pairs has been provided that is more than ten times brighter, per unit of pump power, than previous sources, with another factor of 30 to 75 expected to be readily achievable. A high level of entanglement between photons emitted over a relatively large collection angle, and over a 10-nm bandwidth, is a characteristic of the invention. As a demonstration of the… 

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