Ultrabright source of polarization-entangled photons

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 60, Issue 2, 1999, Pages R773-R776

  Kwiat, Paul G ^a   Waks, Edo ^a   White, Andrew G ^a   Appelbaum, Ian ^a   Eberhard, Philippe H ^b  

^a LOS ALAMOS NATIONAL LABORATORY   (United States)

^b UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000860046     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.60.R773     Document Type: Article

References (44)

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29. See also, Burlakov et al, Phys. Rev. A 56, 3214 (1997), who discuss adjacent crystals, but without polarization correlations.
30. Based on a simple geometrical argument, the spatial overlap will be high if (Formula presented) with cone opening angle (Formula presented) crystal thickness L, and pump beam diameter D. The constraint on transverse walkoff in the crystals is similar if we replace (Formula presented) by the walkoff angle ρ (typically ≈4°).
31. Some of the singles rate net polarization may be due to an unexpectedly high background fluorescence from the BBO crystals, nearly one-third of the true singles rate.
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33. Significantly, this is roughly the minimum rate for quantum cryptography in an earth-to-satellite configuration [W. T. Buttler et al, Phys. Rev. Lett. 81, 3283 (1998)].
34. φ also depends on the azimuthal angle of production—photons produced in crystal 1 are extraordinarily polarized in crystal 2, so the refractive index depends on direction; however, for us the total azimuthal variation in φ was negligible, 0.017°. It could in any event be eliminated entirely by adding a compensation crystal identical in size and orientation to crystal 2.
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