Why two-photon but not two photons?

Fortschritte der Physik

Volumn 46, Issue 6-8, 1998, Pages 627-641

  Shih, Y H ^a   Strekalov, D V ^a,b   Pittman, T D ^a,c   Rubin, M H ^a  

^a UNIVERSITY OF MARYLAND   (United States)

^b POLYTECHNIC UNIVERSITY   (United States)

^c JOHNS HOPKINS UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0032337972     PISSN: 00158208     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3978(199811)46:6/8<627::AID-PROP627>3.0.CO;2-1     Document Type: Article

References (33)

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2. 1, and gave their criteria of physical reality: "if, without in any way disturbing a system, we can predict with certainty the value of a physical quantity, then there exist an element of physical reality corresponding to this quantity." According to EPR's criterion, a single particle in the above state should have defined momentum.
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26. In type-I SPDC, signal and idler are both ordinary (or extraordinary) rays of the crystal: however, in type-II SPDC they are orthogonal polarized, i.e., one is ordinary and the other is extraordinary.
27. coh. In type-II SPDC [14] not only width but also shape of the two-photon wavepacket in t_-direction is quite different: it is rectangular.
28. This device is described in more details in D. V. STREKALOV, T. B. PITTMAN, A. V. SERGIENKO, Y. H. SHIH and P. G. KWIAT, Phys. Rev. A, 54, R1 (1996).
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30. Experimentally, a "photon counting" detector experiences a "click" we conclude the registration of a "photon". If two "photon counting" detectors experience a "click-click" simultaneously, we conclude the registration of a "pair" of photon.
31. s|i is the conditional entropy. So that the conditional entropy must be negative, which means that given the result of a measurement over one particle, the result of measurement over the other must yield negative information.
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33. e.g., C. E. SHANNON and W. WEAVER, The Mathematical Theory of Communication, University of Illinois Press, 1949; C. H. BENNETT, Physics Today, 48(10), 24 (1995).