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Phys. Rev. A 77, 022319 (2008) [9 pages]

Exact minimum and maximum of yield with a finite number of decoy light intensities

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Toyohiro Tsurumaru
Mitsubishi Electric Corporation, Information Technology R&D Center, 5-1-1 Ofuna, Kamakura-shi, Kanagawa 247-8501, Japan

Alexandre Soujaeff and Shigeki Takeuchi
JST-CREST/Research Institute for Electronic Science, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan

Received 28 October 2007; published 14 February 2008

In this paper, for the decoy state method using a finite number of decoy light intensities, we present improved upper and lower bounds for the asymptotic yield yn for n-photon states. In particular if all the light intensities are less than or equal to 1, they are not only a lower or upper bound, but in fact are the exact minimum or maximum.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.022319
DOI:
10.1103/PhysRevA.77.022319
PACS:
03.67.Dd, 03.67.−a

*Now with Thales Laser Japan.

 
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