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Proceedings Paper

Single-photon devices in quantum cryptography
Author(s): Wlodzimierz Nakwaski; Robert P. Sarzala; M. Wasiak; T. Czyszanowski; Pawel Mackowiak
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Paper Abstract

Modern communication in absolute secrecy requires creation of new intrinsically secure quantum communication channels. It is particularly necessary during the first connection between two parties establishing then in assumed unconditional security the secret cryptographic key which is supposed to be used afterwards during normal information exchanging. This new emerging field of quantum information technology is based on a new type of light sources, in which numbers of emitted photons can be carefully controlled. Especially advantageous are sources of single photons emitted at strictly predetermined moments, so called single-photon devices. Then any possible eavesdropper activity will be followed by some unavoidable disturbance which alerts both communication parties to an event. In the present paper, the Purcell effect associated with enhancement of spontaneous emission coupled to a resonator is explained, methods used to produce streams of antibunched photons are given, mechanisms applied to control carrier injection into quantum dots are shown and some possible designs of single-photon devices are presented and described. These devices are based on taking advantage of both the Purcell effect and the atom-like energy spectrum of quantum dots.

Paper Details

Date Published: 22 October 2003
PDF: 8 pages
Proc. SPIE 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics, (22 October 2003); doi: 10.1117/12.519752
Show Author Affiliations
Wlodzimierz Nakwaski, Technical Univ. of Lodz (Poland)
CHTM, Univ. of New Mexico (United States)
Robert P. Sarzala, Technical Univ. of Lodz (Poland)
M. Wasiak, Technical Univ. of Lodz (Poland)
T. Czyszanowski, Technical Univ. of Lodz (Poland)
Pawel Mackowiak, Technical Univ. of Lodz (Poland)

Published in SPIE Proceedings Vol. 5136:
Solid State Crystals 2002: Crystalline Materials for Optoelectronics
Jaroslaw Rutkowski; Antoni Rogalski, Editor(s)

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