Paper
22 October 2003 Single-photon devices in quantum cryptography
Wlodzimierz Nakwaski, Robert P. Sarzala, M. Wasiak, T. Czyszanowski, Pawel Mackowiak
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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wlodzimierz Nakwaski, Robert P. Sarzala, M. Wasiak, T. Czyszanowski, and Pawel Mackowiak "Single-photon devices in quantum cryptography", Proc. SPIE 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics, (22 October 2003); https://doi.org/10.1117/12.519752
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Cited by 2 scholarly publications.
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KEYWORDS
Photons

Electrons

Quantum cryptography

Single photon

Quantum dots

Quantum wells

Resonators

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