Triggered single photons and entangled photons from a quantum dot microcavity |
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| Authors: | M. Pelton C. Santori G.S. Solomon O. Benson Y. Yamamoto |
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| Affiliation: | 1.Quantum Entanglement Project, ICORP, JST, E. L. Ginzton Laboratory, Stanford University, Stanford CA-94305, USA,US;2.Physics Department, University of Konstanz, Universit?tsstrasse 10, 78464 Konstanz, Germany,DE |
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| Abstract: | Current quantum cryptography systems are limited by the attenuated coherent pulses they use as light sources: a security loophole is opened up by the possibility of multiple-photon pulses. By replacing the source with a single-photon emitter, transmission rates of secure information can be improved. We have investigated the use of single self-assembled InAs/GaAs quantum dots as such single-photon sources, and have seen a tenfold reduction in the multi-photon probability as compared to Poissonian pulses. An extension of our experiment should also allow for the generation of triggered, polarization-entangled photon pairs. The utility of these light sources is currently limited by the low efficiency with which photons are collected. However, by fabricating an optical microcavity containing a single quantum dot, the spontaneous emission rate into a single mode can be enhanced. Using this method, we have seen 78% coupling of single-dot radiation into a single cavity resonance. The enhanced spontaneous decay should also allow for higher photon pulse rates, up to about 3 GHz. Received 8 July 2001 and Received in final form 25 August 2001 |
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| Keywords: | PACS. 78.67.Hc Quantum dots – 42.50.Dv Nonclassical field states squeezed, antibunched, and sub-Poissonian states operational definitions of the phase of the field phase measurements – 73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems |
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