Triggered single photons and entangled photons from a quantum dot microcavity

被引：0
|
作者：
M. Pelton
C. Santori
G.S. Solomon
O. Benson
Y. Yamamoto
机构：
[1] Quantum Entanglement Project,
[2] ICORP,undefined
[3] JST,undefined
[4] E. L. Ginzton Laboratory,undefined
[5] Stanford University,undefined
[6] Stanford CA-94305,undefined
[7] USA,undefined
[8] Solid-State Photonics Laboratory,undefined
[9] Stanford University,undefined
[10] Stanford CA-94305,undefined
[11] USA,undefined
[12] Physics Department,undefined
[13] University of Konstanz,undefined
[14] Universitätsstrasse 10,undefined
[15] 78464 Konstanz,undefined
[16] Germany,undefined
[17] NTT Basic Research Laboratories,undefined
[18] Atsugishi,undefined
[19] Kanagawa,undefined
[20] Japan,undefined
来源：
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics | 2002年 / 18卷
关键词：
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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摘要：
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.
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页码：179 / 190
页数：11
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