Quantum Transduction of Telecommunications-band Single Photons from a Quantum Dot by Frequency Upconversion

Details Quantum Transduction of Telecommunications-band Single Photons from a Quantum Dot by Frequency Upconversion Quantum Transduction of Telecommunications-band Single Photons from a Quantum Dot by Frequency Upconversion

2010-04-15

arxiv.org/abs/1004.2686v2

Nature Photonics 4, 786-791 (2010)

Physics

Quantum Physics

7 pages, 4 figures

Scientific paper

10.1038/nphoton.2010.221

The ability to transduce non-classical states of light from one wavelength to another is a requirement for integrating disparate quantum systems that take advantage of telecommunications-band photons for optical fiber transmission of quantum information and near-visible, stationary systems for manipulation and storage. In addition, transducing a single-photon source at 1.3 {\mu}m to visible wavelengths for detection would be integral to linear optical quantum computation due to the challenges of detection in the near-infrared. Recently, transduction at single-photon power levels has been accomplished through frequency upconversion, but it has yet to be demonstrated for a true single-photon source. Here, we transduce the triggered single-photon emission of a semiconductor quantum dot at 1.3 {\mu}m to 710 nm with a total detection (internal conversion) efficiency of 21% (75%). We demonstrate that the 710 nm signal maintains the quantum character of the 1.3 {\mu}m signal, yielding a photon anti-bunched second-order intensity correlation, g^(2)(t), that shows the optical field is composed of single photons with g^(2)(0) = 0.165 < 0.5.

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