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A New Source of Quantum Light

Mar 8, 2016


This image represents three sources of single photons: represented by a red dot at the center of the cavity, the semiconductor quantum dots (of nanometric size) is inserted in the center of the cavity, which consists of a 3 µm pillar connected to a circular frame by guides that are 1.3 µm wide. By applying electrical voltage to the cavity, the wavelength of the emitted photons can be tuned and the charge noise totally eliminated. © Niccolo Somaschi – Laboratoire de photonique et de nanostructures (CNRS)

A new ultra-bright source of single photons - 15 times brighter than commonly used sources and emitting photons that are 99.5% indistinguishable from one another - has been developed by researchers from the CNRS, Université Paris Diderot, and Université Paris-Sud1.

This feat was achieved thanks to the nanometrically-precise positioning of a quantum dot within an optical microcavity.

Adding an electrical control to the device helped reduce the "noise" around the quantum dot, which generally renders photons different from one another.

Obtained in collaboration with researchers from Brisbane (Australia), these results make it possible to conduct quantum computing of unprecedented complexity, a first step toward the creation of optical quantum computers.

The results will be published in Nature Photonicson March 7, 2016.

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