Controlled-NOT gate operating with single photons

TL;DR

This paper demonstrates a two-qubit controlled-NOT gate using indistinguishable photons from a quantum dot, advancing integrated optical quantum computing with semiconductor components.

Contribution

It presents the first implementation of a CNOT gate with single photons from a quantum dot integrated in a semiconductor platform.

Findings

Successful demonstration of a two-qubit CNOT gate

Use of indistinguishable photons from a quantum dot

Potential for fully integrated scalable quantum devices

Abstract

The initial proposal for scalable optical quantum computing required single photon sources, linear optical elements such as beamsplitters and phaseshifters, and photon detection. Here we demonstrate a two qubit gate using indistinguishable photons from a quantum dot in a pillar microcavity. As the emitter, the optical circuitry, and the detectors are all semiconductor, this is a promising approach towards creating a fully integrated device for scalable quantum computing.