Conditional phase shift from a quantum dot in a pillar microcavity

TL;DR

This paper demonstrates high-resolution reflection spectroscopy and measures the conditional phase shift induced by a quantum dot in a microcavity, advancing the development of spin-photon interfaces for quantum information processing.

Contribution

It provides experimental measurement of conditional phase shifts in a quantum dot-microcavity system, a step toward realizing spin-photon quantum interfaces.

Findings

Measured the change in reflectivity as the quantum dot is tuned through the cavity resonance.

Quantified the conditional phase shift induced by the quantum dot.

Showed potential extension to charged quantum dots for spin-photon interfaces.

Abstract

Large conditional phase shifts from coupled atom-cavity systems are a key requirement for building a spin photon interface. This in turn would allow the realisation of hybrid quantum information schemes using spin and photonic qubits. Here we perform high resolution reflection spectroscopy of a quantum dot resonantly coupled to a pillar microcavity. We show both the change in reflectivity as the quantum dot is tuned through the cavity resonance, and measure the conditional phase shift induced by the quantum dot using an ultra stable interferometer. These techniques could be extended to the study of charged quantum dots, where it would be possible to realise a spin photon interface.