Coherent generation of nonclassical light on a chip via photon-induced tunneling and blockade

TL;DR

This paper demonstrates on-chip generation of nonclassical light using photon blockade and tunneling in a quantum dot-cavity system, with tunable regimes confirmed by correlation measurements.

Contribution

It reports the first experimental observation of switching between photon blockade and tunneling regimes in a photonic crystal cavity with a quantum dot.

Findings

Photon blockade observed with anti-bunching in correlations

Photon-induced tunneling observed with bunching in correlations

Transition between regimes controlled by laser tuning

Abstract

We report the observation of nonclassical light generated via photon blockade in a photonic crystal cavity with a strongly coupled quantum dot. By tuning the frequency of the probe laser with respect to the cavity and quantum dot resonance we can probe the system in either photon blockade or photon-induced tunneling regime. The transition from one regime to the other is confirmed by the measurement of the second order correlation that changes from anti-bunching to bunching.