Quantum Interference Induced Photon Blockade in a Coupled Single Quantum Dot-Cavity System

TL;DR

This paper proposes a quantum interference-based scheme to achieve strong photon blockade in a quantum dot-cavity system, enhancing photon control for quantum computing applications without requiring strong coupling.

Contribution

It introduces a novel interference mechanism to enhance photon blockade in a coupled quantum dot-cavity system, reducing the need for strong coupling and tolerating dephasing effects.

Findings

Significant reduction in $g^{(2)}(0)$ by two orders of magnitude.

Photon blockade can be controlled via phase and Rabi coupling tuning.

The scheme works effectively even with pure dephasing and weak coupling.

Abstract

We propose an experimental scheme to implement a strong photon blockade with a single quantum dot coupled to a nanocavity. The photon blockade effect can be tremendously enhanced by driving the cavity and the quantum dot simultaneously with two classical laser fields. This enhancement of photon blockade is ascribed to the quantum interference effect to avoid two-photon excitation of the cavity field. Comparing with Jaynes-Cummings model, the second-order correlation function at zero time delay $g^{(2)}(0)$ in our scheme can be reduced by two orders of magnitude and the system sustains a large intracavity photon number. A red (blue) cavity-light detuning asymmetry for photon quantum statistics with bunching or antibunching characteristics is also observed. The photon blockade effect has a controllable flexibility by tuning the relative phase between the two pumping laser fields and the Rabi coupling strength between the quantum dot and the pumping field. Moreover, the photon blockade scheme based on quantum interference mechanism does not require a strong coupling strength between the cavity and the quantum dot, even with the pure dephasing of the system. This simple proposal provides an effective way for potential applications in solid state quantum computation and quantum information processing.