Continuous monitoring can improve single-photon probability

TL;DR

This paper proposes a continuous monitoring and change detection method to enhance the probability of single-photon emission in quantum-dot sources, especially effective in weak coupling regimes with electrical pumping.

Contribution

It introduces a novel technique combining continuous quantum measurement and change detection algorithms to optimize single-photon emission probability.

Findings

Improved single-photon probability using continuous monitoring.

Effective in weak coupling and electrical pumping regimes.

Provides a practical approach for quantum-dot single-photon sources.

Abstract

An engineering technique using continuous quantum measurement together with a change detection algorithm is proposed to improve the probability of single photon emission for a quantum-dot based single-photon source. The technique involves continuous monitoring of the emitter, integrating the measured signal, and a simple change detection circuit to decide when to stop pumping. The idea is to pump just long enough such that the emitter $+$ cavity system is in a state that can emit at most one photon with high probability. Continuous monitoring provides partial information on the state of the emitter. This technique is useful when the system is operating in the weak coupling regime, and the rate of pumping is smaller than, or comparable to, the emitter-cavity coupling strength, as can be the case for electrical pumping.