Quantum stochastic resonance in a single-photon emitter

TL;DR

This paper demonstrates quantum stochastic resonance in a single-photon emitter, showing how quantum noise can enhance weak signals in quantum dot systems, with potential implications for quantum information technology.

Contribution

It provides the first experimental observation of quantum stochastic resonance in a single-photon emitter using full counting statistics and factorial cumulants.

Findings

Quantum stochastic resonance observed in single-electron tunneling dynamics.

Resonance identified through Fano factor and factorial cumulants analysis.

Enhanced understanding of quantum noise effects in quantum dot emitters.

Abstract

Stochastic resonance is a phenomenon in which fluctuations enhance an otherwise weak signal. It has been found in many different systems in paleoclimatology, biology, medicine, and physics. The classical stochastic resonance due to thermal noise has recently been experimentally extended to the quantum regime, where the fundamental randomness of individual quantum events provides the noise source. Here, we demonstrate quantum stochastic resonance in the single-electron tunneling dynamics of a periodically driven single-photon emitter, consisting of a self-assembled quantum dot that is tunnel-coupled to an electron reservoir. Such highly-controllable quantum emitters are promising candidates for future applications in quantum information technologies. We monitor the charge dynamics by resonant optical excitation and identify quantum stochastic resonance with the help of full counting statistics of tunneling events in terms of the Fano factor and extend the statistical evaluation to factorial cumulants to gain a deeper understanding of this far-reaching phenomenon.