Photon statistics of time dependent electronic excitation of spin injected quantum dots

TL;DR

This study explores how the shape of electrical pulses influences photon emission statistics in spin-injected quantum dots, revealing ways to optimize these devices for single-photon or higher-order photon generation.

Contribution

It demonstrates that electrical pulse shaping directly affects photon statistics in quantum dots, enabling tailored photon emission for quantum information applications.

Findings

Rising edge pulses increase higher-order photon states

Faster decay of higher-order photons compared to single photons

Pulse shape modification can optimize photon source performance

Abstract

The time dynamics of spin-injected, electrically contacted quantum dots were investigated with a focus on the time evolution of photon statistics. Photon statistics can provide insights into whether the device functions as an effective single-photon emitter or exhibits higher-order emissions. Through these investigations, we found that the shape of the electrical excitation pulse has a direct impact on photon statistics. Specifically, the rising edge of the pulse corresponds to a significantly higher number of higher-order photon states, which decay much faster than single photons associated with the falling edge of the electrical pulse. This relationship implies that the pulse shape can be tailored to optimize the device as either a better single-photon source or a generator of higher-order photon states, with potential applications in creating deterministic higher-order photon Fock states. The ability to easily modify the pulse shape is a unique feature of electrically excited quantum dots.