Delaying two-photon Fock-states in a hot cesium vapor using on-demand generated single-photons from a semiconductor quantum dot

TL;DR

This paper demonstrates the use of hot cesium vapor's slow-light effect to delay one- and two-photon Fock-states generated from a quantum dot, achieving significant delays with high transmission for quantum photonic applications.

Contribution

It introduces a method to delay higher-order Fock-states using hot cesium vapor, combining solid-state photon sources with atomic vapor for quantum information processing.

Findings

Achieved a delay of five times the initial photon length.

Maintained high transmission (~90%) during delay.

Verified propagation and delay of one- and two-photon Fock-states.

Abstract

Single photons from solid-state quantum emitters are playing a crucial role in the development of photonic quantum technologies. Higher order states, such as N-photon Fock-states allow for applications e.g. in quantum-enhanced sensing. In this study, we utilize the dispersion of a hot cesium vapor at the D1 lines to realize a temporal delay for one and two-photon Fock-states as a result of the slow-light effect. Single photons are generated on-demand from an InGaAs quantum dot, while their quantum interference at a beam splitter is used to generate a two-photon Fockstate. We verify the successful propagation and temporal delay of both the one and two-photon Fock-states, while a significant delay (5x initial photon length) with simultaneous high transmission (~90 %) is achieved.