Path-controlled time reordering of paired photons in a dressed three-level cascade

TL;DR

This paper demonstrates how dressing a three-level quantum dot system enables control over the time ordering of emitted photon pairs, offering a versatile method for photon pair manipulation without post-processing.

Contribution

It introduces a novel approach to manipulate photon time ordering using spectral post-selection in a dressed three-level cascade system.

Findings

Time ordering can be removed or conserved through spectral post-selection.

Dressed three-level systems can generate orthogonally polarized, bunched, or antibunched photon pairs.

Experimental and theoretical results confirm the control over photon emission properties.

Abstract

The two-photon dressing of a "three-level ladder" system, here the ground state, the exciton and the biexciton of a semiconductor quantum dot, leads to new eigenstates and allows one to manipulate the time ordering of the paired photons without unitary post processing. We show that, after spectral post-selection of the single dressed states, the time ordering of the cascaded photons can be removed or conserved. Our joint experimental and theoretical study demonstrates the high potential of a "ladder" system to be a versatile source of orthogonally polarized, bunched or antibunched pairs of photons.