Generation of two identical photons from a quantum dot in a microcavity

TL;DR

This paper proposes a method to generate two identical photons using a quantum dot in a polarized cavity, with enhanced emission efficiency suitable for experimental realization.

Contribution

It introduces a novel scheme for two-photon emission from a quantum dot in a cavity, leveraging biexciton resonance and cavity tuning for efficient photon pair production.

Findings

Emission can be Purcell enhanced by several orders of magnitude.

The scheme produces a highly polarized, monochromatic, and directional two-photon beam.

Feasible with current experimental systems.

Abstract

We propose and characterize a two-photon emitter in a highly polarised, monochromatic and directional beam, realized by means of a quantum dot embedded in a linearly polarized cavity. In our scheme, the cavity frequency is tuned to half the frequency of the biexciton (two excitons with opposite spins) and largely detuned from the excitons thanks to the large biexciton binding energy. We show how the emission can be Purcell enhanced by several orders of magnitude into the two-photon channel for available experimental systems.