Single photon absorption by a single quantum emitter

TL;DR

This paper demonstrates that a three-level lambda quantum emitter can nearly perfectly absorb incident light if the light's focus matches the emitter's dipole emission pattern, enabling potential applications in quantum entanglement.

Contribution

It introduces a method for achieving near-unity absorption probability in a three-level quantum emitter through optimized focusing geometry.

Findings

Absorption probability approaches unity with proper focusing.

Realistic focusing geometries still enable high absorption.

Potential for long-distance entanglement of spin qubits.

Abstract

We show that a three-level lambda quantum emitter with equal spontaneous emission rates on both optically active transitions can absorb an incident light field with a probability approaching unity, provided that the focused light profile matches that of the emitter dipole emission pattern. Even with realistic focusing geometries, our results could find applications in long-distance entanglement of spin qubits.