Heralded entanglement of two distant quantum dot spins via optical interference

TL;DR

This paper proposes a method to generate heralded entanglement between two distant quantum dots using optical interference, without requiring direct qubit coupling or identical quantum dot properties.

Contribution

It introduces a novel scheme leveraging the Hong–Ou–Mandel effect for entangling quantum dots with high success probability without single-photon detection or identical quantum dots.

Findings

Achieves near-unit success probability for entanglement

Does not require direct coupling between quantum dots

Works without identical quantum dot frequencies

Abstract

We present a proposal for heralded entanglement between two quantum dots via Hong--Ou--Mandel effect. Each of the quantum dots, drived off-resonance by two lasers, can be entangled with the coherent cavity mode. The output photons from the two coherent cavity modes interfering by a beamsplitter, we could entangle the two QDs with nearly unit success probability. Our scheme requires neither direct coupling between qubits nor the detection of single photons. Moreover the quantum dots do not need to have the same frequencies and coupling constants.