A non-Markovian optical signature for detecting entanglement in coupled excitonic qubits

TL;DR

This paper proposes a novel optical signature based on non-Markovian effects in emitted light to detect entanglement in coupled excitonic qubits, even amidst environmental noise.

Contribution

It introduces a non-Markovian optical signature for entanglement detection in nanostructure systems, validated through correlation function calculations under various excitation conditions.

Findings

The optical signature reveals entanglement in coupled excitonic qubits.

The signature persists despite environmental noise.

Correlation functions encode entanglement information.

Abstract

We identify an optical signature for detecting entanglement in experimental nanostructure systems comprising coupled excitonic qubits. This signature owes its strength to non-Markovian dynamical effects in the second-order temporal coherence function of the emitted radiation. We calculate autocorrelation and cross-correlation functions for both selective and collective light excitation, and prove that the coherence properties of the emitted light do indeed carry information about the entanglement of the initial multi-qubit state. We also show that this signature can survive in the presence of a noisy environment.