A chiral route to spontaneous entanglement generation

TL;DR

This paper demonstrates that chiral coupling in waveguides significantly enhances spontaneous entanglement between qubits, offering a robust and practical approach for quantum entanglement generation.

Contribution

It introduces a chiral coupling scheme that increases entanglement and is resilient to qubit property variations, improving upon non-chiral methods.

Findings

Maximum concurrence increases by a factor of approximately 1.5 with chiral coupling.

Entanglement robustness against qubit detuning and separation.

Chiral waveguides enable more practical quantum entanglement protocols.

Abstract

We study the generation of spontaneous entanglement between two qubits chirally coupled to a waveguide. The maximum achievable concurrence is demonstrated to increase by a factor of $4/e \sim 1.5$ as compared to the non-chiral coupling situation. The proposed entanglement scheme is shown to be robust against variation of the qubit properties such as detuning and separation, which are critical in the non-chiral case. This result relaxes the restrictive requirements of the non-chiral situation, paving the way towards a realistic implementation. Our results demonstrate the potential of chiral waveguides for quantum entanglement protocols.