Induced cavities for photonic quantum gates

TL;DR

This paper explores how optically-induced cavities in atomic media can enhance photonic quantum gates by mitigating traditional limitations, leading to improved gate fidelity in long media.

Contribution

It demonstrates that induced cavities can overcome blockade optical depth limits, using the medium's total optical depth as a resource for better quantum gate performance.

Findings

Induced cavities increase the effective finesse of atomic media.

Gate infidelity is reduced with the integration of induced cavities.

Long media benefit from the induced cavity approach, improving quantum gate operation.

Abstract

Effective cavities can be optically-induced in atomic media and employed to strengthen optical nonlinearities. Here we study the integration of induced cavities with a photonic quantum gate based on Rydberg blockade. Accounting for loss in the atomic medium, we calculate the corresponding finesse and gate infidelity. Our analysis shows that the conventional limits imposed by the blockade optical depth are mitigated by the induced cavity in long media, thus establishing the total optical depth of the medium as a complementary resource.