Coherent-feedback control strategy to suppress spontaneous switching in ultra-low power optical bistability

TL;DR

This paper presents a quantum-optical feedback control method using Kerr nonlinear resonators to suppress spontaneous switching in ultra-low power optical bistability, enhancing stability for all-optical switching applications.

Contribution

It introduces a quantum-optical model of coupled Kerr resonators with a feedback loop, demonstrating autonomous suppression of spontaneous switching through numerical simulations.

Findings

Significantly reduces spontaneous switching rate

Enables ultra-low power all-optical switching

Provides a new control strategy for quantum optical systems

Abstract

An optical resonator with intracavity Kerr nonlinearity can exhibit dispersive bistability suitable for all-optical switching. With nanophotonic elements it may be possible to achieve attojoule switching energies, which would be very attractive for ultra-low power operation but potentially problematic because of quantum fluctuation-induced spontaneous switching. In this manuscript I derive a quantum-optical model of two Kerr-nonlinear ring resonators connected in a coherent feedback loop, and show via numerical simulation that a properly designed `controller' cavity can significantly reduce the spontaneous switching rate of a bistable `plant' cavity in a completely embedded and autonomous manner.