Scalable, chip-based optically-controlled gates for quantum information processing

TL;DR

This paper introduces a scalable, chip-based method for dynamically controlling quantum gates using photonic exchange and nonlinear optical effects, enabling flexible quantum information processing.

Contribution

It presents a novel approach to building on-the-fly configurable quantum gates using Bragg gratings and the Kerr effect, advancing quantum photonic integration.

Findings

Demonstrates a mechanism for dynamic control of quantum gates.

Shows how nonlinear phase shifts can modulate photon transmission.

Provides a protocol example for quantum logic gates.

Abstract

Here we present a simple and robust method to build on-the-fly configurable quantum gates based on a photonic exchange between quantum nodes. The idea is based on a high reflectivity of Bragg grating structures near resonant wavelengths. The control is exerted by applying an external strongly off-resonant or even a static electromagnetic field and taking advantage of the Kerr effect. When the nonlinear phase shift is strong enough, the Bragg mirror disappears, thereby allowing a transmission of a wave packet from one node to another. An example of a protocol for quantum logic gates that relies on this framework is offered.