Simulation of integrated photonic gates

TL;DR

This paper introduces an algorithm for designing integrated photonic quantum gates that can implement arbitrary unitary transformations with high fidelity, advancing the development of compact, robust quantum photonic devices.

Contribution

The paper presents a novel algorithm for designing integrated photonic devices that realize any n-mode quantum transformation, enabling custom, high-fidelity quantum gates.

Findings

Designed photonic devices implementing quantum gates with high fidelity

Algorithm capable of transforming any n-mode unitary into a physical device

Potential for creating compact, robust quantum photonic components

Abstract

Quantum technologies, such as quantum communication, sensing and imaging, need a platform which is flexible, miniaturizable and works at room temperature. Integrated photonics is a promising and fast-developing platform. This requires to develop the right tools to design and fabricate arbitrary photonic quantum devices. Here we present an algorithm which, starting from a $n$-mode transformation $U$, designs a photonic device implementing $U$. Using this method we design integrated photonic devices which implement quantum gates with high fidelity. Apart from quantum computation, future applications include the design of photonic subroutines or embedded quantum devices. These custom-designed photonic devices will implement in a single step a given algorithm and will be small, robust and fast compared to a fully-programmable processor.