Time-Domain Universal Linear-Optical Operations for Universal Quantum Information Processing

TL;DR

This paper presents a scalable, programmable time-domain optical circuit capable of performing universal three-mode linear operations, advancing the development of large-scale quantum information processing with optical systems.

Contribution

It introduces a dual-loop optical circuit for universal quantum information processing that is scalable, programmable, and capable of implementing multiple three-mode operations in the time domain.

Findings

Successfully demonstrated nine different three-mode operations.

Confirmed entanglement in the output states.

Circuit scalability and potential for universal quantum computing.

Abstract

We demonstrate universal and programmable three-mode linear optical operations in the time domain by realizing a scalable dual-loop optical circuit suitable for universal quantum information processing (QIP). The programmability, validity, and deterministic operation of our circuit are demonstrated by performing nine different three-mode operations on squeezed-state pulses, fully characterizing the outputs with variable measurements, and confirming their entanglement. Our circuit can be scaled up just by making the outer loop longer and also extended to universal quantum computers by incorporating feedforward systems. Thus, our work paves the way to large-scale universal optical QIP.