Experimental optimal verification of three-dimensional entanglement on a silicon chip

TL;DR

This paper demonstrates an optimal method for verifying three-dimensional entanglement on a silicon chip, achieving high confidence and surpassing standard quantum limits, which advances practical quantum device validation.

Contribution

It experimentally implements an optimal quantum verification strategy for high-dimensional entanglement on integrated silicon photonic chips, improving reliability assessment methods.

Findings

95% confidence from 1190 copies

Scaling of infidelity exceeds standard quantum limit

Verification method is efficient for complex quantum states

Abstract

High-dimensional entanglement is significant for the fundamental studies of quantum physics and offers unique advantages in various quantum information processing (QIP) tasks. Integrated quantum devices have recently emerged as a promising platform for creating, processing, and detecting complex high-dimensional entangled states. A crucial step towards practical quantum technologies is to verify that these devices work reliably with an optimal strategy. In this work, we experimentally implement an optimal quantum verification strategy on a three-dimensional maximally entangled state using local projective measurements on a silicon photonic chip. A 95% confidence is achieved from 1190 copies to verify the target quantum state. The obtained scaling of infidelity as a function of the number of copies is -0.5497+-0.0002, exceeding the standard quantum limit of -0.5 with 248 standard deviations. Our results indicate that quantum state verification could serve as an efficient tool for complex quantum measurement tasks.