Dynamic-Disorder-Induced Enhancement of Entanglement in Photonic Quantum Walks

TL;DR

This paper experimentally demonstrates that dynamic disorder in quantum walks can enhance entanglement, independent of initial states, offering insights for quantum computing applications.

Contribution

It provides the first experimental evidence that dynamic disorder enhances entanglement in quantum walks, differing from traditional Hadamard walk behaviors.

Findings

Entanglement is enhanced by dynamic disorder in quantum walks.

Enhanced entanglement is independent of initial states.

Results suggest potential for quantum computing applications.

Abstract

Entanglement generation in discrete time quantum walks is deemed to be another key property beyond the transport behaviors. The latter has been widely used in investigating the localization or topology in quantum walks. However, there are few experiments involving the former for the challenges in full reconstruction of the final wave function. Here, we report an experiment demonstrating the enhancement of the entanglement in quantum walks using dynamic disorder. Through reconstructing the local spinor state for each site, von Neumann entropy can be obtained and used to quantify the coin-position entanglement. We find that the enhanced entanglement in the dynamically disordered quantum walks is independent of the initial state, which is different from the entanglement generation in the Hadamard quantum walks. Our results are inspirational for achieving quantum computing based on quantum walks.