Noncommutative metasurfaces enabled diverse quantum path entanglement of structured photons

TL;DR

This paper introduces a novel method using noncommutative metasurfaces to generate and control diverse quantum path entangled states of structured photons, enabling flexible manipulation of quantum entanglement across various Poincaré spheres.

Contribution

The work demonstrates a new approach to achieve and switch diverse quantum path entanglement using noncommutative metasurfaces and entangled photons, expanding quantum state control capabilities.

Findings

Diverse quantum path entanglement can be achieved with noncommutative metasurfaces.

Quantum path entanglement can be switched across different Poincaré spheres.

The method enables broad-spectrum tuning of quantum entangled states.

Abstract

Quantum entanglement, a fundamental concept in quantum mechanics, lies at the heart of many current and future quantum technologies. A pivotal task is generation and control of diverse quantum entangled states in a more compact and flexible manner. Here, we introduce an approach to achieve diverse path entanglement by exploiting the interaction between noncommutative metasurfaces and entangled photons. Different from other path entanglement, our quantum path entanglement is evolvement path entanglement of photons on Poincar\'e sphere. Due to quantum entanglement between idler photons and structured signal photons, evolvement path of idler photons on the fundamental Poincar\'e sphere can be nonlocally mirrored by structured signal photons on any high-order Poincar\'e sphere, resulting in quantum path entanglement. Benefiting from noncommutative metasurfaces, diverse quantum path entanglement can be switched across different higher-order Poincar\'e spheres using distinct combination sequences of metasurfaces. Our method allows for the tuning of diverse quantum path entanglement across a broad spectrum of quantum states, offering a significant advancement in the manipulation of quantum entanglement.