Coherent generation of the complete high-dimensional Bell basis by adaptive pump modulation

TL;DR

This paper introduces an adaptive pump modulation technique to efficiently generate complete high-dimensional Bell basis states, enabling advanced quantum information processing with high fidelity.

Contribution

The authors demonstrate a novel adaptive pump modulation method for preparing high-dimensional Bell states, simplifying implementation compared to traditional quantum gate approaches.

Findings

Successfully created four-dimensional orbital angular momentum Bell states

Achieved high fidelities in entanglement certification

Generalizable approach for complex quantum state preparation

Abstract

The Bell basis, a set of maximally entangled biphoton state, is a critical prerequisite towards quantum information processing, and many quantum applications have highlighted the requirement for the manipulation of high-dimensional Bell basis. While the Bell states can be created by using ingenious single-photon quantum gates, its implementation complexity in higher dimensions is significantly increased. Here we present an elaborate approach to show that the adaptive pump modulation enable the efficient preparation of Bell basis in arbitrary-dimensional Hilbert space. A complete set of four-dimensional orbital angular momentum Bell states are experimentally created, yielding high fidelities for certifying the entanglement dimensionality. Our strategy can be simply generalized to prepare more complex forms of quantum states even exploiting other physical degrees of freedom. Also, it can facilitate the use of high-dimensional entanglement in a variety of quantum protocols, in particular those requiring quantum dense coding.