Quantifying high-dimensional spatial entanglement with a single-photon-sensitive time-stamping camera

Author:

Courme Baptiste12,Vernière Chloé1,Svihra Peter34ORCID,Gigan Sylvain2ORCID,Nomerotski Andrei5ORCID,Defienne Hugo1ORCID

Affiliation:

1. Sorbonne Université

2. Sorbonne Universite

3. Czech Technical University

4. CERN

5. Brookhaven National Laboratory

Abstract

High-dimensional entanglement is a promising resource for quantum technologies. Being able to certify it for any quantum state is essential. However, to date, experimental entanglement certification methods are imperfect and leave some loopholes open. Using a single-photon-sensitive time-stamping camera, we quantify high-dimensional spatial entanglement by collecting all output modes and without background subtraction, two critical steps on the route toward assumptions-free entanglement certification. We show position-momentum Einstein–Podolsky–Rosen (EPR) correlations and quantify the entanglement of formation of our source to be larger than 2.8 along both transverse spatial axes, indicating a dimension higher than 14. Our work overcomes important challenges in photonic entanglement quantification and paves the way toward the development of practical quantum information processing protocols based on high-dimensional entanglement.

Funder

Brookhaven National Laboratory

Centrum pokročilých aplikovaných přírodních věd

European Research Council

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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