Interferometric imaging of amplitude and phase of spatial biphoton states

From National Research Council Canada

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DOI	Resolve DOI: https://doi.org/10.1038/s41566-023-01272-3
Author	Search for: Zia, Danilo ORCID identifier: https://orcid.org/0000-0002-9008-5858; Search for: Dehghan, Nazanin; Search for: D'Errico, Alessio ORCID identifier: https://orcid.org/0000-0002-6964-4328; Search for: Sciarrino, Fabio ORCID identifier: https://orcid.org/0000-0003-1715-245X; Search for: Karimi, Ebrahim¹ORCID identifier: https://orcid.org/0000-0002-8168-7304
Affiliation	National Research Council of Canada. Quantum and Nanotechnologies
Format	Text, Article
Abstract	High-dimensional biphoton states are promising resources for quantum applications, ranging from high-dimensional quantum communications to quantum imaging. A pivotal task is fully characterizing these states, which is generally time-consuming and not scalable when projective measurement approaches are adopted; however, new advances in coincidence imaging technologies allow for overcoming these limitations by parallelizing multiple measurements. Here we introduce biphoton digital holography, in analogy to off-axis digital holography, where coincidence imaging of the superposition of an unknown state with a reference state is used to perform quantum state tomography. We apply this approach to single photons emitted by spontaneous parametric down-conversion in a nonlinear crystal when the pump photons possess various quantum states. The proposed reconstruction technique allows for a more efficient (three orders of magnitude faster) and reliable (an average fidelity of 87%) characterization of states in arbitrary spatial modes bases, compared with previously performed experiments. Multiphoton digital holography may pave the route toward efficient and accurate computational ghost imaging and high-dimensional quantum information processing.
Publication date	2023-08-14
Publisher	Nature Research
Licence	Creative Commons, Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
In	Nature Photonics 17, no. 11 (14 August 2023): 1009–1016.
Note	Erratum published in volume 17, issue 11, page 1018, 25 October 2023. DOI: 10.1038/s41566-023-01337-3
Language	English
Peer reviewed	Yes
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Record identifier	b19cfece-67dd-4b41-b586-de2ebc703163
Record created	2024-04-26
Record modified	2024-12-09

Date modified:: 2025-11-16