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.

Interferometric imaging of amplitude and phase of spatial biphoton states / Zia, Danilo; Dehghan, Nazanin; D’Errico, Alessio; Sciarrino, Fabio; Karimi, Ebrahim. - In: NATURE PHOTONICS. - ISSN 1749-4885. - 17:11(2023), pp. 1009-1016. [10.1038/s41566-023-01272-3]

Interferometric imaging of amplitude and phase of spatial biphoton states

Danilo Zia
Primo
;
Fabio Sciarrino
Penultimo
;
2023

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.
2023
quantum optics; quantum Imaging; quantum information; digital holography; orbital angular momentum
01 Pubblicazione su rivista::01a Articolo in rivista
Interferometric imaging of amplitude and phase of spatial biphoton states / Zia, Danilo; Dehghan, Nazanin; D’Errico, Alessio; Sciarrino, Fabio; Karimi, Ebrahim. - In: NATURE PHOTONICS. - ISSN 1749-4885. - 17:11(2023), pp. 1009-1016. [10.1038/s41566-023-01272-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1692986
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