Real-time ghost imaging of Bell-nonlocal entanglement between a photon and a quantum memory

Mateusz Mazelanik1,2, Adam Leszczyński1,2, Michał Lipka1,2, Wojciech Wasilewski1, and Michał Parniak1,3

1Centre for Quantum Optical Technologies, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
2Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
3Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

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Certification of nonlocality of quantum mechanics is an important fundamental test that typically requires prolonged data collection and is only revealed in an in-depth analysis. These features are often particularly exposed in hybrid systems, such as interfaces between light and atomic ensembles. Certification of entanglement from images acquired with single-photon camera can mitigate this issue by exploiting multiplexed photon generation. Here we demonstrate this feature in a quantum memory (QM) operating in a real-time feedback mode. Through spatially-multimode spin-wave storage the QM enables operation of the real-time ghost imaging (GI) protocol. By properly preparing the spatial phase of light emitted by the atoms we enable observation of Bell-type nonlocality from a single image acquired in the far field as witnessed by the Bell parameter of $S=2.227\pm0.007>2$. Our results are an important step towards fast and efficient utilization of multimode quantum memories both in protocols and in fundamental tests.

Quantum ghost imaging is a peculiar phenomenon in which entangled photons are used to create an image of an object with photos that never even interact with this object. Spatial entanglement is the key, but additionally, post-measurement analysis of registered correlations is required to reconstruct the image. In our new, refined method, we employ a quantum memory that stores light to remove the post-selection stage and obtain images in real-time. We demonstrate the true quantum behaviour witnessed with Bell inequalities, certifying entanglement of the memory and photons. Our work provides a fast and efficient framework for utilizing quantum correlations in imaging, as well as for proving quantum behaviour of a hybrid light-matter systems.

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Cited by

[1] Erhan Saglamyurek, "Atomic quantum memories boost quantum imaging and sensing", Quantum Views 5, 58 (2021).

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