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

• URL: http://arxiv.org/abs/2102.11805v2
• Date: Mon, 28 Jun 2021 17:09:07 GMT
• Title: Real-time ghost imaging of Bell-nonlocal entanglement between a photon and a quantum memory
• Authors: Mateusz Mazelanik, Adam Leszczyski, Micha{\l} Lipka, Wojciech Wasilewski, Micha{\l} Parniak
• Abstract summary: certification of entanglement from images acquired with single-photon camera can mitigate this issue. We demonstrate this feature in a quantum memory operating in a real-time feedback mode.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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