Experimental certification of millions of genuinely entangled atoms in a solid

Florian Fröwis (), Peter C. Strassmann, Alexey Tiranov, Corentin Gut, Jonathan Lavoie, Nicolas Brunner, Félix Bussières, Mikael Afzelius and Nicolas Gisin
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Florian Fröwis: Université de Genève
Peter C. Strassmann: Université de Genève
Alexey Tiranov: Université de Genève
Corentin Gut: Université de Genève
Jonathan Lavoie: Université de Genève
Nicolas Brunner: Université de Genève
Félix Bussières: Université de Genève
Mikael Afzelius: Université de Genève
Nicolas Gisin: Université de Genève

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Quantum theory predicts that entanglement can also persist in macroscopic physical systems, albeit difficulties to demonstrate it experimentally remain. Recently, significant progress has been achieved and genuine entanglement between up to 2900 atoms was reported. Here, we demonstrate 16 million genuinely entangled atoms in a solid-state quantum memory prepared by the heralded absorption of a single photon. We develop an entanglement witness for quantifying the number of genuinely entangled particles based on the collective effect of directed emission combined with the non-classical nature of the emitted light. The method is applicable to a wide range of physical systems and is effective even in situations with significant losses. Our results clarify the role of multipartite entanglement in ensemble-based quantum memories and demonstrate the accessibility to certain classes of multipartite entanglement with limited experimental control.

Date: 2017
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DOI: 10.1038/s41467-017-00898-6

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