Talk @UFRJ, Gabriel Aguilar (UFRJ), Monday 23/10, 15H30

The Quantum Optics and Information Group (UFRJ) is proud to announce next week’s seminar, which will be given by Gabriel Aguilar (UFRJ). We invite all to come!

See the details of the talk below:

MONDAY, October 23th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

“Entanglement between hundreds of macroscopic ensembles”
Gabriel Aguilar (UFRJ)

Abstract:
There are both fundamental and practical motivations for studying whether quantum entanglement can exist in macroscopic systems. However, multiparty entanglement is generally fragile and difficult to quantify. Dicke states are multiparty entangled states where a single excitation is delocalized over many systems. Building on previous work on quantum memories for photons, we create a Dicke state in a solid by storing a single photon in a crystal that contains many large atomic ensembles with distinct resonance frequencies. The photon is re-emitted at a well-defined time due to an interference effect analogous to multi-slit diffraction. We derive a lower bound for the number of entangled ensembles based on the contrast of the interference and the single-photon character of the input, and we experimentally demonstrate entanglement between over two hundred ensembles, each containing a billion atoms. We also illustrate the fact that each individual ensemble contains further entanglement​.

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