Entanglement between more than two hundred macroscopic atomic ensembles in a solid

Entanglement between more than two hundred macroscopic atomic ensembles in a solid. Zarkeshian, P., Deshmukh, C., Sinclair, N., Goyal, S., Aguilar, G., Lefebvre, P., Puigibert, M., Verma, V., Marsili, F., Shaw, M., Nam, S., Heshami, K., Oblak, D., Tittel, W., & Simon, C. Nature Communications, 2017.

Paper doi abstract bibtex

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. © 2017 The Author(s).

@Article{Zarkeshian2017,
  author        = {Zarkeshian, P. and Deshmukh, C. and Sinclair, N. and Goyal, S.K. and Aguilar, G.H. and Lefebvre, P. and Puigibert, M.G. and Verma, V.B. and Marsili, F. and Shaw, M.D. and Nam, S.W. and Heshami, K. and Oblak, D. and Tittel, W. and Simon, C.},
  journal       = {Nature Communications},
  title         = {Entanglement between more than two hundred macroscopic atomic ensembles in a solid},
  year          = {2017},
  number        = {1},
  volume        = {8},
  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. {\copyright} 2017 The Author(s).},
  affiliation   = {Institute for Quantum Science and Technology, Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada; National Institute of Standards and Technology, Boulder, CO, United States; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, United States; National Research Council of Canada, 100 Sussex Drive, Ottawa, ON, Canada},
  art_number    = {906},
  document_type = {Article},
  doi           = {10.1038/s41467-017-00897-7},
  groups        = {[paul:]},
  source        = {Scopus},
  timestamp     = {2018.07.12},
  url           = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85031702516&doi=10.1038%2fs41467-017-00897-7&partnerID=40&md5=908ab4fd49c99d99065af18814fdb9b6},
}

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