Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory. Sprague, M., England, D. d, Abdolvand, A., Nunn, J., Jin, X., Steven Kolthammer, W., Barbieri, M., Rigal, B., Michelberger, P., Champion, T., Russell, P., & Walmsley, I. New Journal of Physics, 2013.
Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory [link]Paper  doi  abstract   bibtex   
The generation of large multiphoton quantum states - for applications in computing, metrology and simulation - requires a network of high-efficiency quantum memories capable of storing broadband pulses. Integrating these memories into a fibre offers a number of advantages towards realizing this goal: strong light-matter coupling at low powers, simplified alignment and compatibility with existing photonic architectures. Here, we introduce a large-core kagome-structured hollow-core fibre as a suitable platform for an integrated fibre-based quantum memory with a warm atomic vapour. We demonstrate, for the first time, efficient optical pumping in such a system, where 90 ± 1% of atoms are prepared in the ground state. We measure high optical depths (3 × 104) and narrow homogeneous linewidths (6 ± 2 MHz) that do not exhibit significant transit-time broadening, showing that we can prepare a Λ-level system in a pure state. Our results establish that kagome fibres are suitable for implementing a broadband, room-temperature quantum memory, as well as a range of nonlinear optical effects. © IOP Publishing and Deutsche Physikalische Gesellschaft.
@Article{Sprague2013a,
  author        = {Sprague, M.R.a , England, D.G.a d , Abdolvand, A.b , Nunn, J.a , Jin, X.-M.a , Steven Kolthammer, W.a , Barbieri, M.a , Rigal, B.c , Michelberger, P.S.a , Champion, T.F.M.a , Russell, P.S.J.b , Walmsley, I.A.a},
  journal       = {New Journal of Physics},
  title         = {Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory},
  year          = {2013},
  volume        = {15},
  abstract      = {The generation of large multiphoton quantum states - for applications in computing, metrology and simulation - requires a network of high-efficiency quantum memories capable of storing broadband pulses. Integrating these memories into a fibre offers a number of advantages towards realizing this goal: strong light-matter coupling at low powers, simplified alignment and compatibility with existing photonic architectures. Here, we introduce a large-core kagome-structured hollow-core fibre as a suitable platform for an integrated fibre-based quantum memory with a warm atomic vapour. We demonstrate, for the first time, efficient optical pumping in such a system, where 90 ± 1% of atoms are prepared in the ground state. We measure high optical depths (3 × 104) and narrow homogeneous linewidths (6 ± 2 MHz) that do not exhibit significant transit-time broadening, showing that we can prepare a Λ-level system in a pure state. Our results establish that kagome fibres are suitable for implementing a broadband, room-temperature quantum memory, as well as a range of nonlinear optical effects. © IOP Publishing and Deutsche Physikalische Gesellschaft.},
  affiliation   = {Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU Oxford, United Kingdom; Max Planck Institute for the Science of Light, Guenther-Scharowsky Straße 1, D-91058 Erlangen, Germany; École Polytechnique, Route de Saclay, 91120 Palaiseau, France; National Research Council Canada, 100 Sussex Drive, Ottawa K1A 0R6, Canada},
  art_number    = {055013},
  document_type = {Article},
  doi           = {10.1088/1367-2630/15/5/055013},
  source        = {Scopus},
  timestamp     = {2016.03.02},
  url           = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84878222338&partnerID=40&md5=c5c6ac0690dd9dc23aec09903962e05d},
}

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