Precision requirements for spin-echo-based quantum memories

Precision requirements for spin-echo-based quantum memories. Heshami, K., Sangouard, N., MinÃ¡r, J., De Riedmatten, H. d, & Simon, C. Physical Review A - Atomic, Molecular, and Optical Physics, 2011.

Paper doi abstract bibtex

Spin-echo techniques are essential for achieving long coherence times in solid-state quantum memories for light because of inhomogeneous broadening of the spin transitions. It has been suggested that unrealistic levels of precision for the radio-frequency control pulses would be necessary for successful decoherence control at the quantum level. Here we study the effects of pulse imperfections in detail, using both a semiclassical and a fully quantum-mechanical approach. Our results show that high efficiencies and low noise-to-signal ratios can be achieved for the quantum memories in the single-photon regime for realistic levels of control pulse precision. We also analyze errors due to imperfect initial-state preparation (optical pumping), showing that they are likely to be more important than control pulse errors in many practical circumstances. These results are crucial for future developments of solid-state quantum memories. Â© 2011 American Physical Society.

@Article{Heshami2011a,
  author        = {Heshami, K.a , Sangouard, N.b , MinÃ¡r, J.b , De Riedmatten, H.c d , Simon, C.a},
  journal       = {Physical Review A - Atomic, Molecular, and Optical Physics},
  title         = {Precision requirements for spin-echo-based quantum memories},
  year          = {2011},
  number        = {3},
  volume        = {83},
  abstract      = {Spin-echo techniques are essential for achieving long coherence times in solid-state quantum memories for light because of inhomogeneous broadening of the spin transitions. It has been suggested that unrealistic levels of precision for the radio-frequency control pulses would be necessary for successful decoherence control at the quantum level. Here we study the effects of pulse imperfections in detail, using both a semiclassical and a fully quantum-mechanical approach. Our results show that high efficiencies and low noise-to-signal ratios can be achieved for the quantum memories in the single-photon regime for realistic levels of control pulse precision. We also analyze errors due to imperfect initial-state preparation (optical pumping), showing that they are likely to be more important than control pulse errors in many practical circumstances. These results are crucial for future developments of solid-state quantum memories. Â© 2011 American Physical Society.},
  affiliation   = {Institute for Quantum Information Science, Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada; Group of Applied Physics, University of Geneva, CH-1211 Geneva, Switzerland; ICFO-Institute of Photonic Sciences, Mediterranean Technology Park, ES-08860 Castelldefels (Barcelona), Spain; ICREA-InstituciÃ³ Catalana de Recerca i Estudis AvanÃ§ats, ES-08015 Barcelona, Spain},
  art_number    = {032315},
  document_type = {Article},
  doi           = {10.1103/PhysRevA.83.032315},
  source        = {Scopus},
  timestamp     = {2016.03.02},
  url           = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79952907548&partnerID=40&md5=9693ea5c21326e50f27133bdf5f1f840},
}

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