Single-photon-level optical storage in a solid-state spin-wave memory

Authors:N Timoney, I Usmani, P Jobez, M Afzelius, N Gisin
Journal:Phys. Rev. A 88, 022324 (2013)
DOI:http://dx.doi.org/10.1103/PhysRevA.88.022324
Abstract:A long-lived quantum memory is a firm requirement for implementing a quantum repeater scheme. Recent progress in solid-state rare-earth-ion-doped systems justifies their status as very strong candidates for such systems. Nonetheless an optical memory based on spin-wave storage at the single-photon level has not been shown in such a system to date, which is crucial for achieving the long storage times required for quantum repeaters. In this paper we show that it is possible to execute a complete atomic frequency comb (AFC) scheme, ̄ = 2.5 ± 0.6 photons per pulse. We discuss in detail including spin-wave storage, with weak coherent pulses of n the experimental steps required to obtain this result and demonstrate the coherence of a stored time-bin pulse. We show a noise level of (7.1 ± 2.3) × 10−3 photons per mode during storage, and this relatively low noise level paves the way for future quantum optics experiments using spin waves in rare-earth-doped crystals.
File:timoney2013a.pdf

BibTeX Source

@article{PhysRevA.88.022324,
  title = {Single-photon-level optical storage in a solid-state spin-wave memory},
  author = {Timoney, N. and Usmani, I. and Jobez, P. and Afzelius, M. and Gisin, N.},
  journal = {Phys. Rev. A},
  volume = {88},
  issue = {2},
  pages = {022324},
  numpages = {7},
  year = {2013},
  month = {Aug},
  doi = {10.1103/PhysRevA.88.022324},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.88.022324},
  publisher = {American Physical Society},
  abstract = {A long-lived quantum memory is a firm requirement for implementing a quantum repeater scheme. Recent
progress in solid-state rare-earth-ion-doped systems justifies their status as very strong candidates for such
systems. Nonetheless an optical memory based on spin-wave storage at the single-photon level has not been
shown in such a system to date, which is crucial for achieving the long storage times required for quantum
repeaters. In this paper we show that it is possible to execute a complete atomic frequency comb (AFC) scheme,
 ̄ = 2.5 ± 0.6 photons per pulse. We discuss in detail
including spin-wave storage, with weak coherent pulses of n
the experimental steps required to obtain this result and demonstrate the coherence of a stored time-bin pulse.
We show a noise level of (7.1 ± 2.3) × 10−3 photons per mode during storage, and this relatively low noise level
paves the way for future quantum optics experiments using spin waves in rare-earth-doped crystals.}
}