Storage and retrieval of ultrafast single photons using a   room-temperature diamond quantum memory
  We report the storage and retrieval of single photons, via a quantum memory, in the optical phonons of room-temperature bulk diamond. The THz-bandwidth heralded photons are generated by spontaneous parametric downconversion and mapped to phonons via a Raman transition, stored for a variable delay, and released on demand. The second-order correlation of the memory output is $g^{(2)}(0) = 0.65 \pm 0.07$, demonstrating preservation of non-classical photon statistics throughout storage and retrieval. The memory is low-noise, high-speed and broadly tunable; it therefore promises to be a versatile light-matter interface for local quantum processing applications. 
Duncan G. England, Kent A.G. Fisher, Jean-Philippe W. MacLean, Philip   J. Bustard, Rune Lausten, Kevin J. Resch, and Benjam...
quant-ph