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Storage and retrieval of THz-bandwidth single photons using a room-temperature diamond quantum memory.

Research paper by Duncan G DG England, Kent A G KA Fisher, Jean-Philippe W JP MacLean, Philip J PJ Bustard, Rune R Lausten, Kevin J KJ Resch, Benjamin J BJ Sussman

Indexed on: 24 Feb '15Published on: 24 Feb '15Published in: Physical review letters



Abstract

We report the storage and retrieval of single photons, via a quantum memory, in the optical phonons of a room-temperature bulk diamond. The THz-bandwidth heralded photons are generated by spontaneous parametric down-conversion 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±0.07, demonstrating a preservation of nonclassical 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.