We are an experimental quantum optics group run by Kevin Resch, based in the Department of Physics & Astronomy and the Institute for Quantum Computing at the University of Waterloo.

New Nature Communications on photon waveform conversion in diamond

Our new article Frequency and bandwidth conversion of single photons in a room-temperature diamond quantum memory by K.A.G. Fisher, D.G. England, J.-P.W. MacLean, P.J. Bustard, K.J. Resch, and B.J. Sussman was published in Nature Communications.  The work is the result of our collaboration with Ben Sussman’s Quantum Technology group at the National Research Council of Canada.

Abstract: The spectral manipulation of photons is essential for linking components in a quantum network. Large frequency shifts are needed for conversion between optical and telecommunication frequencies, while smaller shifts are useful for frequency-multiplexing quantum systems, in the same way that wavelength division multiplexing is used in classical communications. Here we demonstrate frequency and bandwidth conversion of single photons in a room-temperature diamond quantum memory. Heralded 723.5nm photons, with 4.1nm bandwidth, are stored as optical phonons in the diamond via a Raman transition. Upon retrieval from the diamond memory, the spectral shape of the photons is determined by a tunable read pulse through the reverse Raman transition. We report central frequency tunability over 4.2 times the input bandwidth, and bandwidth modulation between 0.5 and 1.9 times the input bandwidth. Our results demonstrate the potential for diamond, and Raman memories in general, as an integrated platform for photon storage and spectral conversion.

See also a write-up on our work:
Changing the colour of single photons in a diamond quantum memory,

Thank you Minister Duncan!

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