Narrowband Single Photons for Quantum Memories, to Thin Films and Nanosystems

Quantum memories are likely to be essential components to long-distance quantum communication, storing quantum states to aid the distribution of entanglement across a network. For efficient storage and recall of single photons, it is vital to have spectrally-matched properties between flying qubit and the stationary memory. Atomic ensembles are one such option, particularly with the use of the Gradient Echo Memory protocol. The tailoring of single photons to sub-linewidth bandwidths was achieved with a cavity-enhanced spontaneous parametric downconversion source, which will be highlighted in this talk (along with a unique output state capable of Hong-Ou-Mandel dip revivals with photons just over 100m apart) as well as the first single photon storage from GEM in a hot rubidium vapour. Sarah will also expand on current activities within CSIRO – Australia’s National Science agency – with capabilities in the fabrication and characterisation of thin films, nanosystems, superconducting devices and THz technology.