Optimisation And Applications Of A Raman Quantum Memory For Temporal Modes Of Light
November 16th, 2018 JOSEPH MUNNS Imperial College London

Practical, scalable, architectures for quantum information processing and quantum communication at some point rely upon interfacing different systems drawing upon the strengths of various media: for instance where one exploits the precision and controllability of quantum states and interactions in material systems, combined with photonic systems which exhibit only weak interaction with their environment (and other photons). The former facilitate information processing, whereas the latter are ideal for the transmission of information between nodes of a quantum network.

To realise this vision of quantum networks, one requires the means to overcome the “scaling problem” intrinsic to many photonic-based quantum technologies due to probabilistic operations, or loss. It has been identified that optical quantum memories, facilitating the storage and retrieval of quantum states of light, are an enabling technology. Furthermore at the nodes of such a network, interfacing optical states with material systems have requirements on the spectral & temporal properties of the light. Therefore, in order to build up a larger scale network, an additional requirement is the ability to coherently transform the photon in time and frequency in order to interface different systems.

A Raman quantum memory offers the functionality to address both of these desiderata. I will present a summary of our progress in optimisation of the Raman memory interaction in thermal caesium vapour, and discuss proof of principle investigations into the application of this platform as a device for the manipulation of temporal modes of light.

Seminar, November 16, 2018, 12:00. ICFO’s Blue Lecture Room

Hosted by Prof. Hugues de Riedmatten