July 15 2013

17.07.2013 Visit of Pavel Bushev and Sebastian Probst.

Pavel Bushev and Sebastian Probst visit us and will give a talk in the Ctrl-Q Seminar with the title "Towards a quantum interface between optical an microwave photons".

Future quantum networks will interconnect many quantum systems of diverse physical nature. Photons are ideal carriers of quantum information over long distances because they can be efficiently send through low loss optical fibers. On the other hand, fast and scalable quantum gates can be implemented in solid-state system, e.g. architectures involving superconducting circuits. Thus, interfacing photonic and solid-state qubits within a hybrid quantum architecture offers a promising route towards large scale distributed quantum computing.
Ensembles of optically active spins are promising candidates for realizing such a quantum media converter. Among these, spin ensembles consisting of rare earth (RE) erbium (Er3+) ions doped into a Y2SiO5 crystal matrix play a special role due to the 1.54 μm optical transition of Er3+, which exactly matches the low loss Telecom C-band of optical fiber communication.
We are working on realizing such a coherent quantum convertor. I will present our recent results on strong coherent coupling of superconducting resonators to erbium spins in Y2SiO5 and optical spectroscopy of theses crystals at millikelvin temperatures.

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