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A02: Four-wave-mixing spectroscopy and optical pulse propagation in wide-gap semiconductors

M.Sc. Stefan Grisard
Photon-echo sequence. Two pulses with areas π /2 and π impinge on the sample separated by an adjustable delay τ. The second pulse induces a rephasing of the excited ensemble, which results in the photon-echo after time 2τ.

Stefan Grisard, AG Akimov

What is the challenge of my research project? Why am I eager to do it?

Our research group investigates the phenomenon of photon-echoes from semiconductor nanostructures using four-wave-mixing spectroscopy. In a typical photon-echo experiment, we excite an inhomogenously broadened ensemble of emitters, such as excitons, by a laser pulse. A time-shifted second pulse inverts the subsequent dephasing of the ensemble resulting in the photon-echo - a coherent emission of light. Studies of photon-echoes allow to acquire information  about the coherent dynamics of individual emitters in large ensembles. Moreover, the photon-echo protocol fulfills the requirements for quantum memory applications. Quantum memories store qubits and release them on demand, which is essential for synchronizing quantum operations in a computer. 

Therefore, I believe that our investigations are placed within a thrilling and promising field of research.