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Quantum computation in silicon

Project ID: 152

Supervisor(s): Sven Rogge

Sven Rogge's group works on quantum computation in silicon and the investigation of artificial quantum matter that exhibit highly correlated behaviour. The control over the electron wavefunction of a dopant atom, the building block of our quantum systems, requires a device environment which leads to the loss of bulk properties due to physical processes like the valley-orbit coupling, exchange, and many-body effects in coherent coupling. The atomistic understanding of the interaction between the environment and the atom is essential for quantum computation since it allows the achievement of optimal coherence times and optimal robustness of the quantum gates. The research spans from artificial quantum matter to universal quantum computation. Optical addressing of electrons in Si is nontrivial but vastly beneficial due to the gained flexibility and unprecedented high resolution. We investigate efficient read-out and coupling schemes to open up new pathways into optical control. Experimental techniques include low-temperature electron-spin resonance, superconducting microwave cavities, low-temperature ultra-high vacuum scanning tunnelling spectroscopy, single ion optical spectroscopy, and fabrication and use of compact optics and single photon detectors.