Ultrafast all-optical coherent control of silicon vacancy colour centres in diamond

Abstract

Full coherent control of quantum systems is a key prerequisite to build a quantum information processing (QIP) system. Spatially selective and ultrafast control of individual qubits in multi-qubit systems, on the other hand, optimally is based on all-optical control techniques using short laser pulses. However, these techniques require optically accessible quantum systems with suitable electronic level configurations to allow for the application of ultrafast and thus broadband pulses. Moreover, to enable good scalability, quantum systems in the solid state are generally preferred. So far, the only quantum systems in the solid state that match all these requirements are semiconductor quantum dots. However, to achieve a suitable level structure in these systems charged dots in strong magnetic fields have to be used.