Ultrafast initialization and QND-readout of a spin qubit via control of nanodot-vacuum coupling

Abstract

Ultrafast initialization enables fault-tolerant processing of quantum information while QND readout enables scalable quantum computation. By spatially assembling photon resonators and wave-guides around an n-doped nanodot and by temporally designing optical pump pulses, an efficient quantum pathway can be established from an electron spin to a charged exciton to a cavity photon and finally to a flying photon in the waveguide. Such control of vacuum-nanodot coupling can be exploited for ultrafast initialization and QND readout of the spin, which are particularly compatible with the optically driven spin quantum computers.

4 pages 3 figures

References in corpus (2)

• Single-shot read-out of an individual electron spin in a quantum dot
• Measurement efficiency and n-shot read out of spin qubits

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• All-optical non-demolition measurement of single-hole spin in a quantum-dot molecule