Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule

Details Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule

2008-09-09

arxiv.org/abs/0809.1673v3

Physics

Quantum Physics

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.236804

The spin of an electron in a self-assembled InAs/GaAs quantum dot molecule is optically prepared and measured through the trion triplet states. A longitudinal magnetic field is used to tune two of the trion states into resonance, forming a superposition state through asymmetric spin exchange. As a result, spin-flip Raman transitions can be used for optical spin initialization, while separate trion states enable cycling transitions for non-destructive measurement. With two-laser transmission spectroscopy we demonstrate both operations simultaneously, something not previously accomplished in a single quantum dot.

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