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Coherent Writing of the Dark Exciton State Using One Picosecond Long Optical Pulse

Ido Schwartz, Dan Cogan, Emma Schmidgall, Liron Gantz, Yaroslav Don, D. Gershoni

Published Jan 1, 2015• 0 citations
Publisher

Abstract

We demonstrate a one to one correspondence between the polarization of a picosecond optical pulse and the coherent spin state of the long lived dark exciton that it deterministically photogenerates in a single quantum dot.
DOI
10.1364/cleo_qels.2015.ff1b.4

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We use one single, few-picosecond-long, variably polarized laser pulse to deterministically write any selected spin state of a quantum dot confined dark exciton whose life and coherence time are six and five orders of magnitude longer than the laser pulse duration, respectively. The pulse is tuned to an absorption resonance of an excited dark exciton state, which acquires nonnegligible oscillator strength due to residual mixing with bright exciton states. We obtain a high-fidelity one-to-one mapping from any point on the Poincar\'e sphere of the pulse polarization to a corresponding point on the Bloch sphere of the spin of the deterministically photogenerated dark exciton.
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