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Conference on Lasers and Electro-Optics

Coherent Writing and Reading of Quantum Dot Exciton State by Resonant Two Colors Polarized Laser Pulses

S. Khatsevich, Yaron Kodriano, Chene Tradonsky, Yael Benny, Dmitry Galushko, Pierre M. Petroff, D. Gershoni

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We use a resonant circularly polarized picosecond laser pulse to write a coherent superposition of exciton's states. We use a second, delayed circularly polarized pulse, tuned into the biexciton resonance to read the exciton's state.
DOI
10.1364/qels.2010.qfd7

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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.
We demonstrate control over the spin state of a semiconductor quantum dot exciton using a polarized picosecond laser pulse slightly detuned from a biexciton resonance. The control pulse follows an earlier pulse, which generates an exciton and initializes its spin state as a coherent superposition of its two nondegenerate eigenstates. The control pulse preferentially couples one component of the exciton state to the biexciton state, thereby rotating the exciton's spin direction. We detect the rotation by measuring the polarization of the exciton spectral line as a function of the time difference between the two pulses. We show experimentally and theoretically how the angle of rotation depends on the detuning of the second pulse from the biexciton resonance.