Coherent optical writing and reading of the exciton spin state in single quantum dots

Abstract

We demonstrate a one to one correspondence between the polarization state of a light pulse tuned to neutral exciton resonances of single semiconductor quantum dots and the spin state of the exciton that it photogenerates. This is accomplished using two variably polarized and independently tuned picosecond laser pulses. The first "writes" the spin state of the resonantly excited exciton. The second is tuned to biexcitonic resonances, and its absorption is used to "read" the exciton spin state. The absorption of the second pulse depends on its polarization relative to the exciton spin direction. Changes in the exciton spin result in corresponding changes in the intensity of the photoluminescence from the biexciton lines which we monitor, obtaining thus a one to one mapping between any point on the Poincare sphere of the light polarization to a point on the Bloch sphere of the exciton spin.

4 pages, 4 figures accepted for publication in PRL

References in corpus (5)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Coherent transfer of light polarization to electron spins in a semiconductor
• Polarization sensitive spectroscopy of charged Quantum Dots
• Two qubit conditional quantum logic operation in a single self-assembled quantum dot
• Radiative cascade from quantum dot metastable spin-blockaded biexciton

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