Coherent optical writing and reading of the exciton spin state in single quantum dots - Quantum PhysicsReport as inadecuate




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Abstract: We demonstrate a one to one correspondence between the polarization state ofa light pulse tuned to neutral exciton resonances of single semiconductorquantum dots and the spin state of the exciton that it photogenerates. This isaccomplished using two variably polarized and independently tuned picosecondlaser pulses. The first -writes- the spin state of the resonantly excitedexciton. The second is tuned to biexcitonic resonances, and its absorption isused to -read- the exciton spin state. The absorption of the second pulsedepends on its polarization relative to the exciton spin direction. Changes inthe exciton spin result in corresponding changes in the intensity of thephotoluminescence from the biexciton lines which we monitor, obtaining thus aone to one mapping between any point on the Poincare sphere of the lightpolarization to a point on the Bloch sphere of the exciton spin.



Author: Y. Benny, S. Khatsevich, Y. Kodriano, E. Poem, R. Presman, D. Galushko, P. M. Petroff, D. Gershoni

Source: https://arxiv.org/







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