Generation of squeezed phonon states by optical excitation of a quantum dot

Titelangaben

Reiter, Doris ; Sauer, S. ; Huneke, Jan ; Papenkort, Thomas ; Kuhn, Tilmann ; Vagov, Alexei ; Axt, Vollrath Martin:
Generation of squeezed phonon states by optical excitation of a quantum dot.
In: Journal of Physics: Conference Series. Bd. 193 (2009) Heft 1 . - 012121.
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/193/1/012121

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Abstract

A theoretical analysis of the fluctuation properties of optical phonons generated by the optical excitation of a quantum dot is presented. In particular we study whether squeezed states may be generated where either the fluctuations of the displacement or of the momentum fall below the vacuum level. The calculations are based on a generating functions formalism which provides analytical results for the case of excitation by ultrashort optical pulses. While after a single pulse excitation no squeezing occurs we find that after an excitation with two phase-locked pulses phonon states can be created where the uncertainties of displacement or momentum temporarily fall below their vacuum values.