Premium
Ramsey fringes in a single InGaAs/GaAs quantum dot
Author(s) -
Ester P.,
Stufler S.,
de Michaelis Vasconcellos S.,
Bichler M.,
Zrenner A.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200668028
Subject(s) - laser linewidth , quantum dot , physics , excitation , pulse (music) , quantum point contact , optics , optoelectronics , quantum mechanics , quantum well , voltage , laser
We report the observation of Ramsey fringes in single InGaAs/GaAs quantum dots. With double pulse p/2 excitation it is possible to control the occupancy and the phase of a quantum dot. The occupancy of the quantum dot oscillates with detuning. These Ramsey fringes are caused by a voltage dependent detuning of the QD. Due to the double pulse excitation the spectral sensitivity is strongly enhanced as compared to single pulse experiments. At long delay times we are able to resolve extremely narrow spectral fringes, clearly below the homogeneous linewidth of the underlying QD two level system. Our results demonstrate precision measurements on single quantum dots with strong implications for future quantum gates and quantum measurements. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)