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Atomic quantum dots

Jonathan P. Dowling, Julio R. Gea-Banacloche

Published May 8, 1994• 2 citations
OpenAlex

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The cavity quantum electrodynamics framework, in which an atom in a cavity is coupled to the cavity's optical modes, is being explored as a potential building block for quantum information-processing architectures. However, atom mobility within the cavity can hinder control of the process. The use of artificial atoms, or quantum dots, confined to a high-quality optical cavity is one possible solid-state solution to the dynamics issue. Despite being designed to be identical, though, the dots can differ slightly from one another in size and atomic composition, thereby giving rise to distinct excitation spectra for each dot. This spectral variability is expected to cause a problem for communication between dots in an ensemble. By heating individual quantum dots through the laser excitation of a nearby connected heat pad, Faraon et al. show that the spectra of individual dots can be tweaked by up to 1.8 nm, thus providing the possibility of tuning the excitation spectra of an ensemble of quantum dots. — ISO

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We consider the dephasing of two internal states |0> and |1> of a trapped impurity atom, a so-called atomic quantum dot (AQD), where only state |1> couples to a Bose-Einstein condensate (BEC). A direct relation between the dephasing of the internal states of the AQD and the temporal phase fluctuations of the BEC is established. Based on this relation we suggest a scheme to probe BEC phase fluctuations nondestructively via dephasing measurements of the AQD. In particular, the scheme allows to trace the dependence of the phase fluctuations on the trapping geometry of the BEC.
We consider the dephasing of two internal states |0⟩ and |1⟩ of a trapped impurity atom, a so-called atomic quantum dot (AQD), where only state |1⟩ couples to a Bose–Einstein condensate (BEC). A direct relation between the dephasing of the internal states of the AQD and the temporal phase fluctuations of the BEC is established. Based on this relation we suggest a scheme to probe BEC phase fluctuations non-destructively via dephasing measurements of the AQD. In particular, the scheme allows to trace the dependence of the phase fluctuations on the trapping geometry of the BEC.