Quantum localized modes in capacitively coupled Josephson junctions

Details Quantum localized modes in capacitively coupled Josephson junctions Quantum localized modes in capacitively coupled Josephson junctions

2007-02-06

arxiv.org/abs/cond-mat/0702137v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures. Improved version, title was slightly changed. Accepted in Europhysics Letters (http://www.iop.org/EJ/journ

Scientific paper

10.1209/0295-5075/79/66002

We consider the quantum dynamics of excitations in a system of two capacitively coupled Josephson junctions. Quantum breather states are found in the middle of the energy spectrum of the confined nonescaping states of the system. They are characterized by a strong excitation of one junction. These states perform slow tunneling motion from one junction to the other, while keeping their coherent nature. The tunneling time sensitively depends on the initial excitation energy. By using an external bias as a control parameter, the tunneling time can be varied with respect to the escape time and the experimentally limited coherence time. Thus one can control the flow of quantum excitations between the two junctions.

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