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Eur. Phys. J. B 13, 585-588

Detecting quantum signatures of optical fields by ultrasmall Josephson junctions

R. Migliore - A. Messina - A. Napoli

INFM and MURST, Dipartimento di Scienze Fisiche ed Astronomiche, via Archirafi 36, 90123 Palermo, Italy
messina@fisica.unipa.it

Received 1 June 1999 and Received in final form 30 July 1999

Abstract
We prove that a mesoscopic Josephson junction, irradiated with a quantum superposition of two $180^\circ$-out of phase optical coherent states, exhibits an experimentally observable sensitivity to the quantum coherences of the field state.

PACS
73.23.-b Mesoscopic systems - 74.50.+r Proximity effects, weak links, tunneling phenomena, and Josephson effects - 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements

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