Detecting quantum signatures of optical fields by ultrasmall Josephson junctions
INFM and MURST, Dipartimento di Scienze Fisiche ed Astronomiche, via Archirafi 36, 90123 Palermo, Italy
Revised: 30 July 1999
Published online: 15 February 2000
We prove that a mesoscopic Josephson junction, irradiated with a quantum superposition of two 180°-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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000