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Single Cooper pair tunneling induced by non-classical microwaves

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arxiv cond-mat/9601011 v1 pith:EB2DUCTR submitted 1996-01-04 cond-mat

Single Cooper pair tunneling induced by non-classical microwaves

classification cond-mat
keywords microwavesstepsblochcooperfieldnon-classicaltunnelingaffects
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

A mesoscopic Josephson junction interacting with a mode of non-classical microwaves with frequency $\omega$ is considered. Squeezing of the electromagnetic field drastically affects the dynamics of Cooper tunneling. In particular, Bloch steps can be observed even when the microwaves are in the squeezed vacuum state with {\em zero} average amplitude of the field $\langle E(t) \rangle = 0$. The interval between these steps is double in size in comparison to the conventional Bloch steps.

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