441 research outputs found
Adsorption-induced surface normal relaxation of a solid adsorbent
We investigate adsorption of a gas on the flat surface of a solid deformable
adsorbent taking into account thermal fluctuations and analyze in detail the
effect of thermal fluctuations on the adsorbent deformation in adsorption. The
condition for coexistence of two states of a bistable system of adsorbed
particles is derived. We establish the specific properties of the
adsorption-induced surface normal relaxation of an adsorbent caused by thermal
fluctuations. The mean transition times between two stable states of the
bistable system are derived in the parabolic approximation and in the general
case.Comment: 16 pages, 5 figure
Complete elimination of information leakage in continuous-variable quantum communication channels
In all lossy communication channels realized to date, information is
inevitably leaked to a potential eavesdropper. Here we present a communication
protocol that does not allow for any information leakage to a potential
eavesdropper in a purely lossy channel. By encoding information into a
restricted Gaussian alphabet of squeezed states we show, both theoretically and
experimentally, that the Holevo information between the eavesdropper and the
intended recipient can be exactly zero in a purely lossy channel while
minimized in a noisy channel. This result is of fundamental interest, but might
also have practical implications in extending the distance of secure quantum
key distribution.Comment: 9 pages, 5 figure
Secure quantum channels with correlated twin laser beams
This work is the development and analysis of the recently proposed quantum
cryptographic protocol, based on the use of the two-mode coherently correlated
states. The protocol is supplied with the cryptographic control procedures. The
quantum noise influence on the channel error properties is examined. State
detection features are proposed
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