3,781 research outputs found
Sample Paths of the Solution to the Fractional-colored Stochastic Heat Equation
Let u = {u(t, x), t [0, T ], x R d } be the solution to the
linear stochastic heat equation driven by a fractional noise in time with
correlated spatial structure. We study various path properties of the process u
with respect to the time and space variable, respectively. In particular, we
derive their exact uniform and local moduli of continuity and Chung-type laws
of the iterated logarithm
Continuous-variable teleportation: a new look
In contrast to discrete-variable teleportation, a quantum state is
imperfectly transferred from a sender to a remote receiver in a
continuous-variable setting. We recall the ingenious scheme proposed by
Braunstein and Kimble for teleporting a one-mode state of the quantum radiation
field. By analyzing this protocol, we have previously proven the factorization
of the characteristic function of the output state. This indicates that
teleportation is a noisy process that alters, to some extent, the input state.
Teleportation with a two-mode Gaussian EPR state can be described in terms of
the superposition of a distorting field with the input one. Here we analyze the
one-mode Gaussian distorting-field state. Some of its most important properties
are determined by the statistics of a positive EPR operator in the two-mode
Gaussian resource state. We finally examine the fidelity of teleportation of a
coherent state when using an arbitrary resource state.Comment: Contribution to the special issue of Romanian Journal of Physics
dedicated to the centenary of Serban Titeica (1908-1985), the founder of the
school of theoretical physics in Romani
On the law of the solution to a stochastic heat equation with fractional noise in time
We study the law of the solution to the stochastic heat equation with
additive Gaussian noise which behaves as the fractional Brownian motion in time
and is white in space. We prove a decomposition of the solution in terms of the
bifractional Brownian motion
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