Igor V. Yurkevich

Information capacity of optical fiber channels with zero average dispersion

We study the statistics of optical data transmission in a noisy nonlinear fiber channel with a weak dispersion management and zero average dispersion. Applying analytical expressions for the output probability density functions both for a nonlinear channel and for a linear channel with additive and multiplicative noise we calculate in a closed form a lower bound estimate on the Shannon capacity for an arbitrary signal-to-noise ratio.

NONPERTURBATIVE RESULTS FOR LEVEL CORRELATIONS FROM THE REPLICA NONLINEAR SIGMA MODEL

We show that for all three standard symmetry classes (unitary, orthogonal, and symplectic), the conventional replica nonlinear

Low-temperature decoherence of qubit coupled to background charges

\ensuremath{\sigma}

Quantum wire hybridized with a single-level impurity

model gives the correct nonperturbative result for the two-level correlation functions

Determination of excitation profile and dielectric function spatial nonuniformity in porous silicon by using WKB approach

{R}_{2}(\ensuremath{\omega})

Enhanced carrier-carrier interaction in optically pumped hydrogenated nanocrystalline silicon

of electrons in disordered metals in the limit of large

Functional Integral Bosonization for Impurity in Luttinger Liquid

\ensuremath{\omega}.

Decoherence of charge qubit coupled to interacting background charges

In this limit, nonperturbative oscillatory contributions arise from a degenerate saddle-point manifold within this

Bosonisation as The Hubbard-Stratonovich transformation

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Duality of Weak and Strong Scatterer in a Luttinger Liquid Coupled to Massless Bosons

model that correspond to the replica-symmetry breaking. Moreover, we demonstrate that in the unitary case the very same results can be extracted from the exact integral representation for