Fidelity serves as a benchmark for the reliability in quantum information processes, and has
recently attracted much interest as a measure of the susceptibility of dynamics to …

arXiv:1206.6348v1 [nlin.CD] 27 Jun 2012 Page 1 arXiv:1206.6348v1 [nlin.CD] 27 Jun 2012
Loschmidt Echo Arseni Goussev1, Rodolfo A. Jalabert2, Horacio M. Pastawski3, and Diego …

We study spin squeezing, an intrinsic quantum property, in the Dicke model without the
rotating-wave approximation. We show that the spin squeezing can reveal the underlying …

A general semiclassical expression for quantum fidelity (Loschmidt echo) of arbitrary pure
and mixed states is derived. It expresses fidelity as an interference sum of dephasing …

Pseudorandom circuits generate quantum states and unitary operators which are
approximately distributed according to the unitarily invariant Haar measure. We explore how …

We study the entanglement generation of operators whose statistical properties approach
those of random matrices but are restricted in some way. These include interpolating …

We deal with a system comprising a nonlinear (Kerr-like) oscillator excited by a series of
ultra-short external pulses. We introduce the fidelity-based entropic parameter that can be …

Resonance states of a two-electron quantum dots are studied using a variational expansion
with both real basis-set functions and complex scaling methods. The two-electron …

Quantum dynamics of many-body systems is a fascinating and significant subject for both
theory and experiment. The question of how an isolated many-body system evolves to its …

The unitarity of quantum evolutions implies that an overlap between two initial states does
not change in time. This property is commonly believed to explain the apparent lack of state …