The manner in which states of some quantum systems become effectively classical is of
great significance for the foundations of quantum physics, as well as for problems of …

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 …

We provide a general protocol to measure out-of-time-order correlation functions. These
correlation functions are of broad theoretical interest for diagnosing the scrambling of …

It was proposed recently that the out-of-time-ordered four-point correlator (OTOC) may serve
as a useful characteristic of quantum-chaotic behavior, because, in the semiclassical limit …

A boundary transfer matrix formulation allows to calculate the Loschmidt echo for one-
dimensional quantum systems in the thermodynamic limit. We show that nonanalyticities in …

In close analogy to the fundamental role of random numbers in classical information theory,
random operators are a basic component of quantum information theory. Unfortunately, the …

We examine two exactly solvable models of decoherence—a central spin-system,(i) with
and (ii) without a self-Hamiltonian, interacting with a collection of environment spins. In the …

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 …

In closed quantum systems, dynamical phase transitions are identified by the nonanalytic
behavior of the return probability as a function of time. In this work, we study the nonunitary …

We explore the dynamics of entanglement in classically chaotic systems by considering a
multiqubit system that behaves collectively as a spin system obeying the dynamics of the …