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Large deviations for dynamical fluctuations of open Markov processes, with application to random cascades on trees

The large deviations at ‘Level 2.5 in time’ for time-dependent ensemble-empirical-observables,
introduced by Maes et al (2008 Markov Proc. Relat. Fields 14 445) for the case of ##IMG##
[http://ej.iop.org/images/1751-8121/52/2/025001/aaaf141ieqn001.gif] independent Markov jump
processes, are extended to the case of open Markov processes with reservoirs: explicit formulas are

Large- N properties of a non-ideal Bose gas

We rigorously discuss the large- ##IMG##
[http://ej.iop.org/images/1751-8121/52/2/025002/aaaede7ieqn003.gif] thermodynamics of a Bose gas
with a short-range two-body potential. Considering the system as a mixture of ##IMG##
[http://ej.iop.org/images/1751-8121/52/2/025002/aaaede7ieqn004.gif] identical components with a

GBDT and algebro-geometric approaches to explicit solutions and wave functions for nonlocal NLS

We apply the GBDT version of the Bäcklund–Darboux transformation to the nonlocal NLS (focusing and
defocusing cases). The matrix case is included and solutions in the form of rectangular ##IMG##
[http://ej.iop.org/images/1751-8121/52/2/025201/aaaedebieqn001.gif] matrix functions are dealt with.
In the case of the trivial initial solution, wide classes of the wave functions and multipole

The finite ##IMG## [http://ej.iop.org/images/1751-8121/52/2/025302/toc_aaaefb0ieqn001.gif] {${\mathcal{PT}}$} -symmetric square well potential

The ##IMG## [http://ej.iop.org/images/1751-8121/52/2/025302/aaaefb0ieqn003.gif] -symmetric version
of the one-dimensional finite square well potential is constructed by supplementing the real finite
square well potential with constant imaginary components outside the well. This study is motivated
by the unusual features of the ##IMG##

Wehrl-entropy-based quantification of nonclassicality for single-mode quantum optical states

Nonclassical states of a quantized light are described in terms of Glauber–Sudarshan ##IMG##
[http://ej.iop.org/images/1751-8121/52/2/025303/aaaeebfieqn001.gif] distribution, which is not a
genuine classical probability distribution. Despite several attempts, defining a uniform measure of
nonclassicality (NC) for the single-mode quantum states of light remains an open task. In our

Conformal Data and Renormalization Group Flow in Critical Quantum Spin Chains Using Periodic Uniform Matrix Product States

Author(s): Yijian Zou, Ashley Milsted, and Guifre Vidal
We establish that a Bloch-state ansatz based on periodic uniform matrix product states (PUMPS), originally designed to capture single-quasiparticle excitations in gapped systems, is in fact capable of accurately approximating all low-energy eigenstates of critical quantum spin chains on the circle. ...
[Phys. Rev. Lett. 121, 230402] Published Fri Dec 07, 2018

Direct Reconstruction of the Quantum Density Matrix by Strong Measurements

Author(s): Luca Calderaro, Giulio Foletto, Daniele Dequal, Paolo Villoresi, and Giuseppe Vallone
New techniques based on weak measurements have recently been introduced to the field of quantum state reconstruction. Some of them allow the direct measurement of each matrix element of an unknown density operator and need only $O(d)$ different operations, compared to ${d}^{2}$ linearly independent ...
[Phys. Rev. Lett. 121, 230501] Published Fri Dec 07, 2018

Steering random spin systems to speed up the quantum adiabatic algorithm

Author(s): A. Barış Özgüler, Robert Joynt, and Maxim G. Vavilov
A general time-dependent quantum system can be driven fast from its initial ground state to its final ground state without generating transitions by adding a steering term to the Hamiltonian. We show how this technique can be modified to improve on the standard quantum adiabatic algorithm by making ...
[Phys. Rev. A 98, 062311] Published Fri Dec 07, 2018

Superdiffusion in One-Dimensional Quantum Lattice Models

Author(s): Enej Ilievski, Jacopo De Nardis, Marko Medenjak, and Tomaž Prosen
We identify a class of one-dimensional spin and fermionic lattice models that display diverging spin and charge diffusion constants, including several paradigmatic models of exactly solvable, strongly correlated many-body dynamics such as the isotropic Heisenberg spin chains, the Fermi-Hubbard model...
[Phys. Rev. Lett. 121, 230602] Published Fri Dec 07, 2018

Locally optimal control of continuous-variable entanglement

Author(s): Francesco Albarelli, Uther Shackerley-Bennett, and Alessio Serafini
We consider a system of two bosonic modes each subject to the dynamics induced by a thermal Markovian environment and we identify instantaneous, local symplectic controls that minimize the loss of entanglement in the Gaussian regime. By minimizing the decrease of the logarithmic negativity at every ...
[Phys. Rev. A 98, 062312] Published Fri Dec 07, 2018