# All

## Accelerating Molecular Dynamics Simulations with Population Annealing

Author(s): Henrik Christiansen, Martin Weigel, and Wolfhard Janke
Population annealing is a powerful tool for large-scale Monte Carlo simulations. We adapt this method to molecular dynamics simulations and demonstrate its excellent accelerating effect by simulating the folding of a short peptide commonly used to gauge the performance of algorithms. The method is c...
[Phys. Rev. Lett. 122, 060602] Published Thu Feb 14, 2019

## Lacunarity exponents

Many physical processes result in very uneven, apparently random, distributions of matter,
characterised by fluctuations of the local density varying over orders of magnitude. The density of
matter in the sparsest regions can have a power-law distribution, with an exponent that we term the
lacunarity exponent. We discuss a mechanism which explains the wide occurrence of these power laws,
and give analytical expressions for the exponent in some simple models.

## Force-induced desorption of uniform branched polymers

We analyze the phase diagrams of self-avoiding walk models of uniform branched polymers adsorbed at
a surface and subject to an externally applied vertical pulling force which, at critical values,
desorbs the polymer. In particular, models of adsorbed branched polymers with homeomorphism types,
stars, tadpoles, dumbbells and combs are examined. These models generalize the earlier results on
linear, ring and 3-star polymers. In the case of star polymers, we confirm a phase diagram with four

## Two-dimensional superintegrable systems from operator algebras in one dimension

We develop new constructions of 2D classical and quantum superintegrable Hamiltonians allowing
separation of variables in Cartesian coordinates. In classical mechanics we start from two functions
on a one-dimensional phase space, a natural Hamiltonian H and a polynomial of order N in the
momentum p  . We assume that their Poisson commutator ##IMG##
[http://ej.iop.org/images/1751-8121/52/11/115202/aab01a2ieqn001.gif] vanishes, is a constant, a

## Trace optimality of SIC POVMs

Symmetric informationally complete positive operator valued measures (SIC POVM) are families of
##IMG## [http://ej.iop.org/images/1751-8121/52/11/115203/aab0067ieqn001.gif] unit vectors in the
complex Cartesian space ##IMG## [http://ej.iop.org/images/1751-8121/52/11/115203/aab0067ieqn002.gif]

## A classification of global conformal invariants

We provide the full classification, in arbitrary even and odd dimensions, of global conformal
invariants, i.e. scalar densities in the spacetime metric and its derivatives that are invariant,
possibly up to a total derivative, under local Weyl rescalings of the metric. We use cohomological
techniques that have already proved instrumental in the classification of Weyl anomalies in
arbitrary dimensions. The approach we follow is purely algebraic and borrows techniques originating

## Asymmetric broadcasting of quantum correlations

Author(s): Aditya Jain, Indranil Chakrabarty, and Sourav Chatterjee
In this work, we exhaustively investigate $1→2$ local and nonlocal broadcasting of entanglement as well as correlations beyond entanglement (geometric discord) using asymmetric Pauli cloners with the most general two-qubit state as the resource. We exemplify asymmetric broadcasting of entanglement u...
[Phys. Rev. A 99, 022315] Published Wed Feb 13, 2019

## Local unambiguous discrimination of symmetric ternary states

Author(s): Kenji Nakahira, Kentaro Kato, and Tsuyoshi Sasaki Usuda
We investigate unambiguous discrimination between given quantum states with a sequential measurement, which is restricted to local measurements and one-way classical communication. If the given states are binary or each of their individual state spaces is two dimensional, then it is in some cases kn...
[Phys. Rev. A 99, 022316] Published Wed Feb 13, 2019

## Quantifying Memory Capacity as a Quantum Thermodynamic Resource

Author(s): Varun Narasimhachar, Jayne Thompson, Jiajun Ma, Gilad Gour, and Mile Gu
The information-carrying capacity of a memory is known to be a thermodynamic resource facilitating the conversion of heat to work. Szilard’s engine explicates this connection through a toy example involving an energy-degenerate two-state memory. We devise a formalism to quantify the thermodynamic va...
[Phys. Rev. Lett. 122, 060601] Published Wed Feb 13, 2019

## Limits on Spectral Resolution Measurements by Quantum Probes

Author(s): Amit Rotem, Tuvia Gefen, Santiago Oviedo-Casado, Javier Prior, Simon Schmitt, Yoram Burak, Liam McGuiness, Fedor Jelezko, and Alex Retzker
The limits of frequency resolution in nano-NMR experiments have been discussed extensively in recent years. It is believed that there is a crucial difference between the ability to resolve a few frequencies and the precision of estimating a single one. Whereas the efficiency of single frequency esti...
[Phys. Rev. Lett. 122, 060503] Published Wed Feb 13, 2019