Quantum monte carlo methods for constrained systems

S Wolf, E Curotto, M Mella - International Journal of Quantum …, 2014‏ - Wiley Online Library
The torsional ground state for ethane, the torsional, rotational, and mixed torsional and
rotational ground state of propane are computed with a version of diffusion Monte Carlo …

Quantum Monte Carlo simulations of selected ammonia clusters (n= 2–5): Isotope effects on the ground state of typical hydrogen bonded systems

E Curotto, M Mella - The Journal of chemical physics, 2010‏ - pubs.aip.org
Variational Monte Carlo, diffusion Monte Carlo, and stereographic projection path integral
simulations are performed on eight selected species from the (NH 3) n,(ND 3) n,(NH 2 D) n …

Quantum correlations of identical particles subject to classical environmental noise

A Beggi, F Buscemi, P Bordone - Quantum Information Processing, 2016‏ - Springer
In this work, we propose a measure for the quantum discord of indistinguishable particles,
based on the definition of entanglement of particles given in Wiseman and Vaccaro (Phys …

Electrolyte clusters as hydrogen sponges: diffusion Monte Carlo simulations

AR Zane, E Curotto - Physical Chemistry Chemical Physics, 2022‏ - pubs.rsc.org
We carry out Diffusion Monte Carlo simulations of up to five hydrogen molecules aggregated
with two Stockmayer clusters that solvate a single lithium ion. The first one contains six point …

On the convergence of diffusion Monte Carlo in non-Euclidean spaces. I. Free diffusion

E Curotto, M Mella - The Journal of Chemical Physics, 2015‏ - pubs.aip.org
We develop a set of diffusion Monte Carlo algorithms for general compactly supported
Riemannian manifolds that converge weakly to second order with respect to the time step …

Higher order diffusion Monte Carlo propagators for linear rotors as diffusion on a sphere: Development and application to O2@ Hen

M Mella - The Journal of chemical physics, 2011‏ - pubs.aip.org
Exploiting the theoretical treatment of particles diffusing on corrugated surfaces and the
isomorphism between the “particle on a sphere” and a linear molecule rotation, a new …

On the convergence of diffusion Monte Carlo in non-Euclidean spaces. II. Diffusion with sources and sinks

E Curotto, M Mella - The Journal of Chemical Physics, 2015‏ - pubs.aip.org
We test the second order Milstein method adapted to simulate diffusion in general compact
Riemann manifolds on a number of systems characterized by nonconfining potential energy …

A rare event sampling method for diffusion Monte Carlo using smart darting

K Roberts, R Sebsebie, E Curotto - The Journal of Chemical Physics, 2012‏ - pubs.aip.org
We identify a set of multidimensional potential energy surfaces sufficiently complex to cause
both the classical parallel tempering and the guided or unguided diffusion Monte Carlo …

Ring polymer dynamics for rigid tops with an improved integrator

S Wolf, E Curotto - The Journal of chemical physics, 2014‏ - pubs.aip.org
When working in curved spaces, such as those created with the introduction of holonomic
constraints, or those generated from the parameters of Lie groups, the presence of a non …

Ring polymer dynamics in curved spaces

S Wolf, E Curotto - The Journal of Chemical Physics, 2012‏ - pubs.aip.org
T 1⁠, mapped by a stereographic projection using three potentials. Two of these are
quadratic, and one is a nonconfining sinusoidal model. We propose a new class of …