Browsing University of Waterloo by Author "Roy, Pierre-Nicholas"
Now showing items 1-7 of 7
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Comparison of the multi-layer multi-configuration time-dependent Hartree (ML-MCTDH) method and the density matrix renormalization group (DMRG) for ground state properties of linear rotor chains
Mainali, Samrit; Gatti, Fabien; Iouchtchenko, Dmitri; Roy, Pierre-Nicholas; Meyer, Hans-Dieter (AIP, 2021-05-05)We demonstrate the applicability of the Multi-Layer Multi-Configuration Time-Dependent Hartree (ML-MCTDH) method to the problem of computing ground states of one-dimensional chains of linear rotors with dipolar interactions. ... -
Entangling qubit registers via many-body states of ultracold atoms
Melko, Roger; Herdman, Chris; Iouchtchenko, Dmitri; Roy, Pierre-Nicholas; Del Maestro, Adrian (American Physical Society, 2016-04-25)Inspired by the experimental measurement of the Rényi entanglement entropy in a lattice of ultracold atoms by Islam et al. [Nature (London) 528, 77 (2015)], we propose a method to entangle two spatially separated qubits ... -
Ground states of linear rotor chains via the density matrix renormalization group
Iouchtchenko, Dmitri; Roy, Pierre-Nicholas (American Institute of Physics, 2018-04-04)In recent years, experimental techniques have enabled the creation of ultracold optical lattices of molecules and endofullerene peapod nanomolecular assemblies. It was previously suggested that the rotor model resulting ... -
A path integral ground state replica trick approach for the computation of entanglement entropy of dipolar linear rotors
Sahoo, Tapas; Iouchtchenko, Dmitri; Herdman, C. M.; Roy, Pierre-Nicholas (AIP Publishing, 2020-05-14)We calculate the second Rényi entanglement entropy for systems of interacting linear rotors in their ground state as a measure of entanglement for continuous rotational degrees of freedom. The entropy is defined in relation ... -
A path integral methodology for obtaining thermodynamic properties of nonadiabatic systems using Gaussian mixture distributions
Raymond, Neil; Iouchtchenko, Dmitri; Roy, Pierre-Nicholas; Nooijen, Marcel (American Institute of Physics, 2018-05)We introduce a new path integral Monte Carlo method for investigating nonadiabatic systems in thermal equilibrium and demonstrate an approach to reducing stochastic error. We derive a general path integral expression for ... -
Quantifying entanglement of rotor chains using basis truncation: Application to dipolar endofullerene peapods
Halverson, Tom; Iouchtchenko, Dmitri; Roy, Pierre-Nicholas (American Institute of Physics, 2018-02-21)We propose a variational approach for the calculation of the quantum entanglement entropy of assemblies of rotating dipolar molecules. A basis truncation scheme based on the total angular momentum quantum number is proposed. ... -
Reconstructing quantum molecular rotor ground states
De Vlugt, Isaac J. S.; Iouchtchenko, Dmitri; Merali, Ejaaz; Roy, Pierre-Nicholas; Melko, Roger (Physical Review B, 2020-07-06)Nanomolecular assemblies of C60 can be synthesized to enclose dipolar molecules. The low-temperature states of such endofullerenes are described by quantum mechanical rotors, which are candidates for quantum information ...