Results 51 to 60 of about 189,782 (285)

Convergence theorems for quantum annealing [PDF]

, 2006
We prove several theorems to give sufficient conditions for convergence of quantum annealing, which is a protocol to solve generic optimization problems by quantum dynamics.
Aarts E, Das A, Farhi E Goldstone J Gutmann S Sipser M, Garey M R, Geman S, Hidetoshi Nishimori, Kadowaki T, Landau D P, Lee Y-H, Nishimori H, Santoro G E, Sarjala M, Satoshi Morita, Stella L Santoro G E, Tanaka K   +14 more
core   +4 more sources

Reptation Quantum Monte Carlo [PDF]

, 2017
We present an elementary and self-contained account of the analogies existing between classical diffusion and the imaginary-time evolution of quantum systems. These analogies are used to develop a new quantum simulation method which allows to calculate the ground-state expectation values of local observables without any mixed estimates nor population ...
Baroni, S., Moroni, S.
openaire   +3 more sources

Universal Electronic‐Structure Relationship Governing Intrinsic Magnetic Properties in Permanent Magnets

Advanced Functional Materials, EarlyView.
Permanent magnets derive their extraordinary strength from deep, universal electronic‐structure principles that control magnetization, anisotropy, and intrinsic performance. This work uncovers those governing rules, examines modern modeling and AI‐driven discovery methods, identifies critical bottlenecks, and reveals electronic fingerprints shared ...
Prashant Singh
wiley   +1 more source

A universal black-box quantum Monte Carlo approach to quantum phase transitions

npj Computational Materials
We derive exact, universal, closed-form quantum Monte Carlo estimators for finite-temperature energy susceptibility and fidelity susceptibility, applicable to essentially arbitrary Hamiltonians.
Nic Ezzell, Lev Barash, Itay Hen
doaj   +1 more source

Quantum Monte Carlo simulations for estimating FOREX markets: a speculative attacks experience

Humanities & Social Sciences Communications, 2023
The foreign exchange markets, renowned as the largest financial markets globally, also stand out as one of the most intricate due to their substantial volatility, nonlinearity, and irregular nature. Owing to these challenging attributes, various research
David Alaminos, M. Belén Salas, Manuel Á. Fernández-Gámez   +2 more
doaj   +1 more source

The Quantum Amplitude Estimation Algorithms on Near-Term Devices: A Practical Guide

Quantum Reports, 2023
The Quantum Amplitude Estimation (QAE) algorithm is a major quantum algorithm designed to achieve a quadratic speed-up. Until fault-tolerant quantum computing is achieved, being competitive over classical Monte Carlo (MC) remains elusive.
Marco Maronese, Massimiliano Incudini, Luca Asproni, Enrico Prati   +3 more
doaj   +1 more source

Random walks near Rokhsar-Kivelson points

, 2005
There is a class of quantum Hamiltonians known as Rokhsar-Kivelson(RK)-Hamiltonians for which static ground state properties can be obtained by evaluating thermal expectation values for classical models.
Fazekas P., Hetherington J. H., Ivanov D. A., Kalos M. H., Kivelson S. A., Leung P. W., Liu K. S., Nightingale M. P., OLAV F. SYLJUÅSEN, Sachdev S., Schmidt K. E., Syljuåsen O. F., Syljuåsen O. F., Syljuåsen O. F., Zhitomirsky M. E.   +14 more
core   +1 more source

Optimization of ground and excited state wavefunctions and van der Waals clusters [PDF]

, 2000
A quantum Monte Carlo method is introduced to optimize excited state trial wavefunctions. The method is applied in a correlation function Monte Carlo calculation to compute ground and excited state energies of bosonic van der Waals clusters of upto seven
Andrei Mushinski, B. Bernu, C. J. Umrigar, C. J. Umrigar, C. J. Umrigar, D. Blume, D. Blume, D. H. Zhang, D. M. Ceperley, D. M. Leitner, G. H. Golub, J. de Boer, J. H. Hetherington, J. K. L. MacDonald, M. Caffarel, M. Caffarel, M. Foulkes, M. Meierovich, M. P. Nightingale, M. P. Nightingale, M. P. Nightingale, V. Melik-Alaverdian, Vilen Melik-Alaverdian, W. H. Press, W. R. Brown   +24 more
core   +3 more sources

Post-measurement quantum Monte Carlo

Physical Review B
We show how the effects of large numbers of measurements on many-body quantum ground and thermal states can be studied using Quantum Monte Carlo (QMC). Density matrices generated by measurement in this setting feature products of many local nonunitary operators, and by expanding these density matrices as sums over operator strings we arrive at a ...
Kriti Baweja, David J. Luitz, Samuel J. Garratt   +2 more
openaire   +2 more sources

Electric Field‐Dependent Conductivity as Probe for Charge Carrier Delocalization and Morphology in Organic Semiconductors

Advanced Functional Materials, EarlyView.
Applying a high electric field to a doped organic semiconductor heats up the charge carrier distribution beyond the lattice temperature, enhancing conductivity. It is shown that the associated effective temperature can be used to extract the effective localization length, which is a characteristic length scale of charge transport and provides ...
Morteza Shokrani, Felix Maximilian Graf, Anton Kompatscher, Dennis Derewjanko, Martijn Kemerink   +4 more
wiley   +1 more source