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In this section you will find our most recent preprints published on the Arxiv. Have fun scrolling around!
Feb 21, 2017 | quant-ph
Designing Adiabatic Quantum Optimization: A Case Study for the Traveling Salesman Problem
Bettina Heim, Ethan W. Brown, Dave Wecker, Matthias Troyer. With progress in quantum technology more sophisticated quantum annealing devices are becoming available. While they offer new possibilities for solving optimization problems, their true pote ...
Read moreFeb 18, 2017 | quant-ph
Scaling analysis and instantons for thermally-assisted tunneling and Quantum Monte Carlo simulations
Zhang Jiang, Vadim N. Smelyanskiy, Sergei V. Isakov, Sergio Boixo, Guglielmo Mazzola, Matthias Troyer, Hartmut Neven. We develop an instantonic calculus to derive an analytical expression for the thermally-assisted tunneling decay rate of a metastabl ...
Read moreJan 30, 2017 | quant-ph, cond-mat.stat-mech
Quantum Monte Carlo Annealing with Multi-Spin Dynamics
Guglielmo Mazzola, Matthias Troyer. We introduce a novel Simulated Quantum Annealing (SQA) algorithm which employs a multispin quantum fluctuation operator. At variance with the usual transverse field, short-range two-spin flip interactions are inclu ...
Read moreJan 24, 2017 | quant-ph
Operator Locality in Quantum Simulation of Fermionic Models
Vojtěch Havlíček, Matthias Troyer, James D. Whitfield. Simulating fermionic lattice models with qubits requires mapping fermionic degrees of freedom to qubits. The simplest method for this task, the Jordan-Wigner transformation, yields strings of Pau ...
Read moreJan 23, 2017 | quant-ph
Assessment of Quantum Annealing for the Construction of Satisfiability Filters
Marlon Azinović, Daniel Herr, Bettina Heim, Ethan Brown, Matthias Troyer. Satisfiability filters, introduced by S. A. Weaver et al. in 2014, are a new and promising type of filters to address set membership testing. In order to construct satisfiabili ...
Read moreJan 19, 2017 | cond-mat.mtrl-sci, cond-mat.mes-hall
Hidden Weyl Points in Centrosymmetric Paramagnetic Metals
Dominik Gresch, QuanSheng Wu, Georg W. Winkler, Alexey A. Soluyanov. The transition metal dipnictides TaAs2 , TaSb2 , NbAs2 and NbSb2 have recently sparked interest for exhibiting giant magnetoresistance. While the exact nature of magnetoresistance i ...
Read moreJan 13, 2017 | cond-mat.str-el
Interaction effects in a microscopic quantum wire model with strong spin-orbit interaction
Georg W. Winkler, Martin Ganahl, Dirk Schuricht, Hans Gerd Evertz, Sabine Andergassen. We investigate the effect of strong interactions on the spectral properties of quantum wires with strong Rashba spin-orbit interaction in a magnetic field, using a ...
Read moreDec 23, 2016 | quant-ph, cs.ET, cs.PL
ProjectQ: An Open Source Software Framework for Quantum Computing
Damian S. Steiger, Thomas Häner, Matthias Troyer. We introduce ProjectQ, an open source software effort for quantum computing. The first release features a compiler framework capable of targeting various types of hardware, a high-performance simulato ...
Read moreDec 19, 2016 | cond-mat.quant-gas, physics.comp-ph, quant-ph
Unitary dynamics of strongly-interacting Bose gases with time-dependent variational Monte Carlo in continuous space
Giuseppe Carleo, Lorenzo Cevolani, Laurent Sanchez-Palencia, Markus Holzmann. We introduce time-dependent variational Monte Carlo for continuous-space Bose gases. Our approach is based on the systematic expansion of the many-body wave-function in ter ...
Read moreDec 15, 2016 | physics.comp-ph, cond-mat.str-el
Updated Core Libraries of the ALPS Project
A. Gaenko, A. E. Antipov, G. Carcassi, T. Chen, X. Chen, Q. Dong, L. Gamper, J. Gukelberger, R. Igarashi, S. Iskakov, M. Könz, J. P. F. LeBlanc, R. Levy, P. N. Ma, J. E. Paki, H. Shinaoka, S. Todo, M. Troyer, E. Gull. The open source ALPS (Algorithms ...
Read moreDec 12, 2016 | cond-mat.mes-hall
Experimental Signatures of the Inverted Phase in InAs/GaSb Coupled Quantum Wells
Matija Karalic, Susanne Mueller, Christopher Mittag, Kiryl Pakrouski, QuanSheng Wu, Alexey A. Soluyanov, Matthias Troyer, Thomas Tschirky, Werner Wegscheider, Klaus Ensslin, Thomas Ihn. Transport measurements are performed on InAs/GaSb double quantum ...
Read moreNov 23, 2016 | quant-ph, cs.ET
Factoring using 2n+2 qubits with Toffoli based modular multiplication
Thomas Häner, Martin Roetteler, Krysta M. Svore. We describe an implementation of Shor's quantum algorithm to factor n-bit integers using only 2n+2 qubits. In contrast to previous space-optimized implementations, ours features a purely Toffoli based ...
Read moreNov 22, 2016 | cond-mat.mtrl-sci, cond-mat.mes-hall
Z2Pack: Numerical Implementation of Hybrid Wannier Centers for Identifying Topological Materials
Dominik Gresch, Gabriel Autès, Oleg V. Yazyev, Matthias Troyer, David Vanderbilt, B. Andrei Bernevig, Alexey A. Soluyanov. The intense theoretical and experimental interest in topological insulators and semimetals has established band structure topol ...
Read moreOct 13, 2016 | cond-mat.mes-hall, cond-mat.dis-nn
Quantum Interference Effects in Topological Nanowires In a Longitudinal Magnetic Field
Vincent E. Sacksteder IV, Quansheng Wu. We study the magnetoconductance of topological insulator nanowires in a longitudinal magnetic field, including Aharonov-Bohm, Altshuler-Aronov-Spivak, perfectly conducting channel, and universal conductance flu ...
Read moreSep 21, 2016 | quant-ph, cond-mat.stat-mech
Non-Stoquastic Hamiltonians and Quantum Annealing of Ising Spin Glass
L. Hormozi, E. W. Brown, G. Carleo, M. Troyer. We study quantum annealing with non-stoquastic Hamiltonians and examine their performance in solving optimization problems. We implement non-stoquastic Hamiltonians by adding antiferromagnetically couple ...
Read moreSep 21, 2016 | quant-ph
Optimal Circuit-Level Decoding for Surface Codes
Bettina Heim, Krysta M. Svore, Matthew B. Hastings. Surface codes exploit topological protection to increase error resilience in quantum computing devices and can in principle be implemented in existing hardware. They are one of the most promising ca ...
Read moreSep 12, 2016 | cond-mat.mtrl-sci, cond-mat.supr-con
Observation of Large Topologically Trivial Fermi-Arcs in the Candidate Type-II Weyl Semimetal WTe2
F. Y. Bruno, A. Tamai, Q. S. Wu, I. Cucchi, C. Barreteau, A. de la Torre, S. McKeown Walker, S. Riccò, Z. Wang, T. K. Kim, M. Hoesch, M. Shi, N. C. Plumb, E. Giannini, A. A. Soluyanov, F. Baumberger. We report angle-resolved photoemission experiments ...
Read moreSep 10, 2016 | cond-mat.str-el
Accurate exchange-correlation energies for the warm dense electron gas
Fionn D. Malone, N. S. Blunt, Ethan W. Brown, D. K. K. Lee, J. S. Spencer, W. M. C. Foulkes, James J. Shepherd. Density matrix quantum Monte Carlo (DMQMC) is used to sample exact-on-average $N$-body density matrices for uniform electron gas systems o ...
Read moreSep 7, 2016 | cond-mat.str-el, cond-mat.stat-mech
High-Temperature Series Expansion for Spin-1/2 Heisenberg Models
Andreas Hehn, Natalija van Well, Matthias Troyer. We present a high-temperature series expansion code for spin-1/2 Heisenberg models on arbitrary lattices. As an example we demonstrate how to use the application for an anisotropic triangular lattice ...
Read moreSep 5, 2016 | cond-mat.stat-mech
Spreading of correlations in exactly-solvable quantum models with long-range interactions in arbitrary dimensions
Lorenzo Cevolani, Giuseppe Carleo, Laurent Sanchez-Palencia. We study the out-of-equilibrium dynamics induced by quantum quenches in quadratic Hamiltonians featuring both short- and long-range interactions. The spreading of correlations in the presen ...
Read moreAug 29, 2016 | quant-ph, cond-mat.str-el
Hybrid quantum-classical approach to correlated materials
Bela Bauer, Dave Wecker, Andrew J. Millis, Matthew B. Hastings, M. Troyer. Recent improvements in control of quantum systems make it seem feasible to finally build a quantum computer within a decade. While it has been shown that such a quantum comput ...
Read moreAug 25, 2016 | cond-mat.mes-hall
Nodal-chain metals
Tomáš Bzdušek, QuanSheng Wu, Andreas Rüegg, Manfred Sigrist, Alexey A. Soluyanov. The band theory of solids is arguably the most successful theory of condensed matter physics, providing the description of the electronic energy levels in a variety of ...
Read moreAug 5, 2016 | cond-mat.str-el, cond-mat.mes-hall
The enigmatic 12/5 fractional quantum Hall effect
Kiryl Pakrouski, Matthias Troyer, Yang-Le Wu, Sankar Das Sarma, Michael R. Peterson. We numerically study the fractional quantum Hall effect at filling factors $\nu=12/5$ and 13/5 (the particle-hole conjugate of 12/5) in high-quality two-dimensional ...
Read moreJul 29, 2016 | physics.comp-ph, physics.chem-ph
Accelerated nuclear quantum effects sampling with open path integrals
Guglielmo Mazzola, Matthias Troyer. We numericaly demonstrate that, in double well models, the autocorrelation time of open path integral Monte Carlo simulations can be much smaller compared to standard ones using ring polymers. We also provide an in ...
Read moreJul 28, 2016 | cond-mat.mtrl-sci, cond-mat.mes-hall
MoTe2: A Type-II Weyl Topological Metal
Zhijun Wang, Dominik Gresch, Alexey A. Soluyanov, Weiwei Xie, S. Kushwaha, Xi Dai, Matthias Troyer, Robert J. Cava, B. Andrei Bernevig. Based on the ab initio calculations, we show that MoTe2, in its low-temperature orthorhombic structure characteriz ...
Read moreJul 21, 2016 | cond-mat.quant-gas, cond-mat.str-el, physics.comp-ph
Density redistribution effects in fermionic optical lattices
Medha Soni, Michele Dolfi, Matthias Troyer. We simulate a one dimensional fermionic optical lattice to analyse heating due to non-adiabatic lattice loading. Our simulations reveal that, similar to the bosonic case, density redistribution effects are ...
Read moreJul 21, 2016 | cond-mat.mtrl-sci
Fermi arcs and their topological character in the candidate type-II Weyl semimetal MoTe2
A. Tamai, Q. S. Wu, I. Cucchi, F. Y. Bruno, S. Ricco, T. K. Kim, M. Hoesch, C. Barreteau, E. Giannini, C. Bernard, A. A. Soluyanov, F. Baumberger. We report a combined experimental and theoretical study of the candidate type-II Weyl semimetal MoTe2. ...
Read moreJul 18, 2016 | cond-mat.mes-hall
Topological Phases in InAs$_{1-x}$Sb$_x$: From Novel Topological Semimetal to Majorana Wire
Georg W. Winkler, QuanSheng Wu, Matthias Troyer, Peter Krogstrup, Alexey A. Soluyanov. Superconductor proximitized one-dimensional semiconductor nanowires with strong spin-orbit interaction (SOI) are at this time the most promising candidates for the ...
Read moreJul 7, 2016 | cond-mat.str-el, cond-mat.mtrl-sci, cond-mat.stat-mech, physics.comp-ph
Accelerated ab-initio Molecular Dynamics: probing the weak dispersive forces in dense liquid hydrogen
Sandro Sorella, Guglielmo Mazzola. We propose an ab-initio molecular dynamics method, capable to reduce dramatically the autocorrelation time required for the simulation of classical and quantum particles at finite temperature. The method is based on ...
Read moreJun 25, 2016 | cond-mat.mes-hall, cond-mat.mtrl-sci
Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides XP$_2$ (X = Mo, W)
G. Autès, D. Gresch, M. Troyer, A. A. Soluyanov, O. V. Yazyev. The recently discovered type-II Weyl points appear at the boundary between electron and hole pockets. Type-II Weyl semimetals that host such points are predicted to exhibit a new type of ...
Read moreFeed source: arxiv.org