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In this section you will find our most recent preprints published on the Arxiv. Have fun scrolling around!
May 15, 2017 | quant-ph, cond-mat.stat-mech
Nonstoquastic Hamiltonians and Quantum Annealing of an Ising Spin Glass
L. Hormozi, E. W. Brown, G. Carleo, M. Troyer. We study the role of Hamiltonian complexity in the performance of quantum annealers. We consider two general classes of annealing Hamiltonians: stoquastic ones, which can be simulated efficiently using t ...
Read moreMay 9, 2017 | physics.comp-ph, cond-mat.other
Infinite Matrix Product States vs Infinite Projected Entangled-Pair States on the Cylinder: a comparative study
Juan Osorio Iregui, Matthias Troyer, Philippe Corboz. In spite of their intrinsic one-dimensional nature matrix product states have been systematically used to obtain remarkably accurate results for two-dimensional systems. Motivated by basic entropi ...
Read moreMay 2, 2017 | cond-mat.mtrl-sci
Topological Dirac Nodal-net Fermions in AlB$_2$-type TiB$_2$ and ZrB$_2$
Xing Feng, Changming Yue, Zhida Song, QuanSheng Wu, Bin Wen. Based on first-principles calculations and effective model analysis, a Dirac nodal-net semimetal state is recognized in AlB$_2$-type TiB$_2$ and ZrB$_2$ when spin-orbit coupling (SOC) is ig ...
Read moreApr 9, 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 moreApr 5, 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 moreApr 4, 2017 | quant-ph, cs.DC, cs.ET
0.5 Petabyte Simulation of a 45-Qubit Quantum Circuit
Thomas Häner, Damian S. Steiger. Near-term quantum computers will soon reach sizes that are challenging to directly simulate, even when employing the most powerful supercomputers. Yet, the ability to simulate these early devices using classical compu ...
Read moreMar 29, 2017 | cond-mat.mes-hall, cond-mat.supr-con
Orbital contributions to the electron g-factor in semiconductor nanowires
Georg W. Winkler, Dániel Varjas, Rafal Skolasinski, Alexey A. Soluyanov, Matthias Troyer, Michael Wimmer. Recent experiments on Majorana fermions in semiconductor nanowires [Albrecht et al., Nat. 531, 206 (2016)] revealed a surprisingly large electro ...
Read moreMar 23, 2017 | quant-ph, cond-mat.mtrl-sci, physics.chem-ph, physics.comp-ph
Quantum Monte Carlo tunneling from quantum chemistry to quantum annealing
Guglielmo Mazzola, Vadim N. Smelyanskiy, Matthias Troyer. Quantum Tunneling is ubiquitous across different fields, from quantum chemical reactions, and magnetic materials to quantum simulators and quantum computers. While simulating the real-time qua ...
Read moreMar 22, 2017 | physics.comp-ph, cond-mat.mes-hall
WannierTools: An open-source software package for novel topological materials
QuanSheng Wu, ShengNan Zhang, Hai-Feng Song, Matthias Troyer, Alexey A. Soluyanov. We present an open-source software package WannierTools, a tool for investigation of novel topological materials. This code works in the tight-binding framework, which ...
Read moreMar 15, 2017 | cond-mat.dis-nn, cond-mat.quant-gas, physics.comp-ph, quant-ph
Many-body quantum state tomography with neural networks
Giacomo Torlai, Guglielmo Mazzola, Juan Carrasquilla, Matthias Troyer, Roger Melko, Giuseppe Carleo. The experimental realization of increasingly complex synthetic quantum systems calls for the development of general theoretical methods, to validate ...
Read moreFeb 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 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 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
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 moreFeed source: arxiv.org