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In this section you will find our most recent preprints published on the Arxiv. Have fun scrolling around!

Mar 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 ...

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Mar 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 ...

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Mar 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 ...

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Mar 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 ...

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Mar 7, 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 ...

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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 ...

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Feb 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 ...

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Jan 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 ...

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Jan 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 ...

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Jan 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 ...

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Jan 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 ...

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Dec 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 ...

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Dec 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 ...

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Dec 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 ...

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Dec 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 ...

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Nov 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 ...

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Nov 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 ...

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Oct 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 ...

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Sep 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 ...

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Sep 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 ...

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Sep 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 ...

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Sep 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 ...

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Sep 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 ...

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Sep 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 ...

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Aug 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 ...

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Aug 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 ...

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Aug 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 ...

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Jul 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 ...

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Jul 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 ...

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Jul 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 ...

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