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

Jun 26, 2017 | 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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Jun 14, 2017 | quant-ph

Fermionic Hamiltonians for quantum simulations: a general reduction scheme

Panagiotis Kl. Barkoutsos, Nikolaj Moll, Peter W. J. Staar, Peter Mueller, Andreas Fuhrer, Stefan Filipp, Matthias Troyer, Ivano Tavernelli. Many-body fermionic quantum calculations performed on analog quantum computers are restricted by the presence ...

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Jun 9, 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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Jun 2, 2017 | cond-mat.stat-mech, cond-mat.quant-gas, hep-th, quant-ph

Universal Scaling Laws for Correlation Spreading in Quantum Systems with Short- and Long-Range Interactions

Lorenzo Cevolani, Julien Despres, Giuseppe Carleo, Luca Tagliacozzo, Laurent Sanchez-Palencia. We study the spreading of information in a wide class of quantum systems, with variable-range interactions. We show that, after a quench, it generally feat ...

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Jun 1, 2017 | 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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May 31, 2017 | cond-mat.str-el

Quasiparticle Interference of Surface States in Type-II Weyl Semimetal WTe$_2$

Wenhan Zhang, Quansheng Wu, Lunyong Zhang, Sang-Wook Cheong, Alexey A. Soluyanov, Weida Wu. Topological Weyl semimetal (TWS) is a metal, where low energy excitations behave like Weyl fermions of high-energy physics. It was recently shown that due to ...

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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 ...

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May 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 ...

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May 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 ...

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Apr 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 ...

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Apr 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 ...

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Apr 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 ...

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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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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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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 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 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

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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