Publications
2024
-
Observation of microscopic confinement dynamics by a tunable topological θ-angle
Wei-Yong Zhang, Ying Liu, and Yanting Cheng et al.
Nat. Phys. 21, 155–160 ()The topological θ-angle is central to several gauge theories in condensed-matter and high-energy physics. For example, it is responsible for the strong CP problem in quantum chromodynamics and can emerge in effective theories of electrodynamics in …
-
Observing dynamical localization on a trapped-ion qudit quantum processor
Gonzalo Camacho, Claire L. Edmunds, Michael Meth, Martin Ringbauer, and Benedikt Fauseweh
arXiv:2412.13141 [quant-ph] ()The advancements of quantum processors offer a promising new window to study exotic states of matter. One striking example is the possibility of non-ergodic behaviour in systems with a large number of local degrees of freedom. Here we use a …
-
Qudit-inspired optimization for graph coloring
David Jansen, Timothy Heightman, Luke Mortimer, Ignacio Perito, and Antonio Acín
Phys. Rev. Applied 22, 064002 () | arXiv:2406.00792 [quant-ph]We introduce a quantum-inspired algorithm for graph coloring problems (GCPs) that utilizes qudits in a product state, with each qudit representing a node in the graph and parameterized by 𝑑-dimensional spherical coordinates. WWe introduce a …
-
Variational quantum simulation using non-Gaussian continuous-variable systems
Paolo Stornati, Antonio Acin, Ulysse Chabaud, Alexandre Dauphin, Valentina Parigi, and Federico Centrone
Phys. Rev. Research 6, 043212 () | arXiv:2310.15919 [quant-ph]This work introduces an approach to quantum simulation by leveraging continuous-variable systems within a photonic hardware-inspired framework. The primary focus is on simulating static properties of the ground state of Hamiltonians associated with …
-
Protein Design by Integrating Machine Learning and Quantum-Encoded Optimization
Veronica Panizza, Philipp Hauke, Cristian Micheletti, and Pietro Faccioli
PRX Life 2, 043012 () | arXiv:2407.07177 [quant-ph]The protein design problem involves finding polypeptide sequences folding into a given three-dimensional structure. Its rigorous algorithmic solution is computationally demanding, involving a nested search in sequence and structure spaces. Structure …
-
Challenges and opportunities in quantum optimization
Amira Abbas, Andris Ambainis, and Brandon Augustino et al.
Nat Rev Phys 6, 718–735 () | arXiv:2312.02279 [quant-ph]Quantum computers have demonstrable ability to solve problems at a scale beyond brute-force classical simulation. Interest in quantum algorithms has developed in many areas, particularly in relation to mathematical optimization — a broad field with …
-
Digital Quantum Simulation of a (1+1)D SU(2) Lattice Gauge Theory with Ion Qudits
Giuseppe Calajó, Giuseppe Magnifico, Claire Edmunds, Martin Ringbauer, Simone Montangero, and Pietro Silvi
PRX Quantum 5, 040309 () | arXiv:2402.07987 [quant-ph]We present a quantum simulation strategy for a (1+1)-dimensional SU(2) non-Abelian lattice gauge theory with dynamical matter, a hardcore-gluon Hamiltonian Yang-Mills, tailored to a six-level trapped-ion-qudit quantum processor, as recently …
-
MQT Qudits: A Software Framework for Mixed-Dimensional Quantum Computing
Kevin Mato, Martin Ringbauer, Lukas Burgholzer, and Robert Wille
arXiv:2410.02854 [quant-ph] ()Quantum computing holds great promise for surpassing the limits of classical devices in many fields. Despite impressive developments, however, current research is primarily focused on qubits. At the same time, quantum hardware based on multi-level, …
-
Enhancing quantum state tomography via resource-efficient attention-based neural networks
Adriano Macarone Palmieri, Guillem Müller-Rigat, Anubhav Kumar Srivastava, Maciej Lewenstein, Grzegorz Rajchel-Mieldzioc, and Marcin Płodzien
Phys. Rev. Research 6, 033248 () | arXiv:2309.10616 [quant-ph]In this paper, we propose a method for denoising experimental density matrices that combines standard quantum state tomography with an attention-based neural network architecture. The algorithm learns the noise from the data itself, without a priori …
-
Learning symmetry-protected topological order from trapped-ion experiments
Nicolas Sadoune, Ivan Pogorelov, Claire L. Edmunds, Giuliano Giudici, Giacomo Giudice, Christian D. Marciniak, Martin Ringbauer, Thomas Monz, and Lode Pollet
arXiv:2408.05017 [quant-ph] ()Classical machine learning has proven remarkably useful in post-processing quantum data, yet typical learning algorithms often require prior training to be effective. In this work, we employ a tensorial kernel support vector machine (TK-SVM) to …
-
Quantum computing for high-energy physics: State of the art and challenges
Alberto Di Meglio, Karl Jansen, Ivano Tavernelli, Constantia Alexandrou, Srinivasan Arunachalam, Christian W Bauer, Kerstin Borras, Stefano Carrazza, and Arianna Crippa et al.
PRX Quantum 5, 037001 () | arXiv:2307.03236 [quant-ph]Quantum computers offer an intriguing path for a paradigmatic change of computing in the natural sciences and beyond, with the potential for achieving a so-called quantum advantage—namely, a significant (in some cases exponential) speedup of …
-
Certifying Ground-State Properties of Many-Body System
Jie Wang, Jacopo Surace, Irénée Frérot, Benoît Legat, Marc-Olivier Renou, Victor Magron, and Antonio Acín
Phys. Rev. X 14, 031006 () | arXiv:2310.05844v5 [quant-ph]A ubiquitous problem in quantum physics is to understand the ground-state properties of many-body systems. Confronted with the fact that exact diagonalization quickly becomes impossible when increasing the system size, variational approaches are …
-
Connecting the Hamiltonian structure to the QAOA performance and energy landscape
Daniel Müssig, Markus Wappler, Steve Lenk, and Jörg Lässig
INFORMATIK 2024 () | arXiv:2407.04435 [quant-ph]Quantum computing holds promise for outperforming classical computing in specialized applications such as optimization. With current Noisy Intermediate Scale Quantum (NISQ) devices, only variational quantum algorithms like the Quantum Alternating …
-
Deconfined quantum critical points in fermionic systems with spin-charge separation
Niccolò Baldelli, Arianna Montorsi, Sergi Julià-Farré, Maciej Lewenstein, Matteo Rizzi, and Luca Barbiero
arXiv:2407.04073 [cond-mat.str-el] ()Deconfined quantum critical points are intriguing transition points not predicted by the Landau-Ginzburg-Wilson symmetry-breaking paradigm which are usually identified by the appearance of a continuous phase transition between locally ordered phases. …
-
Mixed-Dimensional Qudit State Preparation Using Edge-Weighted Decision Diagrams
Kevin Mato, Stefan Hillmich, and Robert Wille
61st ACM/IEEE Design Automation Conference (DAC ‘24) () | arXiv:2308.12332 [quant-ph]Quantum computers promise to solve several categories of problems faster than classical computers ever could. Current research mostly focuses on qubits, i.e., systems where the unit of information can assume only two levels. However, the underlying …
-
Synthetic dimensions for topological and quantum phases
Javier Argüello-Luengo, Utso Bhattacharya, Alessio Celi, Ravindra W. Chhajlany, Tobias Grass, Marcin Płodzień, Debraj Rakshit, Tymoteusz Salamon, Paolo Stornati, Leticia Tarruell, and Maciej Lewenstein
Commun Phys 7, 143 () | arXiv:2310.19549 [quant-ph]The concept of synthetic dimensions works particularly well in atomic physics, quantum optics, and photonics, where the internal degrees of freedom (Zeeman sublevels of the ground state, metastable excited states, or motional states for atoms, and …
-
A Framework for the Design and Realization of Alternative Superconducting Quantum Architectures
Jagatheesan Kunasaikaran, Kevin Mato, and Robert Wille
IEEE International Symposium on Multiple-Valued Logic 2024 () | arXiv:2305.07052 [quant-ph]Superconducting quantum hardware architectures have been designed by considering the physical constraints of the underlying physics. These general-purpose architectures leave room for customization and optimization that can be exploited with …
-
Marcin Płodzień, Tomasz Wasak, Emilia Witkowska, Maciej Lewenstein, and Jan Chwedeńczuk
Phys. Rev. Research 6, 023050 () | arXiv:2306.06173 [quant-ph]Dynamical generation of strong and scalable quantum resources, like many-body entanglement and Bell correlations, in spin-1/2 chains is possible with all-to-all interactions, either for constant interaction strength realizing one-axis twisting …
-
Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion
Javier Argüello-Luengo, Manfred J. Mark, Francesca Ferlaino, Maciej Lewenstein, Luca Barbiero, and Sergi Julià-Farré
Quantum 8, 1285 () | arXiv:2308.13375 [cond-mat.quant-gas]Thouless pumping represents a powerful concept to probe quantized topological invariants in quantum systems. We explore this mechanism in a generalized Rice-Mele Fermi-Hubbard model characterized by the presence of competing onsite and intersite …
-
Almost device-independent certification of GME states with minimal measurements
Shubhayan Sarkar, Alexandre C. Orthey Jr., Gautam Sharma, and Remigiusz Augusiak
arXiv:2402.18522 [quant-ph] ()Device-independent certification of quantum states allows the characterization of quantum states present inside a device by making minimal physical assumptions. A major problem in this regard is to certify quantum states using minimal resources. In …
-
Sublattice scars and beyond in two-dimensional U(1) quantum link lattice gauge theories
Indrajit Sau, Paolo Stornati, Debasish Banerjee, and Arnab Sen
Phys. Rev. D 109, 034519 () | arXiv:2311.06773 [hep-lat]In this article, we elucidate the structure and properties of a class of anomalous high-energy states of matter-free U(1) quantum link gauge theory Hamiltonians using numerical and analytical methods. Such anomalous states, known as quantum many-body …
-
Variational quantum simulation of U(1) lattice gauge theories with qudit systems
Pavel P. Popov, Michael Meth, Maciej Lewenstein, Philipp Hauke, Martin Ringbauer, Erez Zohar, and Valentin Kasper
Phys. Rev. Research 6, 013202 () | arXiv:2307.15173 [quant-ph]Lattice gauge theories are fundamental to various fields, including particle physics, condensed matter, and quantum information theory. Recent progress in the control of quantum systems allows for studying Abelian lattice gauge theories in table-top …
-
Edoardo Ballini, Giuseppe Clemente, Massimo D’Elia, Lorenzo Maio, and Kevin Zambello
Phys. Rev. D 109, 034510 () | arXiv:2309.07090 [quant-ph]In this paper, we show the application of the quantum Metropolis sampling (QMS) algorithm to a toy gauge theory with discrete non-Abelian gauge group \(𝐷4\) in \((2+1)-\)dimensions, discussing in general how some components of hybrid …
-
Topological stripe state in an extended Fermi-Hubbard model
Sergi Julià-Farré, Lorenzo Cardarelli, Maciej Lewenstein, Markus Müller, and Alexandre Dauphin
Phys. Rev. B 109, 075109 () | arXiv:2301.03312 [cond-mat.quant-gas]Interaction-induced topological systems have attracted a growing interest for their exotic properties going beyond the single-particle picture of topological insulators. In particular, the interplay between strong correlations and finite doping can …
-
Eigenstate thermalization and its breakdown in quantum spin chains with inhomogeneous interactions
Ding-Zu Wang, Hao Zhu, Jian Cui, Javier Argüello-Luengo, Maciej Lewenstein, Guo-Feng Zhang, Piotr Sierant, and and Shi-Ju Ran
Phys. Rev. B 109, 045139 () | arXiv:2310.19333 quant-phThe eigenstate thermalization hypothesis (ETH) is a successful theory that establishes the criteria for ergodicity and thermalization in isolated quantum many-body systems. In this work, we investigate the thermalization properties of a spin-1/2 XXZ …
-
Squeezing and quantum approximate optimization
Gopal Chandra Santra, Fred Jendrzejewski, Philipp Hauke, and Daniel J. Egger
Phys. Rev. A, 012413 () | arXiv:2205.10383 [quant-ph]Variational quantum algorithms offer fascinating prospects for the solution of combinatorial optimization problems using digital quantum computers. However, the achievable performance in such algorithms and the role of quantum correlations therein …
-
Spectral properties of the critical (1+1)-dimensional Abelian-Higgs model
Titas Chanda, Marcello Dalmonte, Maciej Lewenstein, Jakub Zakrzewski, and Luca Tagliacozzo
Phys. Rev. B 109, 045103 () | arXiv:2304.01030 [hep-th]The presence of gauge symmetry in 1+1 dimensions is known to be redundant, since it does not imply the existence of dynamical gauge bosons. As a consequence, in the continuum, the Abelian-Higgs model (i.e., the theory of bosonic matter interacting …