Quantum simulation articles within Nature Communications

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  • Article
    | Open Access

    The authors experimentally study a chain of superconducting islands (SI) and quantum dots (QD), where a Bogoliubov quasiparticle occupies each SI. They demonstrate correlations between the quasiparticles in each SI mediated by a single spin on the QD, known as an “over-screened" doublet state of the QD.

    • Juan Carlos Estrada Saldaña
    • , Alexandros Vekris
    •  & Jesper Nygård

  • Article
    | Open Access

    Interesting non-Hermitian quantum dynamics can be accessed in analogue quantum simulators consisting of Hermitian bosonic systems with squeezing and antisqueezing terms. Here, the authors use a coplanar waveguide resonator connected to a SQUID to simulate the bosonic version of the Kitaev chain.

    • Jamal H. Busnaina
    • , Zheng Shi
    •  & Christopher M. Wilson

  • Article
    | Open Access

    Studying bounds on the speed of information propagation across interacting boson systems is notoriously difficult. Here, the authors find tight bounds for both the transport of boson particles and information propagation, for arbitrary time-dependent Bose-Hubbard-type Hamiltonians in arbitrary dimensions.

    • Tomotaka Kuwahara
    • , Tan Van Vu
    •  & Keiji Saito

  • Article
    | Open Access

    Strongly interacting interlayer excitons and the interplay between excitons and electronic states have recently been studied in moire superlattices. Here the authors study moire WS2/WSe2 heterobilayer with tuneable electron and exciton populations and find signatures of an excitonic Mott insulating state.

    • Beini Gao
    • , Daniel G. Suárez-Forero
    •  & Mohammad Hafezi

  • Article
    | Open Access

    The ability to characterize large and complex nuclear-spin networks could enable quantum applications, such as quantum simulations of many-body physics. Here the authors develop a high-resolution quantum-sensing method and use it to image a network of 50 nuclear spins surrounding a single NV center in diamond.

    • G. L. van de Stolpe
    • , D. P. Kwiatkowski
    •  & T. H. Taminiau

  • Article
    | Open Access

    Detection of topological phases in experiments is challenging, especially in the presence of incoherent noise. Cong et al. introduce a novel method combining error correction and renormalization-group flow and apply it to characterization of quantum spin liquid phases realized in a Rydberg-atom simulator.

    • Iris Cong
    • , Nishad Maskara
    •  & Mikhail D. Lukin

  • Article
    | Open Access

    The use of NISQ devices for useful quantum simulations of materials and chemistry is still mainly limited by the necessary circuit depth. Here, the authors propose to combine classically-generated effective Hamiltonians, hybrid fermion-to-qubit mapping and circuit optimisations to bring this requirement closer to experimental feasibility.

    • Laura Clinton
    • , Toby Cubitt
    •  & Evan Sheridan

  • Article
    | Open Access

    Thermal fluctuations can induce ordering in frustrated magnetic systems, yet the impact of quantum fluctuations is less explored. Here, in the controlled environment of a quantum annealer composed of superconducting qubits, the authors study a frustrated magnetic system finding that quantum fluctuations enhance magnetic correlations.

    • Alejandro Lopez-Bezanilla
    • , Andrew D. King
    •  & Avadh Saxena

  • Article
    | Open Access

    The authors demonstrate a method controlling the lattice filling of doped 1D Bose-Hubbard system of Rb atoms composed of chains of 3 to 6 sites in an optical lattice. The control is achieved by changing of the light potential and interaction strength.

    • Andrea Di Carli
    • , Christopher Parsonage
    •  & Stefan Kuhr

  • Article
    | Open Access

    Learning Hamiltonians or Lindbladians of quantum systems from experimental data is important for characterization of interactions and noise processes in quantum devices. Here the authors propose an efficient protocol based on estimating time derivatives using multiple temporal sampling points and robust polynomial interpolation.

    • Daniel Stilck França
    • , Liubov A. Markovich
    •  & Johannes Borregaard

  • Article
    | Open Access

    Photonic waveguide lattices implementing continuous quantum walks have a wide range of applications yet remain based on static devices. Here, the authors demonstrated a fully programmable waveguide array by implementing various Hamiltonians.

    • Yang Yang
    • , Robert J. Chapman
    •  & Alberto Peruzzo

  • Article
    | Open Access

    Synthetic gauge field in ultracold atoms provides a controllable platform for the study of quantum many-body physics. Here the authors demonstrate frustrated chiral dynamics in synthetic triangular flux ladder under strong interaction using ultracold Cs atoms.

    • Yuqing Li
    • , Huiying Du
    •  & Suotang Jia

  • Article
    | Open Access

    The physics of confinement manifested in quantum spin chain models has been recently studied in quantum simulators. Here the authors report a numerical study of confinement of soliton excitations in a nonintegrable bosonic quantum field theory realized with a superconducting quantum electronic circuit.

    • Ananda Roy
    •  & Sergei L. Lukyanov

  • Article
    | Open Access

    The authors propose an implementation of Floquet non-Abelian topological insulators in a 1D three-band system with parity-time symmetry. Furthermore, they demonstrate that the bulk-edge correspondence is multifold and follows the multiplication rule of a quaternion group.

    • Tianyu Li
    •  & Haiping Hu

  • Article
    | Open Access

    Performing quantum computing in the NISQ era requires reliable information on the gate noise characteristics and their performance benchmarks. Here, the authors show how to estimate the individual noise properties of any quantum process from the noisy eigenvalues of its corresponding quantum channel.

    • Yanwu Gu
    • , Wei-Feng Zhuang
    •  & Dong E. Liu

  • Article
    | Open Access

    Quantum simulations of topological matter with superconducting qubits have been attracting attention recently. Xiang et al. realize 2D and bilayer Chern insulators with synthetic dimensions on a programmable 30-qubit-ladder superconducting processor, showing bulk-boundary correspondence.

    • Zhong-Cheng Xiang
    • , Kaixuan Huang
    •  & Heng Fan

  • Article
    | Open Access

    Rydberg atom arrays are a promising platform for simulating many-body systems. The authors introduce a tensor-network method to compute phase diagrams of infinite arrays with long-range interactions and experimental-scale finite arrays, unveiling a new entangled phase and offering a guide for experiments.

    • Matthew J. O’Rourke
    •  & Garnet Kin-Lic Chan

  • Article
    | Open Access

    It is often assumed that systems that can be analyzed accurately via mean-field theory would not be worth looking at using quantum algorithms, given entanglement plays no key role. Here, the authors show instead that a quantum advantage can be expected for simulating the exact time evolution of such electronic systems.

    • Ryan Babbush
    • , William J. Huggins
    •  & Joonho Lee

  • Article
    | Open Access

    Experimental studies about the trainability and generalization capacities of quantum neural networks are highly in need. Here, the authors implement a previously proposed parametrization and training scheme using a 6-qubit superconducting quantum processor.

    • Xiaoxuan Pan
    • , Zhide Lu
    •  & Luyan Sun

  • Article
    | Open Access

    The emergence of relaxation in unitarily evolving systems can be seen as a paradox, but not once the distinction between local and global dynamics is considered. Here, the authors use photons in an integrated optical interferometer to show that, for a system evolving unitarily on a global level, single-mode measurements converge to those of a thermal state.

    • F. H. B. Somhorst
    • , R. van der Meer
    •  & J. J. Renema

  • Article
    | Open Access

    Low-energy excitations of strongly correlated systems are described by the Tomonaga–Luttinger liquid theory. Here the authors employ Bragg spectroscopy to demonstrate a spin-incoherent Luttinger liquid in 6Li atoms using charge and spin excitations.

    • Danyel Cavazos-Cavazos
    • , Ruwan Senaratne
    •  & Randall G. Hulet

  • Article
    | Open Access

    Measurement-induced phase transitions are notoriously difficult to observe. Here, the authors propose a neural-network-based method to map measurement outcomes to the state of reference qubits, allowing observation of the transition and extracting its critical exponents.

    • Hossein Dehghani
    • , Ali Lavasani
    •  & Michael J. Gullans

  • Article
    | Open Access

    Classical mechanics predicts a bistability in the dynamics of the Duffing oscillator, a key model of nonlinear dynamics. By performing quantum simulations of the model, Chen et al. explain the bistability by quantum metastable states with long lifetimes and reveal a first-order dissipative phase transition.

    • Qi-Ming Chen
    • , Michael Fischer
    •  & Rudolf Gross

  • Article
    | Open Access

    Quantum technologies allow memory advantages in simulating stochastic processes, but a demonstration of this for non-Markovian processes (where the advantage would be stronger) has been missing so far. Here the authors fill this gap analytically and experimentally, using a single qubit memory to model non-Markovian processes.

    • Kang-Da Wu
    • , Chengran Yang
    •  & Thomas J. Elliott

  • Article
    | Open Access

    Superconducting quantum simulators are promising platforms for simulations of quantum many-body systems. Here the authors simulate a periodically driven 1D quantum spin model hosting Majorana zero modes on a superconducting qubit processor and propose new protocols for their detection and braiding.

    • Nikhil Harle
    • , Oles Shtanko
    •  & Ramis Movassagh

  • Article
    | Open Access

    The extent of problems in quantum chemistry for which quantum algorithms could provide a speedup is still unclear, as well as the kind of speedup one should expect. Here, the authors look at the problem of ground state energy estimation, and gather theoretical and numerical evidence for the fact that an exponential quantum advantage is unlikely for generic problems of interest.

    • Seunghoon Lee
    • , Joonho Lee
    •  & Garnet Kin-Lic Chan

  • Article
    | Open Access

    Usually, increasing the temperature of a system leads to disorder but supersolids can show the opposite trend. Here, the authors discuss the observation of a supersolid phase in a dilute gas of dysprosium atoms by increasing their temperature.

    • J. Sánchez-Baena
    • , C. Politi
    •  & T. Pohl

  • Article
    | Open Access

    Polarons are quasi-particles that emerge when impurity particle is mixed with the low-energy excitations of a medium. Here the authors study the case of atom-ion quantum mixtures and identify three separate bipolaronic regimes which can arise depending on the interaction range and strength.

    • Grigory E. Astrakharchik
    • , Luis A. Peña Ardila
    •  & Antonio Negretti

  • Article
    | Open Access

    Quantum simulators allow for experimental studies of many-body systems in complex geometries, which has rarely been addressed by theory. Here the authors study many-body Hamiltonians on generic random graphs and show that many-body effects emerge only in a small class of exceptional, highly structured graphs.

    • Joseph Tindall
    • , Amy Searle
    •  & Dieter Jaksch

  • Article
    | Open Access

    Non-equilibrium quantum many-body systems undergoing repeated measurements exhibit phase transitions in their entanglement properties. Here the authors use a superconducting quantum simulator to demonstrate an entanglement phase transition that can be mapped to a vitrification transition in the spin glass theory.

    • Jeremy Côté
    •  & Stefanos Kourtis

  • Article
    | Open Access

    Atomically precise artificial lattices of dopant-based quantum dots offer a tunable platform for simulations of interacting fermionic models. By leveraging advances in fabrication and atomic-state control, Wang et al. report quantum simulations of the 2D Fermi-Hubbard model on a 3 × 3 few-dopant quantum dot array.

    • Xiqiao Wang
    • , Ehsan Khatami
    •  & Richard Silver

  • Article
    | Open Access

    The Fermi-Hubbard model represents one of the benchmarks for testing quantum computational methods for condensed matter. Here, the authors are able to reproduce qualitative properties of the model on 1 × 8 and 2 × 4 lattices, by running a VQE-based algorithm on a superconducting quantum processor.

    • Stasja Stanisic
    • , Jan Lukas Bosse
    •  & Ashley Montanaro

  • Article
    | Open Access

    Quantum dimer models are known to host topological quantum spin liquid phases, and it has recently become possible to simulate related \({{\mathbb{Z}}}_{2}\) gauge theories with Rydberg atoms. Yan et al. compute the phase diagram of an experimentally motivated quantum dimer model on a triangular lattice with fluctuating dimer density.

    • Zheng Yan
    • , Rhine Samajdar
    •  & Zi Yang Meng

  • Article
    | Open Access

    Machine learning has been applied to problems in condensed matter physics, but its performance in an experimental setting needs testing. Zhang et al. study the effects of adversarial perturbations on a neural-network-based topological phase classifier, applied to experimental data from an NV center in diamond.

    • Huili Zhang
    • , Si Jiang
    •  & L.-M. Duan

  • Article
    | Open Access

    The study of complexity in quantum systems is a fascinating topic, which however is still in its infancy, especially at the experimental level. Here, the authors report on the observation of “small-world” characteristics in the network of quantum correlations within chains of up to 23 superconducting qubits long.

    • Eric B. Jones
    • , Logan E. Hillberry
    •  & Lincoln D. Carr

  • Article
    | Open Access

    Quantum simulators should be able to give insight on exotic physics models such as supersymmetric extensions of Standard Model. Here, the authors demonstrate a first step in this direction, realising a prototypical SUSY model (and spontaneous SUSY breaking within it) using a trapped ion quantum simulator.

    • M.-L. Cai
    • , Y.-K. Wu
    •  & L.-M. Duan

  • Article
    | Open Access

    Tailoring topological physics in optical cavity is a challenge that would allow new possibilities for the design optical components. In this paper, the authors, harnessing the potential of synthetic dimensions, experimentally demonstrate a degenerate cavity containing many optical angular momenta.

    • Mu Yang
    • , Hao-Qing Zhang
    •  & Guang-Can Guo

  • Article
    | Open Access

    Synthetic dimensions, states of a system engineered to act as if they were a reconfigurable extra spatial dimension, have been demonstrated with different systems previously. Here the authors create a synthetic dimension using Rydberg atoms and configure it to support topological edge states.

    • S. K. Kanungo
    • , J. D. Whalen
    •  & T. C. Killian

  • Article
    | Open Access

    Three-dimensional spin models with random hopping disorder are relevant to a large variety of physical systems. Here, the authors present an experimental realization of such a model in a Rydberg system with dipole-dipole coupling and show signatures of a localization-delocalization transition.

    • Carsten Lippe
    • , Tanita Klas
    •  & Herwig Ott

  • Article
    | Open Access

    Cold atoms have recently become a versatile platform for the study of quantum transport phenomena. Here the authors realize an alternative experimental scheme for quantum transport with cold atoms, by using spin-dependent impurity scattering in a spinful Fermi gas instead of spatially separated particle distributions.

    • Koki Ono
    • , Toshiya Higomoto
    •  & Yoshiro Takahashi

  • Article
    | Open Access

    Quantum simulations of lattice gauge theories are in principle scalable, but their extension to dynamically coupled matter has proven difficult. In this work, the authors use a variational quantum eigensolver to simulate a non-Abelian LGT including the effects of both gauge fields and dynamical fermions.

    • Yasar Y. Atas
    • , Jinglei Zhang
    •  & Christine A. Muschik

  • Article
    | Open Access

    The way quantum simulation algorithms are translated into specific hardware implementations often translates into additional overhead. Here, the authors improve the efficiency of Hamiltonian simulation using a method that allows efficient synthesis of multi-qubit evolutions from two-qubit interactions.

    • Laura Clinton
    • , Johannes Bausch
    •  & Toby Cubitt

  • Article
    | Open Access

    It was predicted that complex thermalizing behaviour can arise in many-body systems in the absence of disorder. Here, the authors observe non-ergodic dynamics in a tilted optical lattice that is distinct from previously studied regimes, and propose a microscopic mechanism that is due to emergent kinetic constrains.

    • Sebastian Scherg
    • , Thomas Kohlert
    •  & Monika Aidelsburger

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