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| Open AccessConstraints on nonlocality in networks from no-signaling and independence
The no-signaling principle constrains which multipartite correlations are allowed, but network scenarios considered so far were limited to specific cases. Here, the authors apply inflation technique to the no-input/binary-output triangle network, and show that it admits non-trilocal distributions.
- Nicolas Gisin
- , Jean-Daniel Bancal
- & Nicolas Brunner
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Article
| Open AccessEfficiency fluctuations and noise induced refrigerator-to-heater transition in information engines
Information engines, also known as Maxwell demons, model the interplay between information transfer and work extraction in non-equilibrium systems or even living systems. Here, the authors show that noisy engines are more efficient then perfect ones in extracting work from information.
- Govind Paneru
- , Sandipan Dutta
- & Hyuk Kyu Pak
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Article
| Open AccessDecoding quantum errors with subspace expansions
Fault-tolerant quantum computation is still far, but there could be ways in which quantum error correction could improve currently available devices. Here, the authors show how to exploit existing quantum codes through only post-processing and random measurements in order to mitigate errors in NISQ devices.
- Jarrod R. McClean
- , Zhang Jiang
- & Hartmut Neven
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| Open AccessError-mitigated quantum gates exceeding physical fidelities in a trapped-ion system
Quantum error mitigation promises to improve expectation values’ estimation without the resource overhead of quantum error correction. Here, the authors test probabilistic error cancellation using trapped ions, decreasing single- and two-qubit gates’ error rates by two and one order of magnitude respectively.
- Shuaining Zhang
- , Yao Lu
- & Kihwan Kim
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Article
| Open AccessA poor man’s coherent Ising machine based on opto-electronic feedback systems for solving optimization problems
Coherent Ising machines are an unconventional optical computing architecture for solving optimization problems. Böhm et al. present a design based on opto-electronic feedback systems that avoids using nonlinear optical materials, improving the prospects for scalability and reliable operation.
- Fabian Böhm
- , Guy Verschaffelt
- & Guy Van der Sande
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Article
| Open AccessGlobal labor flow network reveals the hierarchical organization and dynamics of geo-industrial clusters
There is a lack of systematic approaches to identify and analyze the hierarchical structure of geo-industrial clusters at the global scale. Here the authors use LinkedIn's employment history data to construct a global labor flow network from which they find that the resulting geo-industrial clusters exhibit a stronger association between the influx of educated-workers and financial performance compared to existing aggregation units.
- Jaehyuk Park
- , Ian B. Wood
- & Yong-Yeol Ahn
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Article
| Open AccessVariational consistent histories as a hybrid algorithm for quantum foundations
The Consistent Histories formalism can solve paradoxes in quantum mechanics, but finding such consistent sets of histories requires a computational overhead which is exponential in the problem’s size. Here, the authors report a variational hybrid algorithm solving this problem using polynomial resources.
- Andrew Arrasmith
- , Lukasz Cincio
- & Patrick J. Coles
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Article
| Open AccessReversing the direction of heat flow using quantum correlations
The presence of correlations can strongly affect the evolution of a quantum system. Here, the authors directly observe differences in the dynamics of two spins-1/2 systems in an NMR setup depending on the correlations of the initial state, including differences in energy flow and mutual information.
- Kaonan Micadei
- , John P. S. Peterson
- & Eric Lutz
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Article
| Open AccessA space–time tradeoff for implementing a function with master equation dynamics
Deterministic maps from initial to final states can always be modelled using the master equation formalism, provided additional “hidden” states are available. Here, the authors demonstrate a tradeoff between the required number of such states and the number of required, suitably defined “hidden time steps”.
- David H. Wolpert
- , Artemy Kolchinsky
- & Jeremy A. Owen
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Article
| Open AccessA continuous-time MaxSAT solver with high analog performance
Continuous-time computation paradigm could represent a viable alternative to the standard digital one when dealing with certain classes of problems. Here, the authors propose a generalised version of a continuous-time solver and simulate its performances in solving MaxSAT and two-colour Ramsey problems.
- Botond Molnár
- , Ferenc Molnár
- & Mária Ercsey-Ravasz
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Article
| Open AccessQuantum machine learning for electronic structure calculations
With the rapid development of quantum computers, quantum machine learning approaches are emerging as powerful tools to perform electronic structure calculations. Here, the authors develop a quantum machine learning algorithm, which demonstrates significant improvements in solving quantum many-body problems.
- Rongxin Xia
- & Sabre Kais
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Article
| Open AccessMemory effects can make the transmission capability of a communication channel uncomputable
In information theory one is interested in how much information can be reliably sent over noisy communication channels. Here the authors show that for channels with memory the optimal rate of information transmission is uncomputable.
- David Elkouss
- & David Pérez-García
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Article
| Open AccessStatistical ensembles without typicality
The minimal amount of assumptions to justify the use of maximum-entropy ensembles is still debated. Here, the authors show that the transitions that a partially known system environment can undergo are the same allowed for the maximum entropy state which is compatible with the known information.
- Paul Boes
- , Henrik Wilming
- & Rodrigo Gallego
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Article
| Open AccessInput–output maps are strongly biased towards simple outputs
Algorithmic information theory measures the complexity of strings. Here the authors provide a practical bound on the probability that a randomly generated computer program produces a given output of a given complexity and apply this upper bound to RNA folding and financial trading algorithms.
- Kamaludin Dingle
- , Chico Q. Camargo
- & Ard A. Louis
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| Open AccessPractical device-independent quantum cryptography via entropy accumulation
The security of DIQKD is difficult to prove, as one needs to take into account every possible attack strategy. Here, the authors develop a method to determine the entropy of a system as the sum of the entropies of its parts. Applied to DIQKD, this implies that it suffices to consider i.i.d. attacks.
- Rotem Arnon-Friedman
- , Frédéric Dupuis
- & Thomas Vidick
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Article
| Open AccessAn equation-of-state-meter of quantum chromodynamics transition from deep learning
The large data generated in heavy-ion collision experiments require careful analysis to understand the physics. Here the authors use the deep-learning method to sort equation of states in QCD transition and analyze the simulated data sets mimicking the heavy-ion collision experiments.
- Long-Gang Pang
- , Kai Zhou
- & Xin-Nian Wang
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Article
| Open AccessCapacity estimation and verification of quantum channels with arbitrarily correlated errors
Estimating the quantum capacity allows one to assess the performance of quantum memories, communication channels, repeaters as well as error correction schemes. Here, the authors show how to estimate and verify one-shot quantum capacity in the most general case of arbitrarily correlated errors.
- Corsin Pfister
- , M. Adriaan Rol
- & Stephanie Wehner
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Article
| Open AccessGeneralized laws of thermodynamics in the presence of correlations
In presence of inter-system correlations, violations of the laws of thermodynamics become possible. Here, the authors develop a formalism redefining heat, work and thermodynamic laws in terms of quantum conditional entropy, which consistently generalize thermodynamics in correlated scenarios.
- Manabendra N. Bera
- , Arnau Riera
- & Andreas Winter
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| Open AccessRound complexity in the local transformations of quantum and classical states
Operational paradigms for distributed quantum and classical information processing involve multiple rounds of public communication. Here the authors consider the minimum number of communication rounds needed to perform the locality-constrained task of entanglement transformation.
- Eric Chitambar
- & Min-Hsiu Hsieh
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Article
| Open AccessComplete 3-Qubit Grover search on a programmable quantum computer
Grover’s algorithm provides a quantum speedup when searching through an unsorted database. Here, the authors perform it on 3 qubits using trapped ions, demonstrating two methods for marking the correct result in the algorithm’s oracle and providing data for searches yielding 1 or 2 solutions.
- C. Figgatt
- , D. Maslov
- & C. Monroe
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Article
| Open AccessMachine learning meets complex networks via coalescent embedding in the hyperbolic space
Mapping complex networks to underlying geometric spaces can help understand the structure of networked systems. Here the authors propose a class of machine learning algorithms for efficient embedding of large real networks to the hyperbolic space, with potential impact on big network data analysis.
- Alessandro Muscoloni
- , Josephine Maria Thomas
- & Carlo Vittorio Cannistraci
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| Open AccessFast-forwarding of Hamiltonians and exponentially precise measurements
A complete theory of when and to what extent time-energy uncertainty relation violations can occur is lacking. Here, the authors set the ground for a rigorous theory to investigate this possibility.
- Yosi Atia
- & Dorit Aharonov
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Article
| Open AccessExperimental quantum compressed sensing for a seven-qubit system
Quantum compressed sensing can provide a scalable way to characterize quantum states and devices, but has been so far limited to states with quickly decaying eigenvalues. Here the authors show that it can be appropriate even in the general case, demonstrating reconstruction the state of a seven-qubit system.
- C. A. Riofrío
- , D. Gross
- & J. Eisert
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Article
| Open AccessQuantum vertex model for reversible classical computing
Solutions of computations can be encoded in the ground state of many-body spin models. Here the authors show that solutions to generic reversible classical computations can be encoded in the ground state of a vertex model, which can be reached without finite temperature phase transitions.
- C. Chamon
- , E. R. Mucciolo
- & Z.-C. Yang
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| Open AccessFundamental limits of repeaterless quantum communications
Quantum communications will be used to transmit entanglement and secure keys, but it is important to estimate their optimal transfer rates. Here the authors compute the fundamental limit of repeaterless quantum communications for the most relevant practical scenario.
- Stefano Pirandola
- , Riccardo Laurenza
- & Leonardo Banchi
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Article
| Open AccessMetamaterial bricks and quantization of meta-surfaces
Controlling acoustic fields is of interest for diverse applications. Here the authors develop metasurfaces using a small set of pre-manufactured three-dimensional unit cells, quantized in both the spatial and phase domains, achieving with them acoustic levitation.
- Gianluca Memoli
- , Mihai Caleap
- & Sriram Subramanian
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| Open AccessThe backtracking survey propagation algorithm for solving random K-SAT problems
The K-satisfability problem is a combinatorial discrete optimization problem, which for K=3 is NP-complete, and whose random formulation is of interest for understanding computational complexity. Here, the authors introduce the backtracking survey propagation algorithm for studying it for K=3 and K=4.
- Raffaele Marino
- , Giorgio Parisi
- & Federico Ricci-Tersenghi
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Article
| Open AccessA physical zero-knowledge object-comparison system for nuclear warhead verification
Zero-knowledge proofs can be used to prove that a statement is true without revealing why it is. Here the authors demonstrate a non-electronic fast neutron radiography technique to confirm that two objects are identical without revealing any details about their design or composition.
- Sébastien Philippe
- , Robert J. Goldston
- & Francesco d’Errico
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Emergence of coherence via transverse condensation in a uniform quasi-two-dimensional Bose gas
Interacting quantum many-body systems in low dimensions is an active research area in ultra-cold gases. Here, Chomaz et al.study the dimensional crossover of Bose–Einstein condensation and observe the emergence of phase coherence in an ultra-cold quasi-2D Bose gas confined to a flat-bottom trapping potential.
- Lauriane Chomaz
- , Laura Corman
- & Jean Dalibard
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| Open AccessMutual information reveals multiple structural relaxation mechanisms in a model glass former
One mystery of glass transition from supercooled liquid is the lack of apparent change in structure, which is in contrast to a large change in dynamics. Here Dunleavy et al. provide a possible solution to this discrepancy by simulating dynamic correlation using a mutual information approach.
- Andrew J. Dunleavy
- , Karoline Wiesner
- & C. Patrick Royall
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Predicting commuter flows in spatial networks using a radiation model based on temporal ranges
Mathematical tools for understanding network flows with a social component are much less developed than for, say, electric circuits. Ren et al. introduce a method by generalizing the radiation model to flows in spatial networks, which they apply to predict commuter flows in a highway network.
- Yihui Ren
- , Mária Ercsey-Ravasz
- & Zoltán Toroczkai
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Article
| Open AccessMagnon transistor for all-magnon data processing
A disturbance in the local magnetic order can propagate across a material just like a wave. Chumak et al.now demonstrate a transistor operating on a single quantum of these so-called spin waves, known as a magnon, which could be a central element for magnetic-material-based information processing.
- Andrii V. Chumak
- , Alexander A. Serga
- & Burkard Hillebrands
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Review Article |
Ferroelectric tunnel junctions for information storage and processing
Computer memory based on ferroelectric polarization is a promising alternative to technologies based, for example, on magnetism. Here, Garcia and Bibes review how ferroelectric tunnel junctions, where ferroelectric polarization controls electrical resistance, could improve the performance of these devices.
- Vincent Garcia
- & Manuel Bibes
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| Open AccessReconstructing propagation networks with natural diversity and identifying hidden sources
The structure of many complex systems is usually difficult to determine. Zhesi Shen et al. adapt a signal-processing technique known as compressed sensing to reconstruct the dynamics and structure of a complex propagation network from a small amount of time series data.
- Zhesi Shen
- , Wen-Xu Wang
- & Ying-Cheng Lai