809 citations · 2.6k across the 42 of their papers we have counts for
43 papers · 1 filter
Quantum Computing for High-Energy Physics: State of the Art and Challenges. Summary of the QC4HEP Working Group
Alberto Di Meglio, Karl Jansen, Ivano Tavernelli +43
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…
Virtual mitigation of coherent non-adiabatic transitions by echo verification
Benjamin F. Schiffer, Dyon van Vreumingen, Jordi Tura +1
Transitions out of the ground space limit the performance of quantum adiabatic algorithms, while hardware imperfections impose stringent limitations on the circuit depth. We propos…
Detecting Bell correlations in multipartite non-Gaussian spin states
Jiajie Guo, Jordi Tura, Qiongyi He +1
We expand the toolbox for studying Bell correlations in multipartite systems by introducing permutationally invariant Bell inequalities (PIBIs) involving few-body correlators. Firs…
All this for one qubit? Bounds on local circuit cutting schemes
Simon C. Marshall, Jordi Tura, Vedran Dunjko
Small numbers of qubits are one of the primary constraints on the near-term deployment of advantageous quantum computing. To mitigate this constraint, techniques have been develope…
Quantum eigenstate broadcasting assisted by a coherent link
Benjamin F. Schiffer, Jordi Tura
Preparing the ground state of a local Hamiltonian is a crucial problem in understanding quantum many-body systems, with applications in a variety of physics fields and connections…
Bloch Sphere Binary Trees: A method for the visualization of sets of multi-qubit systems pure states
Alice Barthe, Michele Grossi, Jordi Tura +1
Understanding the evolution of a multi-qubit quantum system, or elucidating what portion of the Hilbert space is occupied by a quantum dataset becomes increasingly hard with the nu…
Reduce&chop: Shallow circuits for deeper problems
Adrián Pérez-Salinas, Radoica Draškić, Jordi Tura +1
State-of-the-art quantum computers can only reliably execute circuits with limited qubit numbers and computational depth. This severely reduces the scope of algorithms that can be…
Linear maps as sufficient criteria for entanglement depth and compatibility in many-body systems
Maciej Lewenstein, Guillem Müller-Rigat, Jordi Tura +1
Physical transformations are described by linear maps that are completely positive and trace preserving (CPTP). However, maps that are positive (P) but not completely positive (CP)…
Tropical contraction of tensor networks as a Bell inequality optimization toolset
Mengyao Hu, Jordi Tura
We show that finding the classical bound of broad families of Bell inequalities can be naturally framed as the contraction of an associated tensor network, but in tropical algebra,…
Unextendible product operator basis
Mengyao Hu, Lin Chen, Fei Shi +2
Quantum nonlocality is associated with the local indistinguishability of orthogonal states. Unextendible product basis (UPB), a widely used tool in quantum information, exhibits no…
Preparation and verification of tensor network states
Esther Cruz, Flavio Baccari, Jordi Tura +2
We consider a family of tensor network states defined on regular lattices that come with a natural definition of an adiabatic path to prepare them. This family comprises relevant c…
Certificates of quantum many-body properties assisted by machine learning
Borja Requena, Gorka Muñoz-Gil, Maciej Lewenstein +2
Computationally intractable tasks are often encountered in physics and optimization. Such tasks often comprise a cost function to be optimized over a so-called feasible set, which…
Adiabatic Spectroscopy and a Variational Quantum Adiabatic Algorithm
Benjamin F. Schiffer, Jordi Tura, J. Ignacio Cirac
Preparing the ground state of a Hamiltonian is a problem of great significance in physics with deep implications in the field of combinatorial optimization. The adiabatic algorithm…
Entangled symmetric states and copositive matrices
Carlo Marconi, Albert Aloy, Jordi Tura +1
Entanglement in symmetric quantum states and the theory of copositive matrices are intimately related concepts. For the simplest symmetric states, i.e., the diagonal symmetric (DS)…
Bounding the fidelity of quantum many-body states from partial information
Matteo Fadel, Albert Aloy, Jordi Tura
We formulate an algorithm to lower bound the fidelity between quantum many-body states only from partial information, such as the one accessible by few-body observables. Our method…
Robust self-testing of steerable quantum assemblages and its applications on device-independent quantum certification
Shin-Liang Chen, Huan-Yu Ku, Wenbin Zhou +2
Given a Bell inequality, if its maximal quantum violation can be achieved only by a single set of measurements for each party or a single quantum state, up to local unitaries, one…
The quantum marginal problem for symmetric states: applications to variational optimization, nonlocality and self-testing
Albert Aloy, Matteo Fadel, Jordi Tura
In this paper, we present a method to solve the quantum marginal problem for symmetric -level systems. The method is built upon an efficient semi-definite program that determine…
Bell inequalities tailored to the Greenberger-Horne-Zeilinger states of arbitrary local dimension
Remigiusz Augusiak, Alexia Salavrakos, Jordi Tura +1
In device-independent quantum information processing Bell inequalities are not only used as detectors of nonlocality, but also as certificates of relevant quantum properties. In or…
Optimization of device-independent witnesses of entanglement depth from two-body correlators
Jordi Tura, Albert Aloy, Flavio Baccari +3
In a recent work [A. Aloy et al. arXiv:1807:06027 (2018)] we have considered the characterization of entanglement depth, from a device-independent perspective, in a quantum many-bo…
Scalable Bell inequalities for qubit graph states and robust self-testing
F. Baccari, R. Augusiak, I. Šupić +2
Bell inequalities constitute a key tool in quantum information theory: they not only allow one to reveal nonlocality in composite quantum systems, but, more importantly, they can b…
Device-independent witnesses of entanglement depth from two-body correlators
Albert Aloy, Jordi Tura, Flavio Baccari +3
We consider the characterization of entanglement depth in a quantum many-body system from the device-independent perspective; i.e., certifying how many particles are genuinely enta…
Maximal nonlocality from maximal entanglement and mutually unbiased bases, and self-testing of two-qutrit quantum systems
Jędrzej Kaniewski, Ivan Šupić, Jordi Tura +3
Bell inequalities are an important tool in device-independent quantum information processing because their violation can serve as a certificate of relevant quantum properties. Prob…
Challenging local realism with human choices
The BIG Bell Test Collaboration, C. Abellán, A. Acín +105
A Bell test is a randomized trial that compares experimental observations against the philosophical worldview of local realism. A Bell test requires spatially distributed entanglem…
Bell correlations at finite temperature
Matteo Fadel, Jordi Tura
We show that spin systems with infinite-range interactions can violate at thermal equilibrium a multipartite Bell inequality, up to a finite critical temperature . Our framewo…