Browsing by Department "ABB Corporate Research Center - Switzerland"

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    Pairwise tomography networks for many-body quantum systems
    (American Physical Society, 2020-06-24) Garcia-Perez, Guillermo; Rossi, Matteo A. C.; Sokolov, Boris; Borrelli, Elsi-Mari; Maniscalco, Sabrina; University of Turku; ABB Corporate Research Center - Switzerland; Centre of Excellence in Quantum Technology, QTF; Department of Applied Physics
    We introduce the concept of pairwise tomography networks to characterize quantum properties in many-body systems and demonstrate an efficient protocol to measure them experimentally. Pairwise tomography networks are generators of multiplex networks where each layer represents the graph of a relevant quantifier, such as, e.g., concurrence, quantum discord, purity, quantum mutual information, or classical correlations. We propose a measurement scheme to perform two-qubit tomography of all pairs showing exponential improvement in the number of qubits N with respect to previously existing methods. We illustrate the usefulness of our approach by means of several examples revealing its potential impact to quantum computation, communication, and simulation. We perform a proof-of-principle experiment demonstrating pairwise tomography networks of W states on IBM Q devices.