Entanglement-assisted tomography of a quantum target

A. De Pasquale, P. Facchi, V. Giovannetti, Kazuya Yuasa

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We study the efficiency of quantum tomographic reconstruction where the system under investigation (quantum target) is indirectly monitored by looking at the state of a quantum probe that has been scattered off the target. In particular, we focus on the state tomography of a qubit through a one-dimensional scattering of a probe qubit, with a Heisenberg-type interaction. Via direct evaluation of the associated quantum CramérRao bounds, we compare the accuracy efficiency that one can obtain by adopting entanglement-assisted strategies with that achievable when entanglement resources are not available. Even though sub-shot noise accuracy levels are not attainable, we show that quantum correlations play a significant role in the estimation. A comparison with the accuracy levels obtainable by direct estimation (not through a probe) of the quantum target is also performed.

    Original languageEnglish
    Article number105309
    JournalJournal of Physics A: Mathematical and Theoretical
    Volume45
    Issue number10
    DOIs
    Publication statusPublished - 2012 Mar 16

    Fingerprint

    Tomography
    Entanglement
    tomography
    Target
    probes
    Shot noise
    Probe
    shot noise
    Qubit
    resources
    Scattering
    Shot Noise
    evaluation
    scattering
    interactions
    Resources
    Evaluation
    Interaction

    ASJC Scopus subject areas

    • Mathematical Physics
    • Physics and Astronomy(all)
    • Statistical and Nonlinear Physics
    • Modelling and Simulation
    • Statistics and Probability

    Cite this

    Entanglement-assisted tomography of a quantum target. / De Pasquale, A.; Facchi, P.; Giovannetti, V.; Yuasa, Kazuya.

    In: Journal of Physics A: Mathematical and Theoretical, Vol. 45, No. 10, 105309, 16.03.2012.

    Research output: Contribution to journalArticle

    De Pasquale, A. ; Facchi, P. ; Giovannetti, V. ; Yuasa, Kazuya. / Entanglement-assisted tomography of a quantum target. In: Journal of Physics A: Mathematical and Theoretical. 2012 ; Vol. 45, No. 10.
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