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Preparing tunable Bell-diagonal states on a quantum computer

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Abstract

The class of two-qubit Bell-diagonal states has been the workhorse for developing understanding about the geometry, dynamics, and applications of quantum resources. In this article, we present a quantum circuit for preparing Bell-diagonal states on a quantum computer in a tunable way. We implement this quantum circuit using the IBM Q 5 Yorktown quantum computer, and as an application example, we measure the non-local, steering, entanglement, and discord quantum correlations and non-local quantum coherence of Werner states.

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Acknowledgements

This work was supported by the Brazilian National Institute for the Science and Technology of Quantum Information (INCT-IQ), process 465469/2014-0, and by the Coordination for the Improvement of Higher Education Personnel (CAPES).

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  1. Departamento de Física, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Avenida Roraima 1000, Santa Maria, RS, 97105-900, Brazil

    Mauro B. Pozzobom & Jonas Maziero

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  1. Mauro B. Pozzobom
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  2. Jonas Maziero
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Correspondence to Jonas Maziero.

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Pozzobom, M.B., Maziero, J. Preparing tunable Bell-diagonal states on a quantum computer. Quantum Inf Process 18, 142 (2019). https://doi.org/10.1007/s11128-019-2264-z

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