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Semiconducting double-dot exchange-only qubit dynamics in the presence of magnetic and charge noises

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Abstract

The effects of magnetic and charge noises on the dynamical evolution of the double-dot exchange-only qubit (DEOQ) is theoretically investigated. The DEOQ consisting of three electrons arranged in an electrostatically defined double quantum dot deserves special interest in quantum computation applications. Its advantages are in terms of fabrication, control and manipulation in view of implementation of fast single and two-qubit operations through only electrical tuning. The presence of the environmental noise due to nuclear spins and charge traps, in addition to fluctuations in the applied magnetic field and charge fluctuations on the electrostatic gates adopted to confine the electrons, is taken into account including random magnetic field and random coupling terms in the Hamiltonian. The behavior of the return probability as a function of time for initial conditions of interest is presented. Moreover, through an envelope-fitting procedure on the return probabilities, coherence times are extracted when model parameters take values achievable experimentally in semiconducting devices.

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Acknowledgements

This work has been funded from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No. 688539.

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Authors and Affiliations

  1. CNR-IMM, Unit of Agrate Brianza, Via C. Olivetti 2, 20864, Agrate Brianza, MB, Italy

    E. Ferraro, M. Fanciulli & M. De Michielis

  2. Dipartimento di Scienza dei Materiali, University of Milano Bicocca, Via R. Cozzi 55, 20125, Milano, Italy

    M. Fanciulli

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Correspondence to E. Ferraro.

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Ferraro, E., Fanciulli, M. & De Michielis, M. Semiconducting double-dot exchange-only qubit dynamics in the presence of magnetic and charge noises. Quantum Inf Process 17, 130 (2018). https://doi.org/10.1007/s11128-018-1896-8

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