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Controlling quantum information processing in hybrid systems on chips

Quantum Information Processing volume 10, Article number: 1037 (2011) Cite this article

Abstract

We investigate quantum information processing, transfer and storage in hybrid systems comprised of diverse blocks integrated on chips. Strong coupling between superconducting (SC) qubits and ensembles of ultracold atoms or NV-center spins is mediated by a microwave transmission-line resonator that interacts near-resonantly with the atoms or spins. Such hybrid devices allow us to benefit from the advantages of each block and compensate for their disadvantages. Specifically, the SC qubits can rapidly implement quantum logic gates, but are “noisy” (prone to decoherence), while collective states of the atomic or spin ensemble are “quiet”(protected from decoherence) and thus can be employed for storage of quantum information. To improve the overall performance (fidelity) of such devices we discuss dynamical control to optimize quantum state-transfer from a “noisy” qubit to the “quiet” storage ensemble. We propose to maximize the fidelity of transfer and storage in a spectrally inhomogeneous spin ensemble, by pre-selecting the optimal spectral portion of the ensemble. Significant improvements of the overall fidelity of hybrid devices are expected under realistic conditions. Experimental progress towards the realization of these schemes is discussed.

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Acknowledgments

This research was supported by the EUthrough MIDAS, by DIP, the Humboldt-Meitner Award (G.K.), the Humboldt Foundation (D.P.) and the Wittgenstein Prize (J.S.)

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Affiliations

  1. Department of Chemical Physics, Weizmann Institute of Science, 76100, Rehovot, Israel

    Guy Bensky & Gershon Kurizki

  2. Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, TU-Wien, Stadionalle 2, 1020, Vienna, Austria

    Robert Amsüss, Johannes Majer & Jörg Schmiedmayer

  3. Institute of Electronic Structure and Laser, FORTH, 71110, Heraklion, Crete, Greece

    David Petrosyan

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  1. Guy Bensky
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  2. Robert Amsüss
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  3. Johannes Majer
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  4. David Petrosyan
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  5. Jörg Schmiedmayer
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  6. Gershon Kurizki
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Correspondence to Jörg Schmiedmayer.

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Bensky, G., Amsüss, R., Majer, J. et al. Controlling quantum information processing in hybrid systems on chips. Quantum Inf Process 10, 1037 (2011). https://doi.org/10.1007/s11128-011-0302-6

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Keywords

  • Quantum information
  • Hybrid quantum systems
  • Atom chip