Controlling quantum information processing in hybrid systems on chips

  • Authors:

  • Guy Bensky;Robert Amsüss;Johannes Majer;David Petrosyan;Jörg Schmiedmayer;Gershon Kurizki

  • Affiliations:

  • Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel 76100;Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, TU-Wien, Vienna, Austria 1020;Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, TU-Wien, Vienna, Austria 1020;Institute of Electronic Structure and Laser, FORTH, Heraklion, Crete, Greece 71110;Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, TU-Wien, Vienna, Austria 1020;Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel 76100

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2011

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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.