Quantum Information -- Theory and Implementation


portrait Géza Giedke
Ikerbasque Research Professor

Donostia International Physics Center
Paseo Manuel de Lardizabal, 4
E-20018 Donostia-San Sebastián, Spain
Tel.: +34 943 018 289    Fax: +34 943 015 600
email: geza.giedke AT dipc DOT org
PGP Public Key 0x91171A19

Online profiles: Research lines:

Research highlights and news

  • Feb 16th, 2018 - Research paper published in Phys Rev A
    Ferroelectric nanotraps for polar molecules O. Dutta and G. Giedke Phys.~Rev.~A 97, 023416 (2018); also available at arXiv:1710.06357.
  • January 2018 Plan-Nacional project GRANAS: A novel platform for electronics and quantum electron optics based on graphene nanostructures (FIS2017-83780-P) applied for jointly with Thomas Frederiksen (DIPC/Ikerbasque) has been approved by MINECO.

  • Oct 24th, 2017 paper Acoustic Traps and Lattices for Electrons in Semiconductors mentioned in APS Physics: Synopsis: Creating Electron Lattices with Sound Waves
  • Oct 4th, 2017 - Research paper accepted in Phys Rev X
    Acoustic Traps and Lattices for Electrons in Semiconductors
    M. J. A. Schuetz, J. Knörzer, G. Giedke, L. M. K. Vandersypen, M. D. Lukin, and J. I. Cirac

    We propose and analyze a solid-state platform based on surface acoustic waves (SAWs) for trapping, cooling and controlling (charged) particles, as well as the simulation of quantum many-body systems. We develop a general theoretical framework demonstrating the emergence of effective time-independent acoustic trapping potentials for particles in two- or one-dimensional structures. As our main example we discuss in detail the generation and applications of a stationary, but movable acoustic pseudo-lattice (AL) with lattice parameters that are reconfigurable in situ. We identify the relevant figures of merit, discuss potential experimental platforms for a faithful implementation of such an acoustic lattice, and provide estimates for typical system parameters. With a projected lattice spacing on the scale of ∼ 100nm, this approach allows for relatively large energy scales in the realization of fermionic Hubbard models, with the ultimate prospect of entering the low temperature, strong interaction regime. Experimental imperfections as well as read-out schemes are discussed.

  • New group member - In September 2017, Mikel Olano joined our group at DIPC as a PhD student. He will work on quantum information processing with electrons and phonons in semiconductor nanostructures.

  • May 17th, 2017 - Research paper published in Phys Rev A
    High-fidelity hot gates for generic spin-resonator systems
    M. J. A. Schuetz, G. Giedke, L. M. K. Vandersypen, and J. I. Cirac
    Phys. Rev. A 95, 052335 (2017).

    We propose and analyze a high-fidelity hot gate for generic spin-resonator systems which allows for coherent spin-spin coupling, in the presence of a thermally populated resonator mode. Our scheme is nonperturbative in the spin-resonator coupling strength, applies to a broad class of physical systems, including, for example, spins coupled to circuit-QED and surface acoustic wave resonators as well as nanomechanical oscillators, and can be implemented readily with state-of-the-art experimental setups. We provide and numerically verify simple expressions for the fidelity of creating maximally entangled states under realistic conditions.

  • New group member - In April 2017, Maria Blanco de Paz joined the project SOPhoQua (run jointly with Dario Bercioux, Aitzol Garcia-Etxarri, and Juan José Saenz) as a PhD student.

  • February 2017 Red de Información y Tecnologias Cuánticas (FIS2016-81891-REDT) led by Juanjo García-Ripoll (CSIC-IFF) has been approved by MINECO

  • Summerschool NanoQI'17 - The summerschool Nanotechnology meets Quantum Information jointly organized by DIPC and MPQ will take place from Jul 24th to 28th and is now open for applications until April 28th.

  • Januar 2017 - Project "Spin-orbit Photonics and Quantum Applications" (PI_2016_1_0041; jointly with Dario Bercioux, Aitzol Garcia-Etxarri, and Juanjo Saenz)

  • November 2016 two new free/open journals on quantum physics with interesting publishing philosophy and refereeing model have been founded: the arXiv-overlay journal Quantum and the "peer-witnessed refereeing" journal SciPost . Good luck to these endeavours!

  • Sep 1st, 2016 - Research paper published in Phys Rev B
    Dissipative Long-Range Entanglement Generation between Electronic Spins
    M. Benito, M.J.A. Schuetz, J.I. Cirac, G. Platero, & G. Giedke
    Phys. Rev. B 94, 115404 (2016).

    We propose a scheme for deterministic generation and long-term stabilization of entanglement between two electronic spin qubits confined in spatially separated quantum dots. Our approach relies on an electronic quantum bus, consisting either of quantum Hall edge channels or surface acoustic waves, that can mediate long-range coupling between localized spins over distances of tens of micrometers. Since the entanglement is actively stabilized by dissipative dynamics, our scheme is inherently robust against noise and imperfections.

  • May 20th, 2016 - Research paper published in ACS Nano
    Quantum Mechanical Description of Raman Scattering from Molecules in Plasmonic Cavities, ACS Nano Article ASAP (2016)
    by M.K.S. Schmidt, R. Esteban, A. González-Tudela, G. Giedke, and J. Aizpurua

    Plasmon-enhanced Raman scattering can push single-molecule vibrational spectroscopy beyond a regime addressable by classical electrodynamics. We employ a quantum electrodynamics (QED) description of the coherent interaction of plasmons and molecular vibrations that reveal the emergence of nonlinearities in the inelastic response of the system. For realistic situations, we predict the onset of phonon-stimulated Raman scattering and a counterintuitive dependence of the anti-Stokes emission on the frequency of excitation. We further show that this QED framework opens a venue to analyze the correlations of photons emitted from a plasmonic cavity.

  • Summerschool - From July 11-14, 2016 the summerschool Nanotechnology meets Quantum Information (NanoQI) jointly organized by DIPC and MPQ will take place. Registration deadline is April 30th.

  • June 14, 2016 : 1st Basque Quantum Science and Technology Workshop at Nanogune, San Sebastian

  • Support the Quantum Manifesto! calling upon Member States and the European Commission to launch a EUR 1 billion Flagship-scale Initiative in Quantum Technology.

  • New group member - In Jan 2016, Dr Omjyoti Dutta joined our group at DIPC as a postdoctoral researcher. He will work on quantum simulations and engineering with cold atoms and polar molecules.