Quantum Information -- Theory and Implementation
Welcome
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:
- Implementation of QIP in solid-state and quantum optical systems
- Quantum information theory: entanglement, quantum channels
- Dynamics of open quantum systems
Research highlights and news
October 4, 2024- 7th Basque Quantum Science and Technology Workshop held at the Camara de Comercio in San Sebastián
New group member - On September 16th, Stephen McMillan from the University of Konstanz joined our group as a postdoc.
July 22 - 25, 2024 - Summerschool Nanotechnology meets Quantum Information 2024 (NanoQI'24) held in San Sebastián
July 2024 Research project granted
The project GRAFIQ (Harnessing quantum spin states, dynamics, and transport in graphene-based nanostructures, PID2023-146694NB-I00) led jointly with Thomas Frederiksen has been granted. It will run for four years.
January 2024 - Research paper published in Physical Review Letters
Indistinguishability of identical bosons from a quantum information theory perspective
M. Englbrecht; T. Kraft; C. Dittel; A. Buchleitner; G. Giedke & B. Kraus
Phys. Rev. Lett., 132, 050201 (2024); also available
at arXiv:2307.06626.
New group member - On October 1st, Andoni Agirre
joined our group at DIPC as a PhD student (jointly supervised withTobias Grass and Thomas Frederiksen). He will work on
tensor-network methods applied to nanographenes.
New group member - On Aug 16th, Lorenz Möhrle
from the University of Konstanz joined our group at DIPC as a summer intern. He will work on
a project concerning hyperfine interaction in nanographenes (until October).
July 2023 Research project granted
The project proposal PIBA_2023_1_0021 (Tensor network methods for interacting electrons in
quasi-1d graphene nanostructures (TENINT)), jointly led with Tobias Grass and Thomas Frederiksen has been granted by the Department of Education of the Basque Government. The project will run for two years.
July 2023 - Research visit by Alejandro
González-Tudela
(Instituto de Física Fundamental (IFF), CSIC, Madrid) (topological photonics)
Nico Leumer joined our group from The University of Strasbourg to work on spin dynamics in
nanographenes as part of the IKUR project ``Quantum register based on molecular spins and graphene nanostructures''
June 30, 2023 - Research paper published in Physical Review B
Hyperfine interactions in open-shell planar sp2-carbon nanostructures
Sanghita Sengupta, Thomas Frederiksen, and Géza Giedke
Phys. Rev. B 107, 224433 (2023); also available
at arXiv:2303.11422.
June 19 - July 7, 2023 - Quantum
Information Workshop, Benasque
(slides of the Future of
Quantum Information session)
June 15, 2023 - Research paper published in Journal of Physics: Condensed Matter
Mach-Zehnder-like interferometry with graphene nanoribbon networks
Sofia Sanz, Nick Papior, Géza Giedke, Daniel Sánchez-Portal, Mads Brandbyge and Thomas Frederiksen
J. Phys.: Cond. Mat. 35, 374001 (2023); also available at arXiv:2302.04821.
March 27, 2023 - Research paper published in Physical Review B
Magnetic frustration and fractionalization in oligo(indenoindenes)
R. Ortiz, G. Giedke, and T. Frederiksen
Phys. Rev. B 107, L100416 (2023); also available at arXiv:2211.07385.
October 7, 2022
- DIPC -
UPV/EHU (Donostia - Bilbao) Quantum Workshop 2022 at DIPC
August 30 - September 2, 2022 - Summerschool Nanotechnology meets Quantum Information 2022 (NanoQI'22) held in San Sebastián
August 2022 - Research visit by Alejandro
González-Tudela
(Instituto de Física Fundamental (IFF), CSIC, Madrid) (topological photonics)
July 15th, 2022 - Research paper published in Physical Review Research
Long-range electron-electron interactions in quantum dot systems and applications in quantum chemistry
J. Knörzer, C. J. van Diepen, T.-K. Hsiao, G. Giedke, U. Mukhopadhyay, C. Reichl, W. Wegscheider, J. I. Cirac, and L. M. K. Vandersypen
Phys. Rev. Research 4, 033043 (2022); also available at arXiv:2202.06756.
July 11th, 2022 - Research paper published in Physical Review Letters
A spin-polarizing electron beam splitter from crossed graphene nanoribbons
S. Sanz, N. Papior, G. Giedke, D. Sánchez-Portal, M. Brandbyge and T. Frederiksen
Phys. Rev. Lett. 129, 037701 (2022); also available at arXiv:2201.07147.
July 6th, 2022 - Research paper published in Physical Review Applied
Entangling nuclear spins in distant quantum dots via an electron bus
M. Bello, M. Benito, M. J. A. Schuetz, G. Platero and G. Giedke
Phys. Rev. Applied 18, 014009 (2022); also available at arXiv:2012.09507.
June 10th, 2022 - Research paper published in Journal of Physics: Condensed Matter
Energy density as a probe of band representations in photonic crystals
M. Blanco de Paz, M. A. J. Herrera, P. Arroyo Huidobro, H. Alaeian, M. G. Vergniory, B. Bradlyn, G. Giedke, A. García-Etxarri and D. Bercioux
J. Phys.: Cond. Mat. 34, 314002 (2022); also available at arXiv:2203.10908.
July 19th, 2021 - Research visit by Matthias Englbrecht
(Universität Innsbruck) [until October; joint work with Barabara
Kraus on the characterization of quantum light sources]
Feb 11th, 2021 - Research paper published in Quantum Science and Technology
Frequency-resolved photon correlations in cavity optomechanics
M.K. Schmidt, R. Esteban, G. Giedke, J. Aizpurua, and
A. Gonzalez-Tudela
Quant. Sci. Tech. , (2021); also available at arXiv:2009.06216.
Jan 11th, 2021 - Research paper published in
Phys. Rev. A
Limit Cycle Phase and Goldstone Mode in Driven Dissipative Systems
H. Alaeian, G. Giedke, I. Carusotto, R. Löw, and T. Pfau
Phys. Rev. A 103, 013712 (2021); also available
at arXiv:2007.10680.
Dec 15th, 2020 - Research paper published in New
Journal of Physics
Symmetry-protection of multiphoton states of light
J. Lasa-Alonso; M. Molezuelas; J. J. M. Varga; A. García-Etxarri; G. Giedke & G. Molina-Terriza
New J. Phys. 22, 123010 (2020); also available
at arXiv:2007.06942.
Oct 13-16th, 2020 Workshop Quantum Thermodynamics of Non-equilibrium Systems
Jul 24th, 2020 - Research paper published in Phys Rev B
Crossed graphene nanoribbons as beam splitters and mirrors for electron quantum optics
S. Sanz, P. Brandimarte; G. Giedke; D. Sánchez-Portal & T. Frederiksen
Phys. Rev. B 102, 035436 (2020); also available
at arXiv:2005.11391.
Jul 20-24th, 2020 visit at MPQ Garching
May 18th, 2020 - Research paper published in Phys Rev A
Teleporting Quantum Information Encoded in Fermionic
Modes
T. Debarba, F. Iemini, G. Giedke, and N. Friis
Phys. Rev. A 101, 052326 (2020); also available
at arXiv:2002.08201.
Mar 3rd, 2020 - Research paper published in Phys Rev B
Wigner crystals in two-dimensional transition-metal dichalcogenides: Spin physics and readout
J. Knörzer, M. J. A. Schuetz, G. Giedke, D. S. Wild, K. De Greve, R. Schmidt, M. D. Lukin, and J. I. Cirac
Phys. Rev. B 101, 125101 (2020); also available
at arXiv:1912.11089.
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.
September 10th, 2015 - Research paper published in Physical Review X
Universal Quantum Transducers Based on Surface
Acoustic Waves, Phys. Rev. X 5 031031 (2015)
by M.J.A. Schuetz, E.M. Kessler, G. Giedke, L.M.K. Vandersypen, M.D. Lukin, and J.I. Cirac
We propose a universal, on-chip quantum transducer based on surface acoustic waves in piezoactive materials. Because of the intrinsic piezoelectric (and/or magnetostrictive) properties of the material, our approach provides a universal platform capable of coherently linking a broad array of qubits, including quantum dots, trapped ions, nitrogen-vacancy centers, or superconducting qubits. The quantized modes of surface acoustic waves lie in the gigahertz range and can be strongly confined close to the surface in phononic cavities and guided in acoustic waveguides. We show that this type of surface acoustic excitation can be utilized efficiently as a quantum bus, serving as an on-chip, mechanical cavity-QED equivalent of microwave photons and enabling long-range coupling of a wide range of qubits.
See also
this highlight in Physics.
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