Quantum Information -- Theory and Implementation
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
- Quantum information theory: entanglement, quantum channels
- Implementation of QIP in solid-state and quantum optical systems
- Dynamics of open quantum systems
Research highlights and news
Oct 24th, 2017
Traps and Lattices for Electrons in Semiconductors
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
Juanjo García-Ripoll (CSIC-IFF) has been approved by MINECO
Summerschool NanoQI'17 - The
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
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
M. Benito, M.J.A. Schuetz, J.I. Cirac, G. Platero, &
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,
Support the Quantum
Manifesto! calling upon Member States and the European Commission
to launch a EUR 1 billion Flagship-scale Initiative in Quantum
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.