ORCID Profile
0000-0002-4053-722X
Current Organisations
ETH Zurich
,
Paul Scherrer Institute
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Photonics and Electro-Optical Engineering (excl. Communications) | Quantum Physics | Quantum Information, Computation and Communication
Expanding Knowledge in the Physical Sciences | Scientific Instruments | Expanding Knowledge in Engineering |
Publisher: American Physical Society (APS)
Date: 11-02-2011
Publisher: American Physical Society (APS)
Date: 20-08-2012
Publisher: American Physical Society (APS)
Date: 05-09-2013
Publisher: Springer Science and Business Media LLC
Date: 28-08-2023
Publisher: American Physical Society (APS)
Date: 02-05-2016
Publisher: American Physical Society (APS)
Date: 13-03-2014
Publisher: Springer Science and Business Media LLC
Date: 06-02-2018
DOI: 10.1038/S41534-017-0052-0
Abstract: Growth in the capabilities of quantum information hardware mandates access to techniques for performance verification that function under realistic laboratory conditions. Here we experimentally characterise the impact of common temporally correlated noise processes on both randomised benchmarking (RB) and gate-set tomography (GST). Our analysis highlights the role of sequence structure in enhancing or suppressing the sensitivity of quantum verification protocols to either slowly or rapidly varying noise, which we treat in the limiting cases of quasi-DC miscalibration and white noise power spectra. We perform experiments with a single trapped 171 Yb + ion-qubit and inject engineered noise $$\\left( { \\propto \\hat \\sigma _z} \\right)$$ ∝ σ ^ z to probe protocol performance. Experiments on RB validate predictions that measured fidelities over sequences are described by a gamma distribution varying between approximately Gaussian, and a broad, highly skewed distribution for rapidly and slowly varying noise, respectively. Similarly we find a strong gate set dependence of default experimental GST procedures in the presence of correlated errors, leading to significant deviations between estimated and calculated diamond distances in the presence of correlated $$\\hat \\sigma _z$$ σ ^ z errors. Numerical simulations demonstrate that expansion of the gate set to include negative rotations can suppress these discrepancies and increase reported diamond distances by orders of magnitude for the same error processes. Similar effects do not occur for correlated $$\\hat \\sigma _x$$ σ ^ x or $$\\hat \\sigma _y$$ σ ^ y errors or depolarising noise processes, highlighting the impact of the critical interplay of selected gate set and the gauge optimisation process on the meaning of the reported diamond norm in correlated noise environments.
Publisher: American Physical Society (APS)
Date: 11-02-2020
Publisher: American Physical Society (APS)
Date: 10-04-2018
Publisher: Springer Science and Business Media LLC
Date: 08-2022
Publisher: IOP Publishing
Date: 19-10-2018
Publisher: American Physical Society (APS)
Date: 30-07-2021
Publisher: American Physical Society (APS)
Date: 25-06-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1SC02142G
Abstract: Dynamics governing ultrafast chemical reactions can be efficiently simulated using analog quantum simulators composed of a coupled system of qudits and bosonic modes.
Publisher: AIP Publishing
Date: 04-2010
DOI: 10.1063/1.3386583
Abstract: We study a photoionization method to detect and image a narrow beam of cold atoms traveling along a high-gradient two-wire magnetic guide that is continuously on. Ions are accelerated in a compact acceleration region, directed through a drift region several centimeters in length, and detected using a position-sensitive ion detector. The potentials of several electrodes can be varied to adjust the imaging properties. Using ion trajectory simulations as well as experiments, we study the passage of the ions through the detection system, the magnification of the detection system, and the time-of-flight characteristics.
Publisher: American Physical Society (APS)
Date: 19-11-2013
Publisher: AIP
Date: 2008
DOI: 10.1063/1.2977837
Publisher: American Physical Society (APS)
Date: 21-08-2017
Publisher: Springer Science and Business Media LLC
Date: 07-07-2013
Publisher: American Physical Society (APS)
Date: 13-02-2020
Publisher: American Physical Society (APS)
Date: 19-07-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SC02453A
Abstract: Analog quantum computers can calculate molecular vibronic spectra using time-domain simulation, with exponentially greater scalability than previous, frequency-domain approaches. An accurate, trapped-ion simulation of SO 2 validates the approach.
Publisher: American Physical Society (APS)
Date: 08-02-2019
Publisher: American Physical Society (APS)
Date: 09-2015
Publisher: Springer Science and Business Media LLC
Date: 04-09-2017
DOI: 10.1038/NPHYS4244
Publisher: Springer Science and Business Media LLC
Date: 15-08-2022
Publisher: American Physical Society (APS)
Date: 13-12-2017
Publisher: American Physical Society (APS)
Date: 24-07-2018
Publisher: Springer Science and Business Media LLC
Date: 09-07-2014
DOI: 10.1038/NATURE13461
Abstract: The key to explaining and controlling a range of quantum phenomena is to study how information propagates around many-body systems. Quantum dynamics can be described by particle-like carriers of information that emerge in the collective behaviour of the underlying system, the so-called quasiparticles. These elementary excitations are predicted to distribute quantum information in a fashion determined by the system's interactions. Here we report quasiparticle dynamics observed in a quantum many-body system of trapped atomic ions. First, we observe the entanglement distributed by quasiparticles as they trace out light-cone-like wavefronts. Second, using the ability to tune the interaction range in our system, we observe information propagation in an experimental regime where the effective-light-cone picture does not apply. Our results will enable experimental studies of a range of quantum phenomena, including transport, thermalization, localization and entanglement growth, and represent a first step towards a new quantum-optic regime of engineered quasiparticles with tunable nonlinear interactions.
Location: Austria
Start Date: 04-2023
End Date: 04-2026
Amount: $451,265.00
Funder: Australian Research Council
View Funded Activity