33 research outputs found
Dispersive cavity-mediated quantum gate between driven dot-donor nuclear spins
Nuclear spins show exceptionally long coherence times but the underlying good
isolation from their environment is a challenge when it comes to controlling
nuclear spin qubits. A particular difficulty, not only for nuclear spin qubits,
is the realization of two-qubit gates between distant qubits. Recently, strong
coupling between an electron spin and microwave resonator photons as well as a
microwave resonator mediated coupling between two electron spins both in the
resonant and the dispersive regime have been reported and, thus, a microwave
resonator mediated electron spin two qubit gate seems to be in reach. Inspired
by these findings, we theoretically investigate the interaction of a microwave
resonator with a hybrid quantum dot-donor (QDD) system consisting of a gate
defined Si QD and a laterally displaced P phosphorous donor atom
implanted in the Si host material. We find that driving the QDD system allows
to compensate the frequency mismatch between the donor nuclear spin splitting
in the MHz regime and typical superconducting resonator frequencies in the GHz
regime, and also enables an effective nuclear spin-photon coupling. While we
expect this coupling to be weak, we predict that coupling the nuclear spins of
two distant QDD systems dispersively to the microwave resonator allows the
implementation of a resonator mediated nuclear spin two-qubit
gate with a gate fidelity approaching .Comment: 27 pages, 13 figure
Numerical Investigation of Strongly Interacting Bosons at Zero Temperature
We review some numerical works carried out within the department for Quantum
Optics and Statistics at the University of Freiburg’s Institute of Physics, between
September 2016 and June 2018. Our activities focus on quantum properties of
matter at zero temperature, i.e., a regime where the thermal energy kBT is negligible
with respect to the other energy scales of the considered system. This
area of research, related to ultracold gases, has attracted a great deal of interest,
both experimentally and theoretically, since the first realization of a Bose-Einstein
condensate in 1995. In a context where the theoretical understanding of these
systems still remains challenging, the growing power of computers offers a unique
and efficient way to tackle such challenges. In our theory group, we particularly
use powerful numerical methods that give exact results, in contrast to other theoretical
approaches based on an a priori assumption, e.g., mean field theory. To
illustrate it, we focus on few typical results that would not be available other
than by using high performance computing. These results have been obtained by
using three numerical methods: quantum Monte Carlo (QMC), Gutzwiller Monte
Carlo (GMC), and the Multiconfigurational Time-dependent Hartree method for
bosons (MCTDHX)
Taxonomy of the order Bunyavirales : second update 2018
In October 2018, the order Bunyavirales was amended by inclusion of the family Arenaviridae, abolishment of three families, creation of three new families, 19 new genera, and 14 new species, and renaming of three genera and 22 species. This article presents the updated taxonomy of the order Bunyavirales as now accepted by the International Committee on Taxonomy of Viruses (ICTV).Non peer reviewe
BLOOM: A 176B-Parameter Open-Access Multilingual Language Model
Large language models (LLMs) have been shown to be able to perform new tasks
based on a few demonstrations or natural language instructions. While these
capabilities have led to widespread adoption, most LLMs are developed by
resource-rich organizations and are frequently kept from the public. As a step
towards democratizing this powerful technology, we present BLOOM, a
176B-parameter open-access language model designed and built thanks to a
collaboration of hundreds of researchers. BLOOM is a decoder-only Transformer
language model that was trained on the ROOTS corpus, a dataset comprising
hundreds of sources in 46 natural and 13 programming languages (59 in total).
We find that BLOOM achieves competitive performance on a wide variety of
benchmarks, with stronger results after undergoing multitask prompted
finetuning. To facilitate future research and applications using LLMs, we
publicly release our models and code under the Responsible AI License
2021 Taxonomic update of phylum Negarnaviricota (Riboviria: Orthornavirae), including the large orders Bunyavirales and Mononegavirales.
Correction to: 2021 Taxonomic update of phylum Negarnaviricota (Riboviria: Orthornavirae), including the large orders Bunyavirales and Mononegavirales. Archives of Virology (2021) 166:3567–3579. https://doi.org/10.1007/s00705-021-05266-wIn March 2021, following the annual International Committee on Taxonomy of Viruses (ICTV) ratification vote on newly proposed taxa, the phylum Negarnaviricota was amended and emended. The phylum was expanded by four families (Aliusviridae, Crepuscuviridae, Myriaviridae, and Natareviridae), three subfamilies (Alpharhabdovirinae, Betarhabdovirinae, and Gammarhabdovirinae), 42 genera, and 200 species. Thirty-nine species were renamed and/or moved and seven species were abolished. This article presents the updated taxonomy of Negarnaviricota as now accepted by the ICTV.This work was supported in part through Laulima Government Solutions, LLC prime contract with the US National Institute of Allergy and Infectious Diseases (NIAID) under Contract No. HHSN272201800013C. J.H.K. performed this work as an employee of Tunnell Government Services (TGS), a subcontractor of Laulima Government Solutions, LLC under Contract No. HHSN272201800013C. This work was also supported in part with federal funds from the National Cancer Institute (NCI), National Institutes of Health (NIH), under Contract No. 75N91019D00024, Task Order No. 75N91019F00130 to I.C., who was supported by the Clinical Monitoring Research Program Directorate, Frederick National Lab for Cancer Research. This work was also funded in part by Contract No. HSHQDC-15-C-00064 awarded by DHS S&T for the management and operation of The National Biodefense Analysis and Countermeasures Center, a federally funded research and development center operated by the Battelle National Biodefense Institute (V.W.); and NIH contract HHSN272201000040I/HHSN27200004/D04 and grant R24AI120942 (N.V., R.B.T.). S.S. acknowledges partial support from the Special Research Initiative of Mississippi Agricultural and Forestry Experiment Station (MAFES), Mississippi State University, and the National Institute of Food and Agriculture, US Department of Agriculture, Hatch Project 1021494. Part of this work was supported by the Francis Crick Institute which receives its core funding from Cancer Research UK (FC001030), the UK Medical Research Council (FC001030), and the Wellcome Trust (FC001030).S
2020 taxonomic update for phylum Negarnaviricota (Riboviria: Orthornavirae), including the large orders Bunyavirales and Mononegavirales.
In March 2020, following the annual International Committee on Taxonomy of Viruses (ICTV) ratification vote on newly proposed taxa, the phylum Negarnaviricota was amended and emended. At the genus rank, 20 new genera were added, two were deleted, one was moved, and three were renamed. At the species rank, 160 species were added, four were deleted, ten were moved and renamed, and 30 species were renamed. This article presents the updated taxonomy of Negarnaviricota as now accepted by the ICTV
2021 Taxonomic update of phylum Negarnaviricota (Riboviria: Orthornavirae), including the large orders Bunyavirales and Mononegavirales.
In March 2021, following the annual International Committee on Taxonomy of Viruses (ICTV) ratification vote on newly proposed taxa, the phylum Negarnaviricota was amended and emended. The phylum was expanded by four families (Aliusviridae, Crepuscuviridae, Myriaviridae, and Natareviridae), three subfamilies (Alpharhabdovirinae, Betarhabdovirinae, and Gammarhabdovirinae), 42 genera, and 200 species. Thirty-nine species were renamed and/or moved and seven species were abolished. This article presents the updated taxonomy of Negarnaviricota as now accepted by the ICTV