10,896 research outputs found
Track clustering with a quantum annealer for primary vertex reconstruction at hadron colliders
Clustering of charged particle tracks along the beam axis is the first step
in reconstructing the positions of hadronic interactions, also known as primary
vertices, at hadron collider experiments. We use a 2036 qubit D-Wave quantum
annealer to perform track clustering in a limited capacity on artificial events
where the positions of primary vertices and tracks resemble those measured by
the Compact Muon Solenoid experiment at the Large Hadron Collider. The
algorithm, which is not a classical-quantum hybrid but relies entirely on
quantum annealing, is tested on a variety of event topologies from 2 primary
vertices and 10 tracks up to 5 primary vertices and 15 tracks. It is
benchmarked against simulated annealing executed on a commercial CPU
constrained to the same processor time per anneal as time in the physical
annealer, and performance is found to be comparable for small numbers of
vertices with an intriguing advantage noted for 2 vertices and 16 tracks
Adiabatic Quantum Algorithm for Multijet Clustering in High Energy Physics
The currently predicted increase in computational demand for the upcoming
High-Luminosity Large Hadron Collider (HL-LHC) event reconstruction, and in
particular jet clustering, is bound to challenge present day computing
resources, becoming an even more complex combinatorial problem. In this paper,
we show that quantum annealing can tackle dijet event clustering by introducing
a novel quantum annealing binary clustering algorithm. The benchmarked
efficiency is of the order of , thus yielding substantial improvements
over the current quantum state-of-the-art. Additionally, we also show how to
generalize the proposed objective function into a more versatile form, capable
of solving the clustering problem in multijet events
PtSi Clustering In Silicon Probed by Transport Spectroscopy
Metal silicides formed by means of thermal annealing processes are employed
as contact materials in microelectronics. Control of the structure of
silicide/silicon interfaces becomes a critical issue when the device
characteristic size is reduced below a few tens of nanometers. Here we report
on silicide clustering occurring within the channel of PtSi/Si/PtSi Schottky
barrier transistors. This phenomenon is investigated through atomistic
simulations and low-temperature resonant tunneling spectroscopy. Our results
provide evidence for the segregation of a PtSi cluster with a diameter of a few
nanometers from the silicide contact. The cluster acts as metallic quantum dot
giving rise to distinct signatures of quantum transport through its discrete
energy states
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