Using materials for quasiparticle engineering

G Catelani, JP Pekola - Materials for Quantum Technology, 2022 - iopscience.iop.org
The fundamental excitations in superconductors—Bogoliubov quasiparticles—can be either
a resource or a liability in superconducting devices: they are what enables photon detection …

High-energy quasiparticle injection into mesoscopic superconductors

LD Alegria, CGL Bøttcher, AK Saydjari… - Nature …, 2021 - nature.com
At non-zero temperatures, superconductors contain excitations known as Bogoliubov
quasiparticles (QPs). The mesoscopic dynamics of QPs inform the design of quantum …

Phonon-mediated quasiparticle poisoning of superconducting microwave resonators

U Patel, IV Pechenezhskiy, BLT Plourde, MG Vavilov… - Physical Review B, 2017 - APS
Nonequilibrium quasiparticles represent a significant source of decoherence in
superconducting quantum circuits. Here we investigate the mechanism of quasiparticle …

Active quasiparticle suppression in a non-equilibrium superconductor

M Marín-Suárez, JT Peltonen, JP Pekola - Nano Letters, 2020 - ACS Publications
Quasiparticle (qp) poisoning is a major issue that impairs the operation of various
superconducting devices. Even though these devices are often operated at temperatures …

Demetra: Suppression of the relaxation induced by radioactivity in superconducting qubits

L Cardani, N Casali, G Catelani, T Charpentier… - Journal of Low …, 2020 - Springer
Non-equilibrium quasiparticles can deteriorate the performance of superconducting qubits
by reducing their coherence. We are investigating a source of quasiparticles that has been …

Coherent suppression of electromagnetic dissipation due to superconducting quasiparticles

IM Pop, K Geerlings, G Catelani, RJ Schoelkopf… - Nature, 2014 - nature.com
Owing to the low-loss propagation of electromagnetic signals in superconductors,
Josephson junctions constitute ideal building blocks for quantum memories, amplifiers …

[HTML][HTML] Engineering superconducting qubits to reduce quasiparticles and charge noise

X Pan, Y Zhou, H Yuan, L Nie, W Wei, L Zhang… - Nature …, 2022 - nature.com
Identifying, quantifying, and suppressing decoherence mechanisms in qubits are important
steps towards the goal of engineering a quantum computer or simulator. Superconducting …

A superconductor free of quasiparticles for seconds

ET Mannila, P Samuelsson, S Simbierowicz… - Nature Physics, 2022 - nature.com
Superconducting devices, based on the Cooper pairing of electrons, play an important role
in existing and emergent technologies, ranging from radiation detectors, to quantum …

[HTML][HTML] Quasiparticle poisoning in superconducting quantum computers

J Aumentado, G Catelani, K Serniak - Physics Today, 2023 - pubs.aip.org
One of the leading candidate platforms for a useful quan tum processor, however, is
constructed from components that don't evoke a picture of tiny, microscopic particles with …

Phonon traps reduce the quasiparticle density in superconducting circuits

F Henriques, F Valenti, T Charpentier, M Lagoin… - Applied physics …, 2019 - pubs.aip.org
Out of equilibrium quasiparticles (QPs) are one of the main sources of decoherence in
superconducting quantum circuits and one that is particularly detrimental in devices with …