High-Energy Quasiparticle Injection into Mesoscopic Superconductors
Nature Nanotechnology, 2021 At nonzero temperatures, superconductors contain excitations known as Bogoliubov quasiparticles. The mesoscopic dynamics of quasiparticles inform the design of quantum information processors, among other devices.
Alegria, Loren D. +7 more
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Quasiparticle and optical properties of strained stanene and stanane
Scientific Reports, 2017 Quasiparticle band structures and optical properties of two dimensional stanene and stanane (fully hydrogenated stanene) are studied by the GW and GW plus Bethe–Salpeter equation (GW-BSE) approaches, with inclusion of the spin-orbit coupling (SOC).
Pengfei Lu +6 more
doaj +2 more sources
Quantum Many-Body Scars: A Quasiparticle Perspective [PDF]
Annual Review of Condensed Matter Physics, 2022 Weakly interacting quasiparticles play a central role in the low-energy description of many phases of quantum matter. At higher energies, however, quasiparticles cease to be well defined in generic many-body systems owing to a proliferation of decay ...
A. Chandran +3 more
semanticscholar +1 more source
A stress-induced source of phonon bursts and quasiparticle poisoning [PDF]
Nature Communications, 2022 The performance of superconducting qubits is degraded by a poorly characterized set of energy sources breaking the Cooper pairs responsible for superconductivity, creating a condition often called “quasiparticle poisoning”.
R. Anthony-Petersen +45 more
semanticscholar +1 more source
Quasiparticle Poisoning of Superconducting Qubits from Resonant Absorption of Pair-Breaking Photons. [PDF]
Physical Review Letters, 2022 The ideal superconductor provides a pristine environment for the delicate states of a quantum computer: because there is an energy gap to excitations, there are no spurious modes with which the qubits can interact, causing irreversible decay of the ...
Chuan-Hong Liu +10 more
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Environmental radiation impact on lifetimes and quasiparticle tunneling rates of fixed-frequency transmon qubits [PDF]
Applied Physics Letters, 2021 Quantum computing relies on the operation of qubits in an environment as free of noise as possible. This work reports on measuring the impact of environmental radiation on lifetimes of fixed frequency transmon qubits with various capacitor pad geometries
R. Gordon +14 more
semanticscholar +1 more source
Using materials for quasiparticle engineering [PDF]
Materials for Quantum Technology, 2021 The fundamental excitations in superconductors – Bogoliubov quasiparticles – can be either a resource or a liability in superconducting devices: they are what enables photon detection in microwave kinetic inductance detectors, but they are a source of ...
G. Catelani, J. Pekola
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Quasiparticle tunneling as a probe of Josephson junction barrier and capacitor material in superconducting qubits [PDF]
npj Quantum Information, 2021 Non-equilibrium quasiparticles are possible sources for decoherence in superconducting qubits because they can lead to energy decay or dephasing upon tunneling across Josephson junctions (JJs).
C. Kurter +17 more
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Observation of Quasiparticle Pair Production and Quantum Entanglement in Atomic Quantum Gases Quenched to an Attractive Interaction. [PDF]
Physical Review Letters, 2021 We report observations of quasiparticle pair production by a modulational instability in an atomic superfluid and present a measurement technique that enables direct characterization of quasiparticle quantum entanglement.
Cheng-An Chen +2 more
semanticscholar +1 more source
Hartree theory calculations of quasiparticle properties in twisted bilayer graphene [PDF]
Electronic Structure, 2020 A detailed understanding of interacting electrons in twisted bilayer graphene (tBLG) near the magic angle is required to gain insights into the physical origin of the observed broken symmetry phases.
Z. Goodwin +4 more
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