Enhanced Quasiparticle Relaxation in a Superconductor via the Proximity Effect
- URL: http://arxiv.org/abs/2409.05233v1
- Date: Sun, 8 Sep 2024 22:12:20 GMT
- Title: Enhanced Quasiparticle Relaxation in a Superconductor via the Proximity Effect
- Authors: Kevin M. Ryan, Venkat Chandrasekhar,
- Abstract summary: We study the impact of a proximity layer on the transport of quasiparticles in a superconductor.
We find that a normal metal layer can be used to significantly increase the relaxation rate of quasiparticles in a superconductor.
- Score: 3.2635025659132166
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Quasiparticle relaxation in pure superconductors is thought to be determined by the intrinsic inelastic scattering rate in the material. In certain applications, i.e. superconducting qubits and circuits, excess quasiparticles exist at densities far beyond the thermal equilibrium level, potentially leading to dephasing and energy loss. In order to engineer superconductors with shorter overall quasiparticle lifetimes, we consider the impact of a proximity layer on the transport of quasiparticles in a superconductor. We find that a normal metal layer can be used to significantly increase the relaxation rate of quasiparticles in a superconductor, as seen by a large reduction in the quasiparticle charge imbalance in a fully proximitized Cu/Al bilayer wire. The mechanism for this effect may be useful for preventing quasiparticle poisoning of qubits using carefully chosen proximity bilayers consisting of clean superconductors and disordered normal metals.
Related papers
- Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids.
We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage.
Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
arXiv Detail & Related papers (2024-10-18T22:25:50Z) - The strongly driven Fermi polaron [49.81410781350196]
Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems.
We take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons.
We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states.
arXiv Detail & Related papers (2023-08-10T17:59:51Z) - Fragmented superconductivity in the Hubbard model as solitons in
Ginzburg-Landau theory [58.720142291102135]
Superconductivity and charge density waves are observed in close vicinity in strongly correlated materials.
We investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary $t$-$tprime$-$U$ Hubbard model.
We provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation.
arXiv Detail & Related papers (2023-07-21T18:00:07Z) - Mitigation of quasiparticle loss in superconducting qubits by phonon
scattering [2.959938599901649]
In superconducting qubits the assumption that errors are sufficiently uncorrelated in space and time is violated by ionizing radiation.
A potential mitigation technique is to place large volumes of normal or superconducting metal on the device, capable of reducing the phonon energy to below the superconducting gap of the qubits.
We investigate the effectiveness of this method in protecting superconducting qubit processors against correlated errors from ionizing radiation.
arXiv Detail & Related papers (2022-07-26T09:02:30Z) - Quasiparticle spectroscopy, transport, and magnetic properties of Nb
films used in superconducting transmon qubits [4.281703940559505]
Niobium thin films on silicon substrate used in the fabrication of superconducting qubits have been characterized.
The films show outstanding superconducting transition temperature of $T_c=9.35$ K and a fairly clean superconducting gap.
The response to the magnetic field is complicated, exhibiting significantly irreversible behavior and insufficient heat conductance.
arXiv Detail & Related papers (2022-07-23T22:45:23Z) - Superfluid drag between excitonic polaritons and superconducting
electron gas [0.0]
The Andreev-Bashkin effect, or superfluid drag, is predicted in a system of Bose-condensed excitonic polaritons in optical microcavity.
The predicted nondissipative drag could be strong enough to be observable as induction of a supercurrent in the electronic layer by a flow of polariton Bose condensate.
arXiv Detail & Related papers (2022-04-22T15:04:46Z) - Quasiparticle Poisoning of Superconducting Qubits from Resonant
Absorption of Pair-breaking Photons [0.0]
We show that a dominant mechanism for quasiparticle poisoning in superconducting qubits is direct absorption of high-energy photons at the qubit junction.
A deep understanding of this physics will pave the way to realization of next-generation superconducting qubits.
arXiv Detail & Related papers (2022-03-13T05:54:28Z) - Single quantum emitters with spin ground states based on Cl bound
excitons in ZnSe [55.41644538483948]
We show a new type of single photon emitter with potential electron spin qubit based on Cl impurities inSe.
Results suggest single Cl impurities are suitable as single photon source with potential photonic interface.
arXiv Detail & Related papers (2022-03-11T04:29:21Z) - Coherent superconducting qubits from a subtractive junction fabrication
process [48.7576911714538]
Josephson tunnel junctions are the centerpiece of almost any superconducting electronic circuit, including qubits.
In recent years, sub-micron scale overlap junctions have started to attract attention.
This work paves the way towards a more standardized process flow with advanced materials and growth processes, and constitutes an important step for large scale fabrication of superconducting quantum circuits.
arXiv Detail & Related papers (2020-06-30T14:52:14Z) - Impact of ionizing radiation on superconducting qubit coherence [43.13648171914508]
We show that environmental radioactive materials and cosmic rays contribute to an elevated quasiparticle density that would limit superconducting qubits of the type measured here to coherence times in the millisecond regime.
Introducing radiation shielding reduces the flux of ionizing radiation and positively correlates with increased coherence time.
arXiv Detail & Related papers (2020-01-24T20:59:46Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.