Related papers: Unraveling the role of disorderness in superconducting materials on qubit coherence

Unraveling the role of disorderness in superconducting materials on qubit coherence

URL: http://arxiv.org/abs/2310.06621v2
Date: Thu, 23 Nov 2023 03:21:26 GMT
Title: Unraveling the role of disorderness in superconducting materials on qubit coherence
Authors: Ran Gao, Feng Wu, Hantao Sun, Jianjun Chen, Hao Deng, Xizheng Ma, Xiaohe Miao, Zhijun Song, Xin Wan, Fei Wang, Tian Xia, Make Ying, Chao Zhang, Yaoyun Shi, Hui-Hai Zhao, Chunqing Deng
Abstract summary: We demonstrate the first and a systematic characterization of fluxonium qubits with the superinductors made from titanium-aluminum-nitride with varied disorderness. Results reveal that the $1/f$ flux noise dominates the qubit decoherence around the flux-frustration point, strongly correlated with the material disorderness.
Score: 29.656495634900356
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Introducing disorderness in the superconducting materials has been considered promising to enhance the electromagnetic impedance and realize noise-resilient superconducting qubits. Despite a number of pioneering implementations, the understanding of the correlation between the material disorderness and the qubit coherence is still developing. Here, we demonstrate the first and a systematic characterization of fluxonium qubits with the superinductors made from titanium-aluminum-nitride with varied disorderness. From qubit noise spectroscopy, the flux noise and the dielectric loss are extracted as a measure of the coherence properties. Our results reveal that the $1/f$ flux noise dominates the qubit decoherence around the flux-frustration point, strongly correlated with the material disorderness; while the dielectric loss remains low under a wide range of material properties. From the flux-noise amplitudes, the areal density ($\sigma$) of the phenomenological spin defects and material disorderness are found to be approximately correlated by $\sigma \propto \rho_{xx}^3$, or effectively $(k_F l)^{-3}$. This work has provided new insights on the origin of decoherence channels within superconductors, and could serve as a useful guideline for material design and optimization.

Related papers

Charge and Flux Noise from Nonequilibrium Quasiparticle Energy Distributions in Superconducting Wires [0.0]
tunneling of excess quasiparticles across Josephson junctions is recognized as one of the main loss and decoherence mechanisms in superconducting qubits. Here we propose an additional loss mechanism arising from nonequilibrium quasiparticle densities: Ohmic loss due to quasiparticles residing in superconducting wires away from the junctions.
arXiv Detail & Related papers (2024-07-30T20:31:19Z)
Measuring kinetic inductance and superfluid stiffness of two-dimensional superconductors using high-quality transmission-line resonators [1.9343861862849647]
We demonstrate a new technique that employs high-quality-factor superconducting resonators to measure the kinetic inductance. We analyze the equivalent circuit model to extract the kinetic inductance, super stiffness, penetration depth, and ratio of imaginary and real parts of the complex conductivity. Our method will be useful for practitioners in the growing fields of superconducting physics, materials science, and quantum sensing.
arXiv Detail & Related papers (2024-07-13T15:26:00Z)
Superfluid stiffness of twisted multilayer graphene superconductors [1.374933941124824]
We report the measurement of $rho_s$ in magic-angle twisted trilayer graphene (TTG) We find a linear temperature dependence of $rho_s$ at low temperatures and nonlinear Meissner effects in the current bias dependence. Our results provide strong evidence for nodal superconductivity in TTG and put strong constraints on the mechanisms of these graphene-based superconductors.
arXiv Detail & Related papers (2024-06-19T18:00:04Z)
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)
Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems [52.77024349608834]
Superconducting circuits are a leading platform for quantum computing. Charge fluctuators inside amorphous oxide layers contribute to both low-frequency $1/f$ charge noise and high-frequency dielectric loss. We propose to mitigate those harmful effects by engineering the relevant TLS noise spectral densities.
arXiv Detail & Related papers (2022-06-21T18:37:38Z)
Microscopic Theory of Magnetic Disorder-Induced Decoherence in Superconducting Nb Films [0.0]
We develop an ab initio Shiba theory to investigate the microscopic origin of magnetic-induced decoherence in niobium thin film superconductors. Our ab initio calculations encompass the roles of structural disorder, stoichiometry, and strain on the formation of decoherence-inducing local spin moments.
arXiv Detail & Related papers (2021-11-23T07:08:20Z)
Ultrahigh-inductance materials from spinodal decomposition [30.5681951791708]
Disordered superconducting nitrides with kinetic inductance have long been considered a leading material candidate for high-inductance quantum-circuit applications. We propose a method to drastically increase the kinetic inductance of superconducting materials via spinodal decomposition while keeping a low microwave loss. For the first time demonstrate the utilization of spinodal decomposition to trigger the insulator-to-superconductor transition with a drastically enhanced material disorder.
arXiv Detail & Related papers (2021-11-09T12:42:09Z)
TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting Resonators [48.7576911714538]
Superconducting qubits have emerged as a potentially foundational platform technology. Material quality and interfacial structures continue to curb device performance. Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
arXiv Detail & Related papers (2021-08-30T22:22:47Z)
Measurement of the Low-temperature Loss Tangent of High-resistivity Silicon with a High Q-factor Superconducting Resonator [58.720142291102135]
We present the direct loss tangent measurement of a high-resist intrinsicivity (100) silicon wafer in the temperature range from 70 mK to 1 K. The measurement was performed using a technique that takes advantage of a high quality factor superconducting niobium resonator.
arXiv Detail & Related papers (2021-08-19T20:13:07Z)
Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits. We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
arXiv Detail & Related papers (2020-11-29T09:57:50Z)
Microscopic Relaxation Channels in Materials for Superconducting Qubits [76.84500123816078]
We show correlations between $T_$ and grain size, enhanced oxygen diffusion along grain boundaries, and concentration of suboxides near the surface. Physical mechanisms connect these microscopic properties to residual surface resistance and $T_$ through losses arising from the grain boundaries and from defects in the suboxides. This comprehensive approach to understanding qubit decoherence charts a pathway for materials-driven improvements of superconducting qubit performance.
arXiv Detail & Related papers (2020-04-06T18:01:15Z)

This list is automatically generated from the titles and abstracts of the papers in this site.