Vortex Motion Induced Losses in Tantalum Resonators
- URL: http://arxiv.org/abs/2503.03168v1
- Date: Wed, 05 Mar 2025 04:22:48 GMT
- Title: Vortex Motion Induced Losses in Tantalum Resonators
- Authors: Faranak Bahrami, Matthew P. Bland, Nana Shumiya, Ray D. Chang, Elizabeth Hedrick, Russell A. McLellan, Kevin D. Crowley, Aveek Dutta, Logan Bishop-Van Horn, Yusuke Iguchi, Aswin Kumar Anbalagan, Guangming Cheng, Chen Yang, Nan Yao, Andrew L. Walter, Andi M. Barbour, Sarang Gopalakrishnan, Robert J. Cava, Andrew A. Houck, Nathalie P. de Leon,
- Abstract summary: Losses in Tantalum (Ta)-based resonators are dominated by two-level systems at low microwave powers and millikelvin temperatures.<n>We identify vortex motion-induced loss as the source of thermally activated microwave loss.
- Score: 3.19103292214898
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Tantalum (Ta) based superconducting circuits have been demonstrated to enable record qubit coherence times and quality factors, motivating a careful study of the microscopic origin of the remaining losses that limit their performance. We have recently shown that the losses in Ta-based resonators are dominated by two-level systems (TLSs) at low microwave powers and millikelvin temperatures. We also observe that some devices exhibit loss that is exponentially activated at a lower temperature inconsistent with the superconducting critical temperature (Tc) of the constituent film. Specifically, dc resistivity measurements show a Tc of over 4 K, while microwave measurements of resonators fabricated from these films show losses that increase exponentially with temperature with an activation energy as low as 0.3 K. Here, we present a comparative study of the structural and thermodynamic properties of Ta-based resonators and identify vortex motion-induced loss as the source of thermally activated microwave loss. Through careful magnetoresistance and x-ray diffraction measurements, we observe that the increased loss occurs for films that are in the clean limit, where the superconducting coherence length is shorter than the mean free path. Vortex motion-induced losses are suppressed for films in the dirty limit, which show evidence of structural defects that can pin vortices. We verify this hypothesis by explicitly pinning vortices via patterning and find that we can suppress the loss by microfabrication.
Related papers
- Direct Measurement of Microwave Loss in Nb Films for Superconducting Qubits [0.0]
Niobium films are a key component in modern two-dimensional superconducting qubits.
We show that microwave dissipation in the HiPIMS-prepared niobium films resembles of record-high intrinsic quality factor of bulk niobium SRF cavities.
arXiv Detail & Related papers (2024-07-11T20:43:45Z) - Dielectric Loss due to Charged-Defect Acoustic Phonon Emission [0.0]
Loss per defect depends mainly on properties of the host material.
Diamond, cubic BN, AlN, and SiC are optimal in this respect.
arXiv Detail & Related papers (2024-02-27T08:10:18Z) - Annealing reduces Si$_3$N$_4$ microwave-frequency dielectric loss in superconducting resonators [0.0]
Microwave-frequency devices rely on silicon nitride (Si$_3$N$_4$) for sensing, signal processing, and quantum communication.
We measure the cryogenic loss of either as-deposited or high-temperature stoichiometric Si$_3$N$_4$ as a function of drive strength and temperature.
arXiv Detail & Related papers (2023-12-21T00:44:46Z) - Precision measurement of the microwave dielectric loss of sapphire in
the quantum regime with parts-per-billion sensitivity [50.591267188664666]
Dielectric loss is known to limit state-of-the-art superconducting qubit lifetimes.
Recent experiments imply upper bounds on bulk dielectric loss tangents on the order of $100$ parts-per-billion.
We have devised a measurement method capable of separating and resolving bulk dielectric loss with a sensitivity at the level of $5$ parts per billion.
arXiv Detail & Related papers (2022-06-29T00:14:11Z) - Thermal self-oscillations in monolayer graphene coupled to a
superconducting microwave cavity [58.720142291102135]
We observe thermal self-oscillations in a monolayer graphene flake coupled to superconducting resonator.
The experimental observations fit well with theoretical model based on thermal instability.
The modelling of the oscillation sidebands provides a method to evaluate electron phonon coupling in disordered graphene sample at low energies.
arXiv Detail & Related papers (2022-05-27T15:38:41Z) - 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) - 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.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.