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arxiv: 2606.12262 · v1 · pith:WKBS44SMnew · submitted 2026-06-10 · ❄️ cond-mat.supr-con

Substrate insulated Josephson junctions for superconducting quantum circuits

U. Strobel (1) , L. Radtke (1) , L. Kamps (2) , J. N. Voss (1) , J. Lisenfeld (1) , J. Luo-Hofmann (2) , D. Reuter (2) , S. Masis (1)
show 9 more authors
A. V. Ustinov (1 3) H. Rotzinger (1 3)((1) Physikalisches Institut Karlsruher Institut f\"ur Technologie (2) Fraunhofer-Institut f\"ur Elektronische Nanosysteme Chemnitz (3) Institut f\"ur Quantenmaterialien und Technologie Karlsruher Institut f\"ur Technologie)
This is my paper

Pith reviewed 2026-06-27 07:57 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con
keywords Josephson junctionssuperconducting quantum circuitsfabrication techniquelow-loss substratedecoherencetrilayer junctionsNb/AlOx/Nb
0
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The pith

Josephson junctions fabricated using three-dimensional patterned low-loss substrates avoid organic resists and intentional oxides.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents a fabrication technique for Josephson junctions that replaces organic resists with a three-dimensional patterned low-loss substrate for insulation. This produces high-quality trilayer junctions from many materials and geometries, including high-melting-point superconductors such as tantalum and niobium. The electrodes contain no intentionally added oxides or organic materials. The authors fabricate and test underdamped Nb/AlOx/Nb junctions of varying sizes and shapes. The method is positioned to support quantum circuits that run at higher speeds and temperatures.

Core claim

We have developed a fabrication technique for Josephson junctions that employs a three-dimensional patterned, low-loss substrate instead of commonly used organic resists. The technique enables the fabrication of high-quality trilayer junctions from a wide range of geometries and materials, including high-melting-point superconductors such as tantalum or niobium. The junction electrodes are free from intentionally introduced oxides and organic materials, which are known sources of decoherence. We fabricate and characterize underdamped Nb/AlOx/Nb junctions of different sizes in several geometries. Such junctions enable manufacturing of quantum circuits operating at higher speeds and elevated t

What carries the argument

Three-dimensional patterned low-loss substrate that insulates the junction electrodes in place of organic resists.

If this is right

  • Junction electrodes can be made without organic materials or intentional oxides.
  • High-melting-point superconductors such as tantalum and niobium become usable for the electrodes.
  • Trilayer junctions become available in a wide range of sizes and geometries.
  • Quantum circuits can be built to operate at higher speeds and elevated temperatures.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The method may lower the density of two-level systems at the junction interfaces compared with resist-based processes.
  • Direct comparison of coherence times in circuits made with these junctions versus conventional ones would test the reduction in decoherence.
  • The substrate approach could be combined with other low-loss materials to further improve circuit performance.
  • Simplified resist-free processing might reduce contamination steps in large-scale superconducting device fabrication.

Load-bearing premise

The three-dimensional patterned low-loss substrate insulates the electrodes at least as well as organic resists while adding no new decoherence sources and yielding underdamped high-quality junctions.

What would settle it

Fabricated Nb/AlOx/Nb junctions that exhibit large leakage currents, fail to show underdamped current-voltage characteristics, or display decoherence rates comparable to or worse than standard resist-based junctions would falsify the central claim.

Figures

Figures reproduced from arXiv: 2606.12262 by (2) Fraunhofer-Institut f\"ur Elektronische Nanosysteme, 3), 3)((1) Physikalisches Institut, (3) Institut f\"ur Quantenmaterialien und Technologie, A. V. Ustinov (1, Chemnitz, D. Reuter (2), H. Rotzinger (1, J. Lisenfeld (1), J. Luo-Hofmann (2), J. N. Voss (1), Karlsruher Institut f\"ur Technologie, Karlsruher Institut f\"ur Technologie), L. Kamps (2), L. Radtke (1), S. Masis (1), U. Strobel (1).

Figure 1
Figure 1. Figure 1: FIG. 1. Step edge insulated tunnel junction. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. False-color SEM image of a two-layer niobium CPW [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. (a) Roman numerals I–III indicate different wafers, [PITH_FULL_IMAGE:figures/full_fig_p005_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. (a) Roman numerals I–III indicate different wafers, [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
read the original abstract

We have developed a fabrication technique for Josephson junctions that employs a three-dimensional patterned, low-loss substrate instead of commonly used organic resists. The technique enables the fabrication of high-quality trilayer junctions from a wide range of geometries and materials, including high-melting-point superconductors such as tantalum or niobium. The junction electrodes are free from intentionally introduced oxides and organic materials, which are known sources of decoherence. We fabricate and characterize underdamped Nb/AlOx/Nb junctions of different sizes in several geometries. Such junctions enable manufacturing of quantum circuits operating at higher speeds and elevated temperatures.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript presents a fabrication technique for Josephson junctions that replaces organic resists with a three-dimensional patterned low-loss substrate. This enables Nb/AlOx/Nb trilayer junctions whose electrodes contain no intentionally introduced oxides or organics. The authors report fabricating and characterizing underdamped junctions across multiple sizes and geometries, with the implication that the approach supports quantum circuits at higher speeds and temperatures.

Significance. If the substrate insulation matches or exceeds resist performance without introducing new decoherence channels and the junctions prove high-quality, the method would expand material choices (including high-melting-point superconductors) and reduce known loss sources. The experimental demonstration of the process itself is a concrete advance in fabrication flexibility.

major comments (2)
  1. [§4] §4 (Characterization): The I-V curves confirm underdamped behavior for several geometries, but no quantitative metrics (e.g., subgap resistance ratio, quality factor, or yield statistics across devices) are reported, nor is there a side-by-side comparison to conventional resist-based junctions. This leaves the central claim that the substrate provides equivalent or superior insulation without new loss sources unsupported by the presented data.
  2. [§3] §3 (Fabrication process): The description states that electrodes are free from intentional oxides and organics, yet no post-fabrication surface analysis (XPS, AFM, or equivalent) is shown to verify the absence of these contaminants at the levels relevant to decoherence. Without such verification, the advantage over standard processes remains unquantified.
minor comments (2)
  1. [Figures] Figure captions should explicitly state the number of devices measured and the temperature at which I-V data were taken.
  2. [Abstract and §1] The abstract claims 'high-quality' junctions; the main text should define this term with reference to specific electrical parameters rather than leaving it qualitative.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive comments. We address each major comment below and indicate revisions where appropriate.

read point-by-point responses

  1. Referee: [§4] §4 (Characterization): The I-V curves confirm underdamped behavior for several geometries, but no quantitative metrics (e.g., subgap resistance ratio, quality factor, or yield statistics across devices) are reported, nor is there a side-by-side comparison to conventional resist-based junctions. This leaves the central claim that the substrate provides equivalent or superior insulation without new loss sources unsupported by the presented data.

    Authors: We agree that quantitative metrics would strengthen the presentation. In the revised manuscript we will extract and report the subgap resistance ratio and an estimate of the quality factor from the existing I-V curves. Yield statistics are not available because the study was a proof-of-concept demonstration on a limited set of devices. A direct experimental side-by-side comparison with resist-based junctions was outside the scope of this work; we will instead add a discussion of the expected reduction in loss channels due to the absence of intentional organics and oxides. revision: partial

  2. Referee: [§3] §3 (Fabrication process): The description states that electrodes are free from intentional oxides and organics, yet no post-fabrication surface analysis (XPS, AFM, or equivalent) is shown to verify the absence of these contaminants at the levels relevant to decoherence. Without such verification, the advantage over standard processes remains unquantified.

    Authors: The manuscript states that the process avoids intentional introduction of oxides and organics by replacing resist patterning with a 3D-patterned substrate. The electrical characterization of underdamped junctions provides supporting evidence that these known decoherence sources are not present at levels that prevent junction operation. We will revise the text to clarify this distinction between intentional avoidance and post-fabrication verification, but additional surface-analysis experiments lie beyond the scope of the present fabrication-focused study. revision: no

Circularity Check

0 steps flagged

No significant circularity: experimental fabrication paper

full rationale

This manuscript describes an experimental fabrication process for Josephson junctions using a 3D-patterned substrate and reports measured I-V characteristics of fabricated devices. No mathematical derivations, parameter fits, predictions from models, or uniqueness theorems are present. All load-bearing claims rest on direct fabrication steps and empirical data rather than any self-referential reduction or self-citation chain. The paper is therefore self-contained against external benchmarks with no circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

As an experimental methods paper, the central claim rests on the validity of the fabrication process and the assumption that substrate insulation provides equivalent or better insulation without introducing new loss channels.

axioms (2)
  • domain assumption Organic resists and intentional oxides introduce decoherence in Josephson junctions.
    Stated in abstract as known sources.
  • domain assumption The 3D patterned substrate is low-loss and suitable for defining junction geometry.
    Key to the technique's advantage over resists.

pith-pipeline@v0.9.1-grok · 5753 in / 1294 out tokens · 21770 ms · 2026-06-27T07:57:01.412176+00:00 · methodology

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