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arxiv: 1906.11146 · v2 · pith:5JLV7JINnew · submitted 2019-06-26 · 🪐 quant-ph · cond-mat.supr-con

3D integration and packaging for solid-state qubits

D. Rosenberg , S. Weber , D. Conway , D. Yost , J. Mallek , G. Calusine , R. Das , D. Kim
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M. Schwartz W. Woods J. L. Yoder W. D. Oliver
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Pith reviewed 2026-05-25 15:26 UTC · model grok-4.3

classification 🪐 quant-ph cond-mat.supr-con
keywords 3D integrationpackagingsolid-state qubitscryogenic environmentquantum processinginterconnectsthermal management
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The pith

3D integration plays a key role in packaging solid-state qubits for cryogenic operation.

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

The paper examines the challenge of creating packaging schemes that satisfy all requirements for solid-state qubits to function in cryogenic environments. It positions 3D integration as central to solving interconnect, thermal, and isolation needs. A sympathetic reader would see this as important because the authors present packaging as a major barrier to building larger quantum processors. The review covers work from the authors' group and the wider community on these methods.

Core claim

Developing a packaging scheme that meets all of the requirements for operation of solid-state qubits in a cryogenic environment can be a formidable challenge, and 3D integration plays a key role in addressing it.

What carries the argument

3D integration and packaging schemes that supply electrical, thermal, and mechanical connections while preserving cryogenic performance.

If this is right

  • 3D integration supports higher qubit densities without loss of performance.
  • Packaging must simultaneously solve signal integrity, heat management, and mechanical stability.
  • Hybrid integration approaches are emerging as a community focus.

Where Pith is reading between the lines

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

  • If 3D methods succeed they could accelerate multi-qubit demonstrations.
  • The same techniques may transfer to other cryogenic quantum platforms.
  • Tests in complete quantum circuits would provide direct evidence of utility.

Load-bearing premise

The primary barriers to scaling solid-state qubit systems are packaging and integration challenges rather than other factors such as qubit coherence or control electronics.

What would settle it

A demonstration of a scalable solid-state qubit processor that achieves stable cryogenic operation using only conventional 2D packaging would undermine the central claim.

Figures

Figures reproduced from arXiv: 1906.11146 by D. Conway, D. Kim, D. Rosenberg, D. Yost, G. Calusine, J. L. Yoder, J. Mallek, M. Schwartz, R. Das, S. Weber, W. D. Oliver, W. Woods.

Figure 1
Figure 1. Figure 1: FIG. 1. Images of air bridges fabricated at MIT Lincoln Laboratory. In (a), the air bridges are [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Comparison of single-chip and flip-chip versions of a superconducting flux qubit. a) Single [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Envisioned three-tier stack for control and readout of a 3D integrated quantum processor. [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Example of a shielded microwave TSV transition designed to minimize reflections. The [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Concept for a multilayer microwave circuit, reprinted from [26]. Wafers are micromachined [PITH_FULL_IMAGE:figures/full_fig_p011_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Interconnect platform developed for controlling and reading out solid-state qubits. The [PITH_FULL_IMAGE:figures/full_fig_p013_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Schematic of the three-tier stack shown in Figure 3 attached via flip chip to a microwave [PITH_FULL_IMAGE:figures/full_fig_p013_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Dilution fridge wiring for superconducting qubit experiments. (a) Photograph of a dilution [PITH_FULL_IMAGE:figures/full_fig_p015_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Single flux quantum (SFQ) circuit coupled to qubit, reprinted from [50]. The SFQ driver [PITH_FULL_IMAGE:figures/full_fig_p017_9.png] view at source ↗
read the original abstract

Developing a packaging scheme that meets all of the requirements for operation of solid-state qubits in a cryogenic environment can be a formidable challenge. In this article, we discuss work being done in our group as well as in the broader community, focusing on the role of 3D integration and packaging in quantum processing with solid-state qubits.

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

0 major / 0 minor

Summary. The manuscript is a review article that discusses the challenges of developing packaging schemes for solid-state qubits in cryogenic environments. It highlights the role of 3D integration in addressing these challenges and summarizes relevant work from the authors' group as well as the broader community.

Significance. As a review, the paper provides a synthesis of approaches to 3D integration and packaging for quantum processors. This could be useful for researchers in the field by consolidating information on cryogenic hardware strategies. The central framing—that packaging presents a formidable challenge and 3D integration is relevant—is a reasonable observation for a review and does not depend on untested assumptions about primary scaling barriers; the stress-test concern regarding other factors like coherence does not apply here as the paper advances no comparative claims.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive review and recommendation to accept the manuscript. The feedback confirms that the review provides a useful synthesis of cryogenic hardware strategies for solid-state qubits.

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper is a review and discussion article summarizing existing work on 3D integration for cryogenic qubit packaging. It advances no derivations, equations, fitted parameters, predictions, or falsifiable claims that could reduce to self-definitions or self-citations. The central statement is a framing observation about packaging challenges rather than a load-bearing derivation chain.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As a review paper, it introduces no free parameters, axioms, or invented entities. The central discussion rests on the general premise that cryogenic packaging is challenging, which is treated as background knowledge.

pith-pipeline@v0.9.0 · 5614 in / 944 out tokens · 18259 ms · 2026-05-25T15:26:52.189364+00:00 · methodology

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Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

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matches
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supports
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extends
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contradicts
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unclear
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Reference graph

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