Pith Number

pith:IA4PFCUK

pith:2026:IA4PFCUKRQKAUCJBXCDWUQJINB

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High-Coherence and High-frequency Quantum Computing: The Design of a High-Frequency, High-Coherence and Scalable Quantum Computing Architecture

Masroor H. S. Bukhari

A proposed 8-qubit transmon chip operates at 12 GHz using tantalum and niobium tri-layer junctions to reach 1.9 ms relaxation times and quality factors of 2.75 x 10^7.

arxiv:2601.21528 v2 · 2026-01-29 · quant-ph

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Claims

C1strongest claim

The architecture is designed to achieve average relaxation times of up to 1.9 ms with average quality factors of up to 2.75 x 10^7 at a central operating frequency of 12.0 GHz using tantalum and niobium/aluminum/aluminum oxide tri-layer structures.

C2weakest assumption

That the referenced advances in superconducting junction manufacturing using tantalum and Nb/Al/AlOx tri-layers on high-resistivity silicon will deliver the stated coherence times and quality factors when operated in the 11-13.5 GHz range without introducing additional high-frequency loss mechanisms.

C3one line summary

The paper proposes an 8-qubit transmon design at 12 GHz targeting 1.9 ms relaxation times and quality factors of 2.75e7 via tantalum and Nb/Al/AlOx fabrication on silicon.

References

56 extracted · 56 resolved · 2 Pith anchors

[1] they have shown that a surface treatment in the form of a fluorine -based application aided with argon -based ion milling helps remove the germanium and oxide re sidues, resulting in conspicuously imp

[2] The three important sub -sections of this section are the cryogenic readout and control, the room -temperature electronics and the interface with a digital co mputational and control system. The reado

[3] A. A. Houck et al. , Controlling the Spontaneous Emission of a Superconducting Transmon Qubit, Phys. Rev. Lett. 101, 080502 (2008) 2008

[4] J. Koch, M. Y. Terri, J. Gambetta, A. A. Houck, D. I. Schuster, J. Majer, A. B lais, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf, Charge -insensitive qubit design derived from the Cooper pair bo 2007

[5] R. Barends, J. Kelly, A. Megrant, D. Sank, E. Jeffrey, Y. Chen, Y. Yin, B. Chiaro, J. Mutus, C. Neill, et al. , Coherent Josephson qubit suitable for scalable quantum integrated circuits, Phys. Rev. L 2013

Formal links

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Receipt and verification

First computed	2026-05-18T02:44:31.771212Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4038f28a8a8c140a0921b8876a412868634cfbe24e35330d386d69afbf01e632

Aliases

arxiv: 2601.21528 · arxiv_version: 2601.21528v2 · doi: 10.48550/arxiv.2601.21528 · pith_short_12: IA4PFCUKRQKA · pith_short_16: IA4PFCUKRQKAUCJB · pith_short_8: IA4PFCUK

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/IA4PFCUKRQKAUCJBXCDWUQJINB \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 4038f28a8a8c140a0921b8876a412868634cfbe24e35330d386d69afbf01e632

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "260b1eece20c63421ce6554e57910f866c07296a5c21ee5a3e68687d7d37886b",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-01-29T10:43:43Z",
    "title_canon_sha256": "4115f4dfccba1cc6718b5a0daade0a2100129d41095ab6af48b88f340d19c55d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.21528",
    "kind": "arxiv",
    "version": 2
  }
}