Pith Number

pith:KYDXZCUZ

pith:2026:KYDXZCUZMAVOK4BC5H3PRQ632E

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Using a spin-triplet encoding to enhance shuttling fidelities in Si/SiGe quantum wells

Mark Friesen, Merritt P. R. Losert, S. N. Coppersmith

Two-electron valley-singlet encoding makes shuttling fidelity improve with smaller valley splittings in Si/SiGe wells.

arxiv:2605.12687 v1 · 2026-05-12 · cond-mat.mes-hall

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\pithnumber{KYDXZCUZMAVOK4BC5H3PRQ632E}

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Record completeness

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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Claims

C1strongest claim

We propose an unconventional two-electron qubit encoding, based on valley-singlet states, that is largely immune to Landau-Zener leakage processes. In contrast to single-electron spins, the shuttling fidelity actually improves for small valley splittings.

C2weakest assumption

The model assumes that valley-singlet states can be prepared and maintained as stable qubits during shuttling without introducing new decoherence or control errors from two-electron interactions or gate operations.

C3one line summary

A spin-triplet encoding based on valley-singlet states makes shuttling fidelities in Si/SiGe quantum wells higher and more robust to small valley splittings by suppressing Landau-Zener excitations.

References

103 extracted · 103 resolved · 0 Pith anchors

[1] We see that average infidelities are well below10 −4 in all cases

[2] D. Loss and D. P. DiVincenzo, Quantum computation with quantum dots, Phys. Rev. A57, 120 (1998) 1998

[3] F. A. Zwanenburg, A. S. Dzurak, A. Morello, M. Y. Simmons, L. C. L. Hollenberg, G. Klimeck, S. Rogge, S. N. Copper- smith, and M. A. Eriksson, Silicon quantum electronics, Rev. Mod. Phys.85, 961 (2013 2013

[4] G. Burkard, T. D. Ladd, A. Pan, J. M. Nichol, and J. R. Petta, Semiconductor spin qubits, Rev. Mod. Phys.95, 025003 (2023) 2023

[5] J. Yoneda, K. Takeda, T. Otsuka, T. Nakajima, M. R. Delbecq, G. Allison, T. Honda, T. Kodera, S. Oda, Y. Hoshi, N. Usami, K. M. Itoh, and S. Tarucha, A quantum-dot spin qubit with coherence limited by 2018

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-18T03:09:49.907194Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

56077c8a99602ae57022e9f6f8c3dbd12f3fc5110d75ac69b2cebe2db31993a2

Aliases

arxiv: 2605.12687 · arxiv_version: 2605.12687v1 · doi: 10.48550/arxiv.2605.12687 · pith_short_12: KYDXZCUZMAVO · pith_short_16: KYDXZCUZMAVOK4BC · pith_short_8: KYDXZCUZ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/KYDXZCUZMAVOK4BC5H3PRQ632E \
  | 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: 56077c8a99602ae57022e9f6f8c3dbd12f3fc5110d75ac69b2cebe2db31993a2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f8eb242019472aafec2d4a021b678da0655430bae6c7a968d9f26c4fc7b0f909",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cond-mat.mes-hall",
    "submitted_at": "2026-05-12T19:35:29Z",
    "title_canon_sha256": "f71c4ca7775a7b14e397e3dc448535d2b87bc4e3463b99c040b11c5234d16f56"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.12687",
    "kind": "arxiv",
    "version": 1
  }
}