Pith Number

pith:6D6FPMPU

pith:2026:6D6FPMPUHMJFJCCOWGFLYMA7SD

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3D integration of a hybrid quantum dot circuit-QED device for fast gate dispersive charge readout and coherent spin-photon coupling

Alain Gueugnot, Benoit Bertrand, Chafik Mhamdi, Etienne Dumur, Frederic Berger, Frederic Gustavo, Heimanu Niebojewski, Jean-Luc Thomassin, Romain Maurand, Sebastien Granel, Simon Zihlmann

3D integration with indium bumps and NbN films produces hybrid quantum dot devices that reach 75 MHz spin-photon coupling and high cavity quality factors.

arxiv:2604.25871 v2 · 2026-04-28 · cond-mat.mes-hall

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Claims

C1strongest claim

we report a cavity internal quality factor above 10000 and demonstrate record sensitivity for gate-based dispersive readout of the charge degree of freedom with an SNR of 100 in 300 ns. Finally, we demonstrate strong spin-photon coupling of gs/{2π} = 75 MHz, which highlights the viability of 3D-integration for quantum dot based hybrid spin circuit quantum electrodynamics

C2weakest assumption

That the indium bump interconnects and 3D stacking process introduce negligible additional microwave losses, charge noise, or decoherence to the MOS quantum dots, preserving the reported high cavity Q and coupling strength.

C3one line summary

A 3D-integrated silicon MOS double quantum dot device with high-impedance NbN resonator achieves cavity Q above 10,000, dispersive charge readout SNR of 100 in 300 ns, and spin-photon coupling gs/2π = 75 MHz.

Receipt and verification

First computed	2026-07-16T00:21:47.803027Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f0fc57b1f43b1254884eb18abc301f90e8244fec83fc662a99994cccaa061bf4

Aliases

arxiv: 2604.25871 · arxiv_version: 2604.25871v2 · doi: 10.48550/arxiv.2604.25871 · pith_short_12: 6D6FPMPUHMJF · pith_short_16: 6D6FPMPUHMJFJCCO · pith_short_8: 6D6FPMPU

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/6D6FPMPUHMJFJCCOWGFLYMA7SD \
  | 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: f0fc57b1f43b1254884eb18abc301f90e8244fec83fc662a99994cccaa061bf4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "48e69a342ba6859ebc5cfd315881c710bcafffa5a101f20bcdd6e4d810cf225b",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cond-mat.mes-hall",
    "submitted_at": "2026-04-28T17:08:34Z",
    "title_canon_sha256": "9c6b5b2f8963c2e3cfb0861f4bb501ca312aaa5dda7ee6d361e1f33f7e13c51d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.25871",
    "kind": "arxiv",
    "version": 2
  }
}