Pith Number

pith:6NOCGDCY

pith:2025:6NOCGDCYJWCZJZ5GDGTOJPFJQ2

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Nonequilibrium thermometry via an ensemble of initially correlated qubits

Enrico Trombetti, Marco Malitesta, Marco Pezzutto, Stefano Gherardini

Initial quantum correlations among qubits enhance the Quantum Fisher Information for bath temperature estimation during nonequilibrium thermalization.

arxiv:2507.03471 v2 · 2025-07-04 · quant-ph

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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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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

We find strong numerical evidence that, given same single-qubit reduced states, the inclusion of quantum correlations among the qubits of the ensemble always yields an enhanced QFI.

C2weakest assumption

The qubits remain weakly coupled to a macroscopic thermal bath so that the reduced dynamics is accurately described by a Markovian master equation with a temperature-dependent dissipator (abstract and implied in the protocol description).

C3one line summary

Initial quantum correlations among qubits enhance quantum Fisher information for temperature estimation in nonequilibrium Markovian thermalization, with early-time peaks and near-standard-quantum-limit performance for entangled states at high temperatures.

References

55 extracted · 55 resolved · 0 Pith anchors

[1] Time-evolution of a multi-qubit state The nonequilibrium thermometry setting, which we are referring to, considers a model where the interaction be- tween each qubit thermometer and the thermal bath i

[2] Quan- tum Reservoir Computing (QuReCo) 2020

[3] ˆK1 = 1 2 ∂β q 0 0 q(1 − p) , ∂β( ˆK †

[4] ˆK2 = 1 2 ∂β 0 0 0 pq , ∂β( ˆK †

[5] ˆK3 = 1 2 ∂β (1 − p)(1 − q) 0 0 −q , ∂β( ˆK †

Formal links

2 machine-checked theorem links

Cited by

1 paper in Pith

Surpassing thermal-state limit in thermometry via non-completely positive quantum encoding

Receipt and verification

First computed	2026-06-10T01:09:19.529514Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f35c230c584d8594e7a619a6e4bca986bed23cabeea2ab936fc3facbb9ef4c54

Aliases

arxiv: 2507.03471 · arxiv_version: 2507.03471v2 · doi: 10.48550/arxiv.2507.03471 · pith_short_12: 6NOCGDCYJWCZ · pith_short_16: 6NOCGDCYJWCZJZ5G · pith_short_8: 6NOCGDCY

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/6NOCGDCYJWCZJZ5GDGTOJPFJQ2 \
  | 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: f35c230c584d8594e7a619a6e4bca986bed23cabeea2ab936fc3facbb9ef4c54

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "64edecdb792a834efe52538af0179d41a7f6de5d95ec3aca0cb791cffb27d93a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2025-07-04T10:49:39Z",
    "title_canon_sha256": "a97bb4f3d8a41b85b814a9d1ab38107987f4aaac84b9f502a048e9b94d832488"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2507.03471",
    "kind": "arxiv",
    "version": 2
  }
}