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pith:YG6SVXWS

pith:2026:YG6SVXWSZVBRLNMU2E35LHB7W4

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Variational quantum state preparation within an entangle-rotate circuit framework for quantum-enhanced metrology in noisy systems

Jeffrey Larson, Juan C. Zu\~niga Castro, Matt Menickelly, Michael A. Perlin, Robert J. Lewis-Swan, Sri Hari Krishna Narayanan, Yicheng Zhang

Optimizing repeated entangle-rotate layers in a variational circuit maximizes quantum Fisher information for metrology even when noise is present.

arxiv:2604.15209 v1 · 2026-04-16 · quant-ph

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Claims

C1strongest claim

We observe notable improvements in the QFI as the circuit layer depth increases, even for appreciable noise rates, demonstrating that our entangle-rotate architecture expands the accessible state space under realistic noise conditions.

C2weakest assumption

The numerical optimization of variational parameters converges to states that are sufficiently close to the global maximum of QFI for the chosen noise model and Hamiltonian.

C3one line summary

An entangle-rotate variational circuit improves QFI for quantum metrology in noisy systems, with gains persisting as circuit depth increases even at appreciable decoherence rates.

References

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[1] For example, we compute GHZ fidelities (F(n) GHZ) by setting|Ψ⟩=|GHZ,Φ⟩[see Eq

[2] In the text we use the CES to delineate the uncorre- lated regime at the decoherenceγ 2 where Θ(1) I = 0

[3] In the text, we present the scaled squeezing parameter (N ξ2 s)−1 where larger values correspond to states exhibit- ing squeezed-like character

[4] Bounded from above by the QFI, the CFI quantifies the extent to which readout restricted to collective observables may exploit a given state’s metro- logical potential

[5] 2 as a function of the scaled decoherence strength γ/χ

Receipt and verification

First computed	2026-05-28T02:04:47.696023Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c1bd2aded2cd4315b594d137d59c3fb728c6c2fb8e547df7d34a2010d0d2d8dc

Aliases

arxiv: 2604.15209 · arxiv_version: 2604.15209v1 · doi: 10.48550/arxiv.2604.15209 · pith_short_12: YG6SVXWSZVBR · pith_short_16: YG6SVXWSZVBRLNMU · pith_short_8: YG6SVXWS

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curl -sH 'Accept: application/ld+json' https://pith.science/pith/YG6SVXWSZVBRLNMU2E35LHB7W4 \
  | 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: c1bd2aded2cd4315b594d137d59c3fb728c6c2fb8e547df7d34a2010d0d2d8dc

Canonical record JSON

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    "abstract_canon_sha256": "b41dfb22d6cdefb6cd287b1fbfadc54c73ed28167d5b3b848267c683a3192d28",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-04-16T16:40:43Z",
    "title_canon_sha256": "a9402244be2b522d0c897c7b4159bb697b6dd4b08186e4fef77654add46b495e"
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