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.
For example, we compute GHZ fidelities (F(n) GHZ) by setting|Ψ⟩=|GHZ,Φ⟩[see Eq
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Variational quantum state preparation within an entangle-rotate circuit framework for quantum-enhanced metrology in noisy systems
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.