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

• URL: http://arxiv.org/abs/2604.15209v1
• Date: Thu, 16 Apr 2026 16:40:43 GMT
• Title: Variational quantum state preparation within an entangle-rotate circuit framework for quantum-enhanced metrology in noisy systems
• Abstract summary: We investigate the generation of quantum states for precision metrology in noisy two-level systems.<n>Our circuit architecture, inspired by twist-and-turn schemes, features a sequence of $n$ entangling layers, each consisting of entangling gates followed by a global rotation.<n>We observe notable improvements in the QFI as the circuit layer depth increases, even for appreciable noise rates.
• Score: 3.24390413491232
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the generation of quantum states for precision metrology in noisy two-level systems. These states are obtained by optimizing a variational quantum circuit to maximize the quantum Fisher information (QFI) of the output state for a given decoherence rate and interaction Hamiltonian. The circuit architecture, inspired by twist-and-turn schemes, features a sequence of $n$ entangling layers, each consisting of entangling gates followed by a global rotation. 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. Our approach thus provides a general and efficient framework for generating quantum-enhanced sensing states. Our analysis extends to systems of power-law interactions spanning from all-to-all to nearest-neighbor interactions. We also analyze the capabilities of our circuit to prepare states for system sizes greater than $8$ qubits.

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