Variational optimization of shallow probes and decoders for structured phase estimation in small qubit arrays approaches entanglement-enhanced precision bounds for both uniform and weighted encodings.
All qubits share the same weight, αi = 1/N
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Variational Probe and Measurement Optimization for Structured Phase Estimation
Variational optimization of shallow probes and decoders for structured phase estimation in small qubit arrays approaches entanglement-enhanced precision bounds for both uniform and weighted encodings.