Two photonic models with antiunitary symmetry saturate the multi-parameter quantum Cramér-Rao bound; the mutually conjugate model halves the weighted mean squared error compared with the parallel-copy benchmark.
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Achieving the Multi-parameter Quantum Cram\'er-Rao Bound with Antiunitary Symmetry
Two photonic models with antiunitary symmetry saturate the multi-parameter quantum Cramér-Rao bound; the mutually conjugate model halves the weighted mean squared error compared with the parallel-copy benchmark.