Zero-noise extrapolation has a finite-shot help-harm boundary below which it increases local mean-squared error due to variance penalties outweighing bias reduction.
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A swap test-based protocol complements quantum error correction for indistinguishable noise in quantum metrology and outperforms virtual state purification in simulations for single- and multi-parameter estimation.
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The finite-shot help-harm boundary of zero-noise extrapolation
Zero-noise extrapolation has a finite-shot help-harm boundary below which it increases local mean-squared error due to variance penalties outweighing bias reduction.
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Complementing Quantum Error Correction in Quantum Metrology via Swap Test
A swap test-based protocol complements quantum error correction for indistinguishable noise in quantum metrology and outperforms virtual state purification in simulations for single- and multi-parameter estimation.