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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A general framework for universal quantum state purification under energy-conservation constraints, including necessary and sufficient conditions for nonexistence and optimal protocols for depolarizing noise.
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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.
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Universal quantum state purification with energy-preserving operations
A general framework for universal quantum state purification under energy-conservation constraints, including necessary and sufficient conditions for nonexistence and optimal protocols for depolarizing noise.