New purification-based reformulations of QCRB and HCRB connect mixed-state metrology bounds to those of purified states, enabling asymptotic attainment of HCRB or 2×QCRB via random channels and individual measurements.
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OH molecule proposed as quantum probe for joint electric and magnetic field estimation, with optimized stationary and dynamical protocols that address incompatibility and show temperature effects on error.
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Quantum metrology of mixed states via purification
New purification-based reformulations of QCRB and HCRB connect mixed-state metrology bounds to those of purified states, enabling asymptotic attainment of HCRB or 2×QCRB via random channels and individual measurements.
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OH molecule as a quantum probe to jointly estimate electric and magnetic fields
OH molecule proposed as quantum probe for joint electric and magnetic field estimation, with optimized stationary and dynamical protocols that address incompatibility and show temperature effects on error.