Any temperature-dependent unitary driving on a thermalized quantum probe universally boosts its quantum Fisher information for thermometry above the static equilibrium value via a positive kernel of information currents.
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For suitable spatial and temporal correlations in non-Markovian dephasing, entangled probes achieve superior sensitivity scaling with probe number compared to separable states in Ramsey spectroscopy.
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Shake before use: universal enhancement of quantum thermometry by unitary driving
Any temperature-dependent unitary driving on a thermalized quantum probe universally boosts its quantum Fisher information for thermometry above the static equilibrium value via a positive kernel of information currents.
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Entanglement Enhanced Sensing with Qubits affected by non-Markovian Dephasing
For suitable spatial and temporal correlations in non-Markovian dephasing, entangled probes achieve superior sensitivity scaling with probe number compared to separable states in Ramsey spectroscopy.