Two Doppler-free multiphoton schemes achieve microsecond coherent control of the 88Sr 1S0–3P0 clock transition on 3e6 free-space thermal atoms, suppressing Doppler dephasing 1000-fold versus single-photon excitation.
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CANP enhances quantum Fisher information by using noncommutativity between critical state preparation and parameter encoding, demonstrated in the quantum Rabi and Lipkin-Meshkov-Glick models at fixed resources.
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.
A theoretical framework expresses the electron-photon scattered state via the luminescence spectrum and uses subsystem purity plus an EPR-type criterion to distinguish wave-like, particle-like, and classical regimes of spatial entanglement in coherent cathodoluminescence.
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.
Simultaneous two-photon probing of a depolarizing medium makes polarization correlations quadratic in the Mueller matrix and degrades entanglement faster than single-photon polarimetry.
A new optimization-based protocol estimates quantum coherence from scarce data with system-size-independent cost and is experimentally demonstrated.
Two quantum Wasserstein distance definitions coincide for qubits with single-operator cost functions, implying the self-distance equals the Wigner-Yanase skew information.
High-order squeezed states can deliver better metrological precision than squeezed vacuum at equal occupations, with the advantage depending on the state family and sensitive to dephasing noise.
citing papers explorer
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Microsecond-Scale Coherent Control of a Forbidden Clock Transition with Doppler-Free Multiphoton Excitations
Two Doppler-free multiphoton schemes achieve microsecond coherent control of the 88Sr 1S0–3P0 clock transition on 3e6 free-space thermal atoms, suppressing Doppler dephasing 1000-fold versus single-photon excitation.
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Enhanced quantum metrology by criticality-assisted noncommutative preparation
CANP enhances quantum Fisher information by using noncommutativity between critical state preparation and parameter encoding, demonstrated in the quantum Rabi and Lipkin-Meshkov-Glick models at fixed resources.
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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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Electron-Photon Spatial Entanglement in Coherent Cathodoluminescence
A theoretical framework expresses the electron-photon scattered state via the luminescence spectrum and uses subsystem purity plus an EPR-type criterion to distinguish wave-like, particle-like, and classical regimes of spatial entanglement in coherent cathodoluminescence.
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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.
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Quadratic Quantum Polarimetry with Entangled Photon Pairs
Simultaneous two-photon probing of a depolarizing medium makes polarization correlations quadratic in the Mueller matrix and degrades entanglement faster than single-photon polarimetry.
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Scalable protocol to coherence estimation from scarce data: Theory and experiment
A new optimization-based protocol estimates quantum coherence from scarce data with system-size-independent cost and is experimentally demonstrated.
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Relations between different definitions of the quantum Wasserstein distance for qubits
Two quantum Wasserstein distance definitions coincide for qubits with single-operator cost functions, implying the self-distance equals the Wigner-Yanase skew information.
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Quantum metrological advantage of high-order squeezed states
High-order squeezed states can deliver better metrological precision than squeezed vacuum at equal occupations, with the advantage depending on the state family and sensitive to dephasing noise.