A finite-frequency fluctuation-response inequality bounds the measured lock-in response-to-noise matrix by the output-field quantum Fisher information rate for Markovian open quantum systems.
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A new scalar for Uhlmann curvature is defined from the Yang-Mills action, proven gauge-invariant and reparametrization-invariant, and linked to incompatibility in quantum multiparameter estimation.
Ultimate precision bounds for multiparameter Markovian noise metrology show average variance scaling as Ω(1/(T R²)) with Heisenberg scaling in dissipative channels R when using entangled probes and high-rank signal correlations, attainable via rapid prepare-and-measure protocols.
Optimal null-constrained source encoding in TRY interferometers is achieved by noise-weighted projection of the derivative response, retaining Fisher information reduced exactly by the factor 1-χ² where χ is the inverse-noise overlap.
Differential source-basis encoding in a time-reversed Young interferometer enables superresolved local parameter estimation with robust gains over raster sampling and parameter-dependent interference improvements.
An information-geometric identity saturates to equality for single qubits, enabling non-iterative linear regression for GKSL master equation parameter estimation in quantum process tomography.
A proposed chip-scale device combines a transmon qubit, SQUID, and nanomechanical resonator to achieve projected gravitational sensitivity of 100-1000 nGal per square root Hz with sub-millisecond interrogation times.
Derives causal Fisher-information inequalities from classical causal models via a series law on inverse Fisher information, showing violations falsify the model class and certify quantum metrological advantage through forbidden score correlations.
Time-reversed Young interferometry yields deterministic fringes as conditional responses indexed by source coordinates, enabling precise calibration and superresolution via Fisher information analysis.
A quartic extension of the twisting-and-turning Hamiltonian generates new unstable fixed points that accelerate short-time amplification of quantum fluctuations, yielding enhanced sensitivity within accessible coherence times.
The work introduces hybrid receivers for BPSK coherent-state discrimination with quantum advantage and new discrete-modulation CVQKD protocols that incorporate optical amplifiers and state-discrimination receivers for performance gains.
Clock time is reconstructed from the accumulated Fisher distinguishability along causally ordered physical changes, rather than being a fundamental quantity measured by clocks.
citing papers explorer
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Finite-frequency fluctuation-response bounds for open quantum systems
A finite-frequency fluctuation-response inequality bounds the measured lock-in response-to-noise matrix by the output-field quantum Fisher information rate for Markovian open quantum systems.
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Quantifying Uhlmann curvature from Yang-Mills action and its implications in quantum multiparameter estimation
A new scalar for Uhlmann curvature is defined from the Yang-Mills action, proven gauge-invariant and reparametrization-invariant, and linked to incompatibility in quantum multiparameter estimation.
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Precision Limits of Multiparameter Markovian-Noise Metrology
Ultimate precision bounds for multiparameter Markovian noise metrology show average variance scaling as Ω(1/(T R²)) with Heisenberg scaling in dissipative channels R when using entangled probes and high-rank signal correlations, attainable via rapid prepare-and-measure protocols.
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Optimal Null-Constrained Source-Basis Sensing in a Time-Reversed Young Interferometer
Optimal null-constrained source encoding in TRY interferometers is achieved by noise-weighted projection of the derivative response, retaining Fisher information reduced exactly by the factor 1-χ² where χ is the inverse-noise overlap.
-
Differential source-basis encoding for superresolved parameter estimation in a time-reversed Young interferometer
Differential source-basis encoding in a time-reversed Young interferometer enables superresolved local parameter estimation with robust gains over raster sampling and parameter-dependent interference improvements.
-
Information-Geometric Quantum Process Tomography of Single Qubit Systems
An information-geometric identity saturates to equality for single qubits, enabling non-iterative linear regression for GKSL master equation parameter estimation in quantum process tomography.
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Chip-scale superconducting quantum gravimeter combining a SQUID, a transmon, and a nanomechanical resonator
A proposed chip-scale device combines a transmon qubit, SQUID, and nanomechanical resonator to achieve projected gravitational sensitivity of 100-1000 nGal per square root Hz with sub-millisecond interrogation times.
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Causal Fisher-Information Inequalities: Classical Causal Model Falsification and Metrological Advantage
Derives causal Fisher-information inequalities from classical causal models via a series law on inverse Fisher information, showing violations falsify the model class and certify quantum metrological advantage through forbidden score correlations.
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From Random Fringes to Deterministic Response: Statistical Foundations of Time-Reversed Young Interferometry
Time-reversed Young interferometry yields deterministic fringes as conditional responses indexed by source coordinates, enabling precise calibration and superresolution via Fisher information analysis.
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Instability-Enhanced Quantum Sensing with Tunable Multibody Interactions
A quartic extension of the twisting-and-turning Hamiltonian generates new unstable fixed points that accelerate short-time amplification of quantum fluctuations, yielding enhanced sensitivity within accessible coherence times.
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Quantum communications in continuous variable systems
The work introduces hybrid receivers for BPSK coherent-state discrimination with quantum advantage and new discrete-modulation CVQKD protocols that incorporate optical amplifiers and state-discrimination receivers for performance gains.
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Fisher-Informational Time: A Causal-Geometric Framework for Emergent Clock Time Physical Distinguishability
Clock time is reconstructed from the accumulated Fisher distinguishability along causally ordered physical changes, rather than being a fundamental quantity measured by clocks.