A Fisher information framework for Rydberg EIT sensing of low-frequency fields proposes a DC-biased two-point differential method achieving ~10^{-4} V/m/sqrt(Hz) CRLB sensitivity, with cavity enhancement boosting Fisher information by over 100 times.
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Advances in quantum metrology
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A metasurface-based system generates entangled photons and extracts phase gradients to image up to 25 rad/mm with 89% similarity to reference measurements.
Fractional OAM charge ℓ=1.5 induces an optimal 67.5° GKP lattice rotation that reduces error rate 23.9× with <0.2% loss in Fisher information and yields 41% higher metrological capacity.
Engineered two-photon loss mitigates single-photon loss in TPD-Kerr systems by converting oscillatory decay to monotonic and extending metrological windows over an order of magnitude via non-Gaussian cat states.
In the Dicke model, multiparameter critical metrology achieves square-root divergent scaling for two parameters via higher-order QFIM contributions, while a Dicke dimer with triple point restores quadratic scaling for specific pairs.
A two-channel scheme with orthogonal modes in a dielectric cavity significantly improves dispersive readout sensitivity for NV-center magnetometers.
A time-bin multiplexing protocol generates parallel multipartite entanglement among N quantum nodes using a photon whose time-bin dimension stays independent of N.
Gradient-descent optimization of eight circuit parameters in a Strawberry Fields model yields CFI gains of 153% to 1775% and 8x to 133x more useful events per pulse versus Afek et al. (2010) for N=2-5, reaching 82% of Heisenberg limit at N=2 and 58% at N=5.
Electric charge of a Reissner-Nordström black hole enhances decoherence of Dirac entanglement inside the horizon but can temporarily boost accessible entanglement outside, while Hawking radiation transfers correlations to inaccessible regions causing apparent loss for external observers.
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Sensing of Low-Frequency Electric Fields Using Rydberg EIT within the Fisher Information Framework
A Fisher information framework for Rydberg EIT sensing of low-frequency fields proposes a DC-biased two-point differential method achieving ~10^{-4} V/m/sqrt(Hz) CRLB sensitivity, with cavity enhancement boosting Fisher information by over 100 times.
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Quantum Phase Gradient Imaging Using a Nonlocal Metasurface System
A metasurface-based system generates entangled photons and extracts phase gradients to image up to 25 rad/mm with 89% similarity to reference measurements.
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OAM-Induced Lattice Rotation Reveals a Fractional Optimum in Fault-Tolerant GKP Quantum Sensing
Fractional OAM charge ℓ=1.5 induces an optimal 67.5° GKP lattice rotation that reduces error rate 23.9× with <0.2% loss in Fisher information and yields 41% higher metrological capacity.
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Quantum metrology via mitigation of single-photon loss using an engineered nonlinear oscillator
Engineered two-photon loss mitigates single-photon loss in TPD-Kerr systems by converting oscillatory decay to monotonic and extending metrological windows over an order of magnitude via non-Gaussian cat states.
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Multi-Parameter Multi-Critical Metrology of the Dicke Model
In the Dicke model, multiparameter critical metrology achieves square-root divergent scaling for two parameters via higher-order QFIM contributions, while a Dicke dimer with triple point restores quadratic scaling for specific pairs.
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Dispersive readout with two orthogonal modes of a dielectric cavity
A two-channel scheme with orthogonal modes in a dielectric cavity significantly improves dispersive readout sensitivity for NV-center magnetometers.
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Resource-efficient parallel entanglement generation for multinode quantum networks via time-bin multiplexing
A time-bin multiplexing protocol generates parallel multipartite entanglement among N quantum nodes using a photon whose time-bin dimension stays independent of N.
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Quantum-Enhanced Single-Parameter Phase Estimation with Adaptive NOON States
Gradient-descent optimization of eight circuit parameters in a Strawberry Fields model yields CFI gains of 153% to 1775% and 8x to 133x more useful events per pulse versus Afek et al. (2010) for N=2-5, reaching 82% of Heisenberg limit at N=2 and 58% at N=5.
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Quantum Entanglement in the Dirac Field Quantization around Charged Black Holes
Electric charge of a Reissner-Nordström black hole enhances decoherence of Dirac entanglement inside the horizon but can temporarily boost accessible entanglement outside, while Hawking radiation transfers correlations to inaccessible regions causing apparent loss for external observers.