Results 91 to 100 of about 142,025 (180)
Weak measurements enhancing the quantum information facets of a driven Unruh–DeWitt detector
Frontiers in PhysicsWe developed a Hermitian operator representation of the Unruh channel for a driven accelerated detector in the presence of external noise. This representation is then used to provide a generalized analytical approach to a non-inertial evolution subjected
Jia-Ling Xie +4 more
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European Physical Journal C: Particles and Fields, 2019 We introduce and study a quantum channel that arises from the structure of the vacuum state of Dirac fields propagating in a Garfinkle–Horowitz–Strominger ($$\mathrm {GHS}$$ GHS ) dilation black hole spacetime.
Yumeng Huang +3 more
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Quantum Metrology: Extended Convexity of Quantum Fisher Information
, 2014 5 pages + supplemental material (3 pages) + 1 ...
Alipour, S., Rezakhani, A. T.
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Uncertainty principle with quantum Fisher information [PDF]
Journal of Mathematical Physics, 2008 In this paper we prove a lower bound for the determinant of the covariance matrix of quantum mechanical observables, which was conjectured by Gibilisco et al. and has the interpretation of uncertainty. The lower bound is given in terms of the commutator of the state and the observables and quantum Fisher information (generated by an operator monotone ...
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Heisenberg Limit beyond Quantum Fisher Information
, 2023 The Heisenberg limit provides a fundamental bound on the achievable estimation precision with a limited number of $N$ resources used (e.g., atoms, photons, etc.). Using entangled quantum states makes it possible to scale the precision with $N$ better than when resources would be used independently.
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Quantum estimation of cosmological parameters
Journal of High Energy PhysicsUnderstanding how well future cosmological experiments can reconstruct the mechanism that generated primordial inhomogeneities is key to assessing the extent to which cosmology can inform fundamental physics.
Michał Piotrak +3 more
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Quantum properties of classical Fisher information [PDF]
Physical Review A, 2000 The Fisher information of a quantum observable is shown to be proportional to both (i) the difference of a quantum and a classical variance, thus providing a measure of nonclassicality; and (ii) the rate of entropy increase under Gaussian diffusion, thus providing a measure of robustness.
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Coherence-Enhanced Single-Qubit Thermometry out of Equilibrium
EntropyThe metrological limits of thermometry operated in nonequilibrium dynamical regimes are analyzed. We consider a finite-dimensional quantum system, employed as a quantum thermometer, in contact with a thermal bath inducing Markovian thermalization ...
Gonçalo Frazão +4 more
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Effects of partial measurements on quantum resources and quantum Fisher information of a teleported state in a relativistic scenario. [PDF]
Proc Math Phys Eng Sci, 2020 Jafarzadeh M +2 more
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Fisher information rates in sequentially measured quantum systems
New Journal of PhysicsWe consider the impact that temporal correlations in the measurement statistics can have on the achievable precision in a sequential metrological protocol.
Eoin O’Connor +2 more
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