Measurements in QFT: Weakly coupled local particle detectors and entanglement harvesting
arXiv:2108.02794 · doi:10.1103/PhysRevD.104.085014
Abstract
We present a comparison of the AQFT-based Fewster-Verch framework with the Unruh-DeWitt particle detector models commonly employed in relativistic quantum information and QFT in curved space. We use this comparison to respond to a recent paper [arXiv:2103.13400] in which it was argued that the Reeh-Schlieder theorem prevents weakly coupled local particle detectors from harvesting vacuum entanglement from a quantum field. Their claim can be traced back to the mixedness that a local particle detector cannot escape from because of the entanglement that it must have with the quantum fields outside of the localization area. We argue that for any realistic scale of localization for physical particle detectors the effect of that mixedness is negligible, and that weakly coupled localized particle detectors are not impeded from harvesting vacuum entanglement.
arXiv comment28 pages, 7 Figures. RevTeX 4.2. v2 updated to match published version (including updated title)
References in corpus (33)
- Gaussian Quantum Information
- Quantum computing with trapped ions
- Entanglement from the vacuum
- Violating Bell's inequalities in the vacuum
- Entangling Power of an Expanding Universe
- Harvesting correlations from the quantum vacuum
- How often does the Unruh-DeWitt detector click? Regularisation by a spatial profile
- Entanglement harvesting from the electromagnetic vacuum with hydrogenlike atoms
- Spacetime structure and vacuum entanglement
- Detectors for probing relativistic quantum physics beyond perturbation theory
- Harvesting Entanglement from the Black Hole Vacuum
- Then again, how often does the Unruh-DeWitt detector click if we switch it carefully?
- Cosmological quantum entanglement
- Causality issues of particle detector models in QFT and Quantum Optics
- Backreaction and Unruh effect: New insights from exact solutions of uniformly accelerated detectors
- Translation of Lueders' "Uber die Zustandsanderung durch den Messprozess"
- Quantum delocalization, gauge and quantum optics: The light-matter interaction in relativistic quantum information
- General Relativistic Quantum Optics: Finite-size particle detector models in curved spacetimes
- Broken covariance of particle detector models in relativistic quantum information
- Relativistic Quantum Optics: On the relativistic invariance of the light-matter interaction models
- Impossible measurements require impossible apparatus
- Relativistic causality in particle detector models: Faster-than-light signalling and "Impossible measurements"
- Quantization of linearized gravity in cosmological vacuum spacetimes
- Quantum Information Processing and Relativistic Quantum Fields
- Neutrino flavor oscillations without flavor states
- Work distributions on quantum fields
- Impossible measurements revisited
- Thermal Green Functions in Coordinate Space for Massless Particles of any Spin
- Vacuum entanglement harvesting with a zero mode
- The First Law of Quantum Field Thermodynamics
- Duality in the dynamics of Unruh-DeWitt detectors in conformally related spacetimes
- Algebraic conformal quantum field theory in perspective
- Useless Qubits in "Relativistic Quantum Information"
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- A detector-based measurement theory for quantum field theory
- Non-Abelian symmetry can increase entanglement entropy
- Localized non-relativistic quantum systems in curved spacetimes: a general characterization of particle detector models
- Effective master equations for two accelerated qubits
- Entanglement structure of quantum fields through local probes
- Spacetime curvature from ultra rapid measurements of quantum fields
- Entanglement harvesting: state dependence and covariance
- Quantum kicks near a Cauchy horizon