Assisted harvesting and catalysis of coherence from scalar fields

Abstract

Recently it has been demonstrated that it is possible to harvest quantum resources other than entanglement from a coherent scalar field. Employing time-dependent perturbation theory, we present a complete analysis of the conditions under which a spatially extended Unruh-DeWitt detector coupled to the proper time derivative of the field can harvest coherence for any initial state of the field, as well as the energy cost that is required for each harvest. By studying harvesting under repeatable extractions it is proven that when the detector interacts with the field through a delta coupling coherence is catalytic. For a Gaussian smeared detector it is shown that harvesting from a coherent field depends on the phase of its amplitude distribution and its initial energy as well as on the mean radius of the detector and the mean interaction duration between the two. For a detector moving at a constant velocity and with a mean radius of the same order as its transition wavelength, we observe that, for relativistic speeds, coherence swelling effects are present the intensity of which depends on the dimension of the underlying Minkowski spacetime.

References in corpus (12)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Measuring Quantum Coherence with Entanglement
• Reference frames, superselection rules, and quantum information
• Description of quantum coherence in thermodynamic processes requires constraints beyond free energy
• Quantum coherence, time-translation symmetry and thermodynamics
• The resource theory of quantum reference frames: manipulations and monotones
• Extending Noether's theorem by quantifying the asymmetry of quantum states
• How often does the Unruh-DeWitt detector click? Regularisation by a spatial profile
• Wavepacket detection with the Unruh-DeWitt model
• Onset and decay of the 1+1 Hawking-Unruh effect: what the derivative-coupling detector saw
• Non-perturbative analysis of entanglement harvesting from coherent field states
• Field assisted extraction and swelling of quantum coherence for moving Unruh-DeWitt detectors

Cited by in corpus (9)

• Axion-Like Dark Matter Detection Using Stern-Gerlach Interferometer
• An exactly solvable relativistic quantum Otto engine
• Cohering and decohering power of massive scalar fields under instantaneous interactions
• Harvesting quantum coherence from axion dark matter
• Thermality of the Unruh effect with intermediate statistics
• Relative entropy formulation of thermalization process in a Schwarzschild spacetime
• Entangled states dynamics of moving two-level atoms in a thermal field bath
• Coherence revival under the Unruh effect and its metrological advantage
• Quantum kicks near a Cauchy horizon