Quantum

Photon localization: Local measurements, localized states, and causality

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 23/10/2026, 04:13:25 UTC.

Briefings

This article reviews relativistic particle localization by arguing that local measurement is the most useful approach, linking it to measurable outcomes and the Reeh-Schlieder theorem. It clarifies that single photons cannot be strictly localized, while coherent states can, and discusses strategies for constructing such states. The paper analyzes the relationship between localization, causality, and on-demand sources, finding that strictly localized states can represent localized, propagating information in quantum field theory.

Key points

• Single photons cannot be strictly localized in quantum field theory, whereas coherent states can.
• Strictly localized states can represent localized, propagating information in quantum field theory.

Context

The article reviews relativistic particle localization, arguing that local measurement is the most useful approach. It ties localization directly to measurable outcomes in spacetime and discusses the Reeh-Schlieder theorem.

Limitations

Evidence is limited to an arXiv preprint; no experimental data or specific dates are provided.

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