Space-time-bounded quantum fields for detection processes.

WE DISCUSS A QUANTUM FIELD DETECTION MODEL COMPRISING TWO TYPES OF DETECTION PROCEDURES: maximal detection, where the initial state of the system and detectors undergoes an irreversible evolution, and minimal detection, where the system-detector interaction consists of a small, reversible coupling and posterior maximal detection performed over the detector system. Combined, these detection procedures allow for a time-dependent description of signalling experiments involving yes/no type of questions. A particular minimal detection model, stable in the presence of the vacuum, is presented and studied, successfully reproducing the localization of the state after a detection.