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We study an exactly solvable model where an uniformly accelerated detector islinearly coupled to a massless scalar field initially in the Minkowski vacuum.Using the exact correlation functions we show that as soon as the coupling isswitched on one can see information flowing from the detector to the field andpropagating with the radiation into null infinity. By expressing the reduceddensity matrix of the detector in terms of the two-point functions, wecalculate the purity function in the detector and study the evolution ofquantum entanglement between the detector and the field. Only in the ultraweakcoupling regime could some degree of recoherence in the detector appear at latetimes, but never in full restoration. We explicitly show that under the mostgeneral conditions the detector never recovers its quantum coherence and theentanglement between the detector and the field remains large at late times. Tothe extent this model can be used as an analog to the system of a black holeinteracting with a quantum field, our result seems to suggest in the prevalentnon-Markovian regime, assuming unitarity for the combined system, that blackhole information is not lost but transferred to the quantum field degrees offreedom. Our combined system will evolve into a highly entangled state betweena remnant of large area (in Bekenstein's black hole atom analog) without anyinformation of its initial state, and the quantum field, now imbued withcomplex information content not-so-easily retrievable by a local observer.

Entanglement, recoherence and information flow in an accelerated detector - quantum field system: Implications for black hole information issue