The Retarded Gravitational Memory Channel for Quantum States

Investigated now is a speculative extension of quantum theory in which a quantum system can leavea locally generated, retarded and finite-lived trace in an additional gravitational memory sector. Thepurpose is not to modify standard quantum mechanics phenomenologically at ordinary scales, but toformulate a mathematically explicit model in which quantum-state information is coupled to anouter gravitational memory field. This field copys information without generating decoherence ofthe used quantum system like a shadow .[ ...] The construction nevertheless requires physics beyond standard linear quantum mechanics iff the gravitational memory is operationally readable while the original quantum state remains exactly undisturbed. Identified then is this requirement as the central theoretical postulate of the model.Further distinguished is state memory from history memory and discussed are the conditions underwhich a finite-lived gravitational record could be compatible with locality and causal propagation.The model is therefore not presented as an established theory of quantum gravity, but as acontrolled mathematical framework in which the consistency requirements of a hypotheticalgravitational quantum-memory channel can be tested explicitly, if there is the possibility that gravit-Eve can decrypt the quantum channel between Alice and Bob in form of a „quantum-memory-print“(QUAMP).