Conditional Action and Imperfect Erasure of Qubits

Autor(en): Schmidt, Heinz-Juergen
Stichwörter: conditional action; erasure of memory; Maxwell’ Physics; Physics, Multidisciplinary; s demon
Erscheinungsdatum: 2021
Herausgeber: MDPI
Journal: ENTROPY
Volumen: 23
Ausgabe: 3
Zusammenfassung: 
We consider state changes in quantum theory due to ``conditional action'' and relate these to the discussion of entropy decrease due to interventions of ``intelligent beings'' and the principles of Szilard and Landauer/Bennett. The mathematical theory of conditional actions is a special case of the theory of ``instruments'', which describes changes of state due to general measurements and will therefore be briefly outlined in the present paper. As a detailed example, we consider the imperfect erasure of a qubit that can also be viewed as a conditional action and will be realized by the coupling of a spin to another small spin system in its ground state.
DOI: 10.3390/e23030289

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