Conditional Action and Imperfect Erasure of Qubits

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Title: Conditional Action and Imperfect Erasure of Qubits
Authors: Schmidt, Heinz-Jürgen
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Abstract: 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.
Citations: Schmidt H. J. (2021): Conditional Action and Imperfect Erasure of Qubits. Entropy (Basel, Switzerland), 23(3), 289.
Subject Keywords: conditional action; Maxwell’s demon; erasure of memory
Issue Date: 26-Feb-2021
License name: Attribution 4.0 International
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Type of publication: Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Appears in Collections:FB04 - Hochschulschriften

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