Intrinsic quantum computation |
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Authors: | James P Crutchfield Karoline Wiesner |
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Institution: | Center for Computational Science & Engineering and Physics Department, University of California Davis, One Shields Avenue, Davis, CA 95616, USA |
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Abstract: | We introduce ways to measure information storage in quantum systems, using a recently introduced computation-theoretic model that accounts for measurement effects. The first, the quantum excess entropy, quantifies the shared information between a quantum process's past and its future. The second, the quantum transient information, determines the difficulty with which an observer comes to know the internal state of a quantum process through measurements. We contrast these with von Neumann entropy and quantum entropy rate and provide a closed-form expression for the latter for the class of deterministic quantum processes. |
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Keywords: | 03 67 -a 89 70 +c 05 45 -a 03 67 Lx |
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