Overwriting information: Correlations, physical costs, and environment models

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• 作者：Neal G. Anderson ^{anderson@ecs.umass.edu}
• 关键词：Overwriting ; Information erasure ; Landauer始s Principle ; Physical information ; Thermodynamics of computation
• 刊名：Physics Letters A
• 出版年：2012
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：26 March, 2012
• 卷：376
• 期：17
• 页码：1426-1433
• 文件大小：347 K

摘要

In this sequel to our previous study of the entropic and energetic costs of information erasure [N.G. Anderson, Phys. Lett. A 372 (2008) 5552], we consider direct overwriting of classical information encoded in a quantum-mechanical memory system interacting with a heat bath. Lower bounds on physical costs of overwriting - in both 鈥渟ingle-shot鈥?and 鈥渟equential鈥?overwriting scenarios - are obtained from globally unitary quantum dynamics and entropic inequalities alone, all within a referential approach that grounds information content in correlations between physical system states. A heterogeneous environment model, required for consistent treatment of sequential overwriting, is introduced and used to establish and relate bounds for various cases.