Overwriting information: Correlations,physical costs,and environment models |
| |
Authors: | Neal G Anderson |
| |
Institution: | Department of Electrical and Computer Engineering, University of Massachusetts Amherst, Amherst, MA 01003-9292, USA |
| |
Abstract: | 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 “single-shot” and “sequential” 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. |
| |
Keywords: | Overwriting Information erasure Landauer?s Principle Physical information Thermodynamics of computation |
本文献已被 ScienceDirect 等数据库收录! |
|