Thermodynamic Entropy of Computer Devices.

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  • Fuchikami Nobuko
    Department of Physics, Tokyo Metropolitan University, Tokyo 192–0397
  • Iwata Hijiri
    Department of Physics, Tokyo Metropolitan University, Tokyo 192–0397
  • Ishioka Shunya
    Department of Information Science, Kanagawa University, Kanagawa 259–1293

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To elucidate several issues relating to the thermodynamics of computations, we performed a simulation of a binary device using a Langevin equation. The simulation confirmed that the minimum energy consumption for a cycle of recording and erasing one-bit of information is kT ln 2 as suggested by Landauer. On the basis of our numerical results, we consider how to estimate the thermodynamic entropy of computational devices. We then argue against the existence of the so-called residual entropy in frozen systems such as ice.

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