Phys Rev Lett. 2013 Jun 21;110(25):250502. doi: 10.1103/PhysRevLett.110.250502. Epub 2013 Jun 18.

Minimum energy surface required by quantum memory devices.

Physical review letters

Wim van Dam, Hieu D Nguyen

PMID: 23829720 DOI: 10.1103/PhysRevLett.110.250502

Abstract

We address the question of what physical resources are required and sufficient to store classical information. While there is no lower bound on the required energy or space to store information, we find that there is a nonzero lower bound for the product P = of these two resources. Specifically, we prove that any physical system of mass m and d degrees of freedom that stores S bits of information will have a lower bound on the product P that is proportional to d2/m(exp(S/d) - 1)2. This result is obtained in a nonrelativistic, quantum mechanical setting, and it is independent of earlier thermodynamical results such as the Bekenstein bound on the entropy of black holes.

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• Journal Article