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Published on: March 30, 2017
Logical and thermodynamical reversibility: Optimized experimental implementation of the not operation
Salambô Dago1, Ludovic Bellon1
1Univ Lyon, ENS de Lyon, CNRS, Laboratoire de Physique, F-69342 Lyon, France.
Abstract:
The not operation is a reversible transformation acting on a 1-bit logical state and should be achievable in a physically reversible manner at no energetic cost. We experimentally demonstrate a bit-flip protocol based on the momentum of an underdamped oscillator confined in a double-well potential. The protocol is designed to be reversible in the ideal dissipationless case, and the thermodynamic work required is inversely proportional to the quality factor of the system. Our implementation demonstrates an energy dissipation significantly lower than the minimal cost of information processing in logically irreversible operations. It is, moreover, performed at high speed: A fully equilibrated final state is reached in only half a period of the oscillator. The results are supported by an analytical model that takes into account the presence of irreversibility. This Research Letter concludes with a discussion of optimization strategies.
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