Pump Current as a Signal Transformation

  • Jun Ohkubo
Conference paper
Part of the Proceedings in Information and Communications Technology book series (PICT, volume 2)


A signal transformation from cyclic inputs to particle current by a simple stochastic system is studied. The stochastic system describes a simple particle hopping, and it is known that it generates a unidirectional current of particles, so-called “pump current”, under periodic perturbations. We give analytical results using a geometrical phase concept, and discuss the possibility of the pumping phenomenon as a natural computation; the stochastic system acts as a detector of the phase difference of two cyclic signals, or a converter of a cyclic signal into a unidirectional current of particles.


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Copyright information

© Springer Tokyo 2010

Authors and Affiliations

  • Jun Ohkubo
    • 1
  1. 1.Institute for Solid State PhysicsUniversity of TokyoChibaJapan

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