Sang Wook Kim

SZILARD'S ENGINE REVISITED: DC CURRENT AND PARTICLE TRAPPING

Szilard's engine is a machine that extracts mechanical work from information entropy. I propose a new mechanism to generate a dc current of particles at
 zero bias based on the basic principle of Szilard's engine. It is shown that a dc current arises if the transport process in one direction is maintained
 coherent while the process in the opposite direction is incoherent. I provide possible implementations of the idea using an atomic Michelson
 interferometer and a ring interferometer. I also discuss possibility of particle trapping induced by the interplay between coherence and
 decoherence.e characterization of multipartite entanglement is a central problem in quantum information and many-body systems theory. We introduce
 the notion of maximally multipartite entangled states of n qubits as a generalization of the bipartite case. These pure states have a bipartite
 entanglement that does not depend on the bipartition and is maximal for all possible bipartitions. They are solutions of a minimization problem.
 Examples for small n are investigated, both analytically and numerically via deterministic and stochastic algorithms.