Decoherence in adiabatic quantum evolution: application to cooper pair pumping.

Control of Open Quantum Systems

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Juha Salmilehto Name of the doctoral dissertation Control of Open Quantum Systems Publisher School of Science Unit Department of Applied Physics Series Aalto University publication series DOCTORAL DISSERTATIONS 102/2014 Field of research Engineering Physics, Theoretical and Computational Physics Manuscript submitted 13 May 201...

Superadiabatic theory for Cooper pair pumping under decoherence

Control of Quantum Evolution and Josephson Junction Circuits

Ever since Peter Shor's ground-breaking discovery in 1994 of an algorithm capable of factoring large integers on a quantum-mechanical computer exponentially faster than using any known classical method, research on quantum computing has boomed. Quantum information – a unique mixture of computer science, physics and mathematics – has developed into a new branch of information theory. On the expe...

Adiabatic transport of Cooper pairs in arrays of Josephson junctions

We have developed a quantitative theory of Cooper pair pumping in gated one-dimensional arrays of Josephson junctions. The pumping accuracy is limited by quantum tunneling of Cooper pairs out of the propagating potential well and by direct supercurrent flow through the array. Both corrections decrease exponentially with the number N of junctions in the array, but give a serious limitation of ac...

Sensitivity to parameters of STIRAP in a Cooper Pair Box

The rapid experimental progress in the field of superconducting nanocircuits gives rise to an increasing quest for advanced quantum-control techniques for these macroscopically coherent systems. Here we demonstrate theoretically that stimulated Raman adiabatic passage (STIRAP), a well-established method in quantum optics, should be possible with the quantronium setup of a Cooperpair box. We fin...