Quantum state engineering with Josephson-junction devices

Details Quantum state engineering with Josephson-junction devices Quantum state engineering with Josephson-junction devices

2000-11-15

arxiv.org/abs/cond-mat/0011269v1

Rev. Mod. Phys. 73, 357-400 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

An article prepared for Reviews of Modern Physics, 46 pages, 23 figures

Scientific paper

10.1103/RevModPhys.73.357

We review recent theoretical and experimental progress in quantum state engineering with Josephson junction devices. The concepts of quantum computing have stimulated an increased activity in the field. Either charges or phases (fluxes) of the Josephson systems can be used as quantum degrees of freedom, and their quantum state can be manipulated coherently by voltage and current pulses. They thus can serve as qubits, and quantum logic gates can be performed. Their phase coherence time, which is limited, e.g., by the electromagnetic fluctuations in the control circuit, is long enough to allow a series of these manipulations. The quantum measurement process performed by a single-electron transistor, a SQUID, or further nanoelectronic devices is analyzed in detail.

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