Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes

Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes

J. Q. You,1,2 Xuedong Hu,1,3 and Franco Nori1,4 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan 2Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China 3Department of Physics, University at Buffalo, SUNY, Buffalo, New York 14260-1500, USA 4Center for Theoretical Physics...

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

One of the challenges of adiabatic control theory is the proper inclusion of the effects of dissipation. Here we study the adiabatic dynamics of an open two-level quantum system deriving a generalized master equation to consistently account for the combined action of the driving and dissipation. We demonstrate that in the zero-temperature limit the ground state dynamics is not affected by envir...

Superadiabatic theory for Cooper pair pumping under decoherence

Entanglement and decoherence of a micromechanical resonator via coupling to a Cooper-pair box.

We analyze the quantum dynamics of a micromechanical resonator capacitively coupled to a Cooper-pair box. With appropriate quantum state control of the Cooper box, the resonator can be driven into a superposition of spatially separated states. The Cooper box can also be used to probe the decay of the resonator superposition state due to environmental decoherence.

Luminescence of a cooper pair.

This Letter theoretically discusses the photon emission spectra of a superconducting p-n junction. On the basis of the second order perturbation theory for electron-photon interaction, we show that the recombination of a Cooper pair with two p-type carriers causes enhancement of the luminescence intensity. The calculated results of photon emission spectra explain characteristic features of obse...