Decoherence in a pair of long-lived 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

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...

What Is a Cooper Pair?

Superconductivity and Fermi superfluidity have been subjects of increasing interest since their discovery. It seems as if nature wisely entangled Bose-Einstein (BE) condensation with these collective phenomena which are direct macroscopic manifestations of quantum physics. Recently, the nature of Cooper pairs in the BCS-BEC crossover has regained attention due to the observation of a large frac...