Coupled Josephson qubits: Characterization of low-frequency charge noiseA. Mastellone, A. D'Arrigo, E. Paladino and G. Falci
MATIS, CNR-INFM, Catania, Italy, and Dipartimento di Metodologie Fisiche e Chimiche per l'Ingegneria (DMFCI), Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
Published online: 18 June 2008
The realization of coupled qubit setups is a fundamental step towards implementation of universal quantum computing architectures. Solid state nano- devices, despite being very promising from the point of view of scalability and integration, strongly suffer from various noise sources. Particular detrimental role is played by low-frequency noise components. Here we identify stability conditions against low-frequency charge noise of two Josephson qubits in a fixed coupling scheme implementation. The effects of adiabatic noise in an i-SWAP protocol is discussed. Reduced sensitivity to charge flutuations with respect to the single qubit setup is predicted.
© EDP Sciences, Springer-Verlag 2008