Decoherence of two Josephson charge qubits coupled via σx σx -type coupling and exposed to σx noise
Abstract
Decoherence properties of two Josephson charge qubits coupled via the σx σx type are investigated. Considering the special structure of this new design, the dissipative effects arising from the circuit impedance providing the fluxes for the qubits’ superconducting quantum interference device loops coupled to the σx qubit variables are considered. The results show that the overall decoherence effects are significantly strong in this qubit design. It is found that the dissipative effects are stronger in the case of coupling to two uncorrelated baths than are found in the case of one common bath.
- Publication:
-
Physical Review A
- Pub Date:
- May 2004
- DOI:
- 10.1103/PhysRevA.69.052309
- Bibcode:
- 2004PhRvA..69e2309A
- Keywords:
-
- 03.67.Lx;
- 03.65.Yz;
- 05.40.-a;
- Quantum computation;
- Decoherence;
- open systems;
- quantum statistical methods;
- Fluctuation phenomena random processes noise and Brownian motion