Engineering the quantum measurement process for the persistent current qubit

The SQUID used to measure the flux state of a superconducting flux-based qubit interacts with the qubit and transmits its environmental noise to the qubit. thus causing the relaxation and dephasing of the qubit state. The SQUID-qubit system is analyzed and the effect of the transmittal of environmental noise is calculated. The method presented can also be applied to other quantum systems. (C) 2001 Elsevier Science B.V, All rights reserved.