RALPH, J.F. ... et al., 2003. Characterising a solid state qubit via environmental noise. Physics Letters A, 317 (3-4), pp. 199 - 205.
We propose a method for characterising the energy level structure of a solid state qubit by monitoring the noise level in its environment. We consider a model persistent current qubit in a lossy reservoir and demonstrate that the noise in a classical bias field is a sensitive function of the applied field.