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For many implementations of quantum computing, 1/f and other types ofbroad-spectrum noise are an important source of decoherence. An important stepforward would be the ability to back out the characteristics of this noise fromqubit measurements and to see if it leads to new physical effects. For certaintypes of qubits, the working point of the qubit can be varied. Using a newmathematical method that is suited to treat all working points, we presenttheoretical results that show how this degree of freedom can be used to extractnoise parameters and to predict a new effect: noise-induced looping on theBloch sphere. We analyze data on superconducting qubits to show that they arevery near the parameter regime where this looping should be observed.

Quasi-Hamiltonian Method for Computation of Decoherence Rates