Quasi-Hamiltonian Method for Computation of Decoherence Rates

Abstract

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

15 pages, 4 figures

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• Magnetization Noise Induced Collapse and Revival of Rabi Oscillations in circuit QED
• 1/f Flux Noise in low-T${}_c$ SQUIDs due to Superparamagnetic Phase Transitions in Defect Clusters
• Non-Markovianity is not a resource for quantum spatial search on a star graph subject to generalized percolation
• Disappearance of entanglement: a topological point of view