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Efficient creation of multipartite entanglement in flux qubits
Johannes Ferber, Frank K. Wilhelm
We investigate three superconducting flux qubits coupled in a loop. In this setup, tripartite entanglement can be created in a natural, controllable, and stable way. Both generic k…
Electronic structure of superposition states in flux qubits
J. I. Korsbakken, F. K. Wilhelm, K. B. Whaley
Flux qubits, small superconducting loops interrupted by Josephson junctions, are successful realizations of quantum coherence for macroscopic variables. Superconductivity in these…
Relaxation of a qubit measured by a driven Duffing oscillator
I. Serban, M. I. Dykman, F. K. Wilhelm
We investigate the relaxation of a superconducting qubit for the case when its detector, the Josephson bifurcation amplifier, remains latched in one of its two (meta)stable states…
Qubit decoherence due to detector switching
I. Serban, F. K. Wilhelm
We provide insight into the qubit measurement process involving a switching type of detector. We study the switching-induced decoherence during escape events. We present a simple m…
Simple pulses for elimination of leakage in weakly nonlinear qubits
F. Motzoi, J. M. Gambetta, P. Rebentrost +1
In realizations of quantum computing, a two-level system (qubit) is often singled out of the many levels of an anharmonic oscillator. In these cases, simple qubit control fails on…