Bianchetti, R ; Filipp, Stefan ; Baur, Matthias P ; Fink, Johannes MIST Austria ; Lang, C ; Steffen, L. Kraig ; Boissonneault, Maxime ; Blais, Alexandre ; Wallraff, Andreas
A number of superconducting qubits, such as the transmon or the phase qubit, have an energy level structure with small anharmonicity. This allows for convenient access of higher excited states with similar frequencies. However, special care has to be taken to avoid unwanted higher-level populations when using short control pulses. Here we demonstrate the preparation of arbitrary three level superposition states using optimal control techniques in a transmon. Performing dispersive readout, we extract the populations of all three levels of the qutrit and study the coherence of its excited states. Finally we demonstrate full quantum state tomography of the prepared qutrit states and evaluate the fidelities of a set of states, finding on average 95%.
Physical Review Letters
This work was supported by SNF, ETHZ, the Austrian Science Foundation (FWF), and the EU projects SOLID and GEOMDISS. A. B. is supported by NSERC, the Alfred P. Sloan Foundation, and CIFAR
Bianchetti R, Filipp S, Baur M, et al. Control and tomography of a three level superconducting artificial atom. Physical Review Letters. 2010;105(22). doi:10.1103/PhysRevLett.105.223601
Bianchetti, R., Filipp, S., Baur, M., Fink, J. M., Lang, C., Steffen, L., … Wallraff, A. (2010). Control and tomography of a three level superconducting artificial atom. Physical Review Letters, 105(22). https://doi.org/10.1103/PhysRevLett.105.223601
Bianchetti, R, Stefan Filipp, Matthias Baur, Johannes M Fink, C Lang, L. Steffen, Maxime Boissonneault, Alexandre Blais, and Andreas Wallraff. “Control and Tomography of a Three Level Superconducting Artificial Atom.” Physical Review Letters 105, no. 22 (2010). https://doi.org/10.1103/PhysRevLett.105.223601.
R. Bianchetti et al., “Control and tomography of a three level superconducting artificial atom,” Physical Review Letters, vol. 105, no. 22, 2010.
Bianchetti R, Filipp S, Baur M, Fink JM, Lang C, Steffen L, Boissonneault M, Blais A, Wallraff A. 2010. Control and tomography of a three level superconducting artificial atom. Physical Review Letters. 105(22).
Bianchetti, R., et al. “Control and Tomography of a Three Level Superconducting Artificial Atom.” Physical Review Letters, vol. 105, no. 22, American Physical Society, 2010, doi:10.1103/PhysRevLett.105.223601.
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