Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Transport: Quantum Coherence and Quantum Information Systems 2 (jointly with MA and HL)

TT 11.3: Talk

Monday, March 26, 2012, 15:30–15:45, BH 243

Simple ways to avoid leakage in qubit systems — •Frank Wilhelm^1,2, Felix Motzoi², Seth Merkel³, and Jay Gambetta³ — ¹Theoretical Physics, Saarland University, Saarbrücken — ²IQC and Department of Physics and Astronomy, University of Waterloo, Canada — ³IBM Watson Research Laboratories, Yorktown Heights, NY, USA

No physical system is just a two-state qubit. Many qubit candidates are in fact weakly nonlinear oscillators with leakage transitions that lead outside the computational subspace that are spectrally close to the qubit transition. The simple DRAG pulse-shaping method allows to efficiently supress these leakage transitions. We will show that there is a whole family of DRAG pulses that also allow to enhance spectral selectivity through multiple channels, and that allow to selectively address qubits driven through a common control. These ideas are applied to superconducting phase qubits, Transmons, and circuit QED architectures.
F. Motzoi, J.M. Gambetta, P. Rebentrost, and F.K. Wilhelm, Phys. Rev. Lett. 103, 110501 (2009)
J.M. Gambetta, F. Motzoi, S.T. Merkel, and F.K. Wilhelm, Phys. Rev. A 2011