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arXiv · 1212.0726

Cavity-Mediated Entanglement Generation Via Landau-Zener Interferometry

C. M. Quintana·K. D. Petersson·L. W. McFaul·S. J. Srinivasan·A. A. Houck·J. R. Petta
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Abstract

We demonstrate quantum control and entanglement generation using a Landau-Zener beam splitter formed by coupling two transmon qubits to a superconducting cavity. Single passage through the cavity-mediated qubit-qubit avoided crossing provides a direct test of the Landau-Zener transition formula. Consecutive sweeps result in Landau-Zener-Stuckelberg interference patterns, with a visibility that can be sensitively tuned by adjusting the level velocity through both the non-adiabatic and adiabatic regimes. Two-qubit state tomography indicates that a Bell state can be generated via a single passage, with a fidelity of 78% limited by qubit relaxation.

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C. M. Quintana, K. D. Petersson, L. W. McFaul, S. J. Srinivasan, A. A. Houck, J. R. Petta. 2012-12-04. Cavity-Mediated Entanglement Generation Via Landau-Zener Interferometry. https://doi.org/10.1103/physrevlett.110.173603

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