Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.17: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
Robust two-qubit gates using pulsed dynamical decoupling — •Patrick Barthel1, Jorge Casanova2, Patrick Huber1, Theeraphot Sriarunothai1, Gouri Giri1, Martin Plenio2, and Christof Wunderlich1 — 1Department Physik, Universität Siegen, 57068 Siegen, Germany — 2Institut für Theoretische Physik, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm, Germany
To extend the coherence time of qubits, for example in trapped atomic ions, continuous or pulsed dynamical decoupling (DD) schemes have been successfully applied. Recently, a novel DD sequence was proposed to generate robust high-fidelity two-qubit phase gates with trapped ions, and, by using both motional modes of a two-ion crystal, allow for faster gate speeds than a single-mode bus qubit [1]. Here we report on the experimental implementation of this sequence, demonstrating the realization of a π/4-gate using microwave driving fields on a set of two 171Yb+ ions in a linear Paul trap. The interaction between motional states and internal qubit states necessary for conditional quantum logic is provided by magnetic gradient induced coupling (MAGIC) [2]. While the current experimental setup does not allow yet to exploit a considerable speed-up, the robustness of the sequence to errors in Rabi and trap frequencies up to 2%, and to ion temperature is demonstrated, as well as its applicability for Controlled NOT operations and the creation of Bell states.
[1] I. Arrazola et al., Phys. Rev. A 97, 052312 (2018)
[2] T. Sriarunothai et al., 2018, Quantum Sci. Technol.,
DOI: 10.1088/2058-9565/aaef5e