Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Quantum Information Systems
(Joint session of HL, MA, O and TT organized by HL)
TT 23.2: Vortrag
Dienstag, 8. März 2016, 09:45–10:00, H15
Long distance coupling of resonant exchange qubits — •Maximilian Russ and Guido Burkard — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
We investigate the effectiveness of a microwave cavity as a mediator of interactions between two resonant exchange (RX) qubits [1,2] in semiconductor quantum dots (QDs) over long distances [3], limited only by the extension of the cavity. Our interaction model includes the orthonormalized Wannier orbitals constructed from Fock-Darwin states under the assumption of a harmonic QD confinement potential. We calculate the qubit-cavity coupling strength gr in a Jaynes Cummings Hamiltonian, and find that dipole transitions between two states with an asymmetric charge configuration constitute the relevant RX qubit-cavity coupling mechanism. The effective coupling between two RX qubits in a shared cavity yields a universal two-qubit iSWAP-gate with gate times on the order of nanoseconds over distances on the order of up to a millimeter.
[1] J. Medford et al., Phys. Rev. Lett. 111, 050501 (2013).
[2] J. M. Taylor, V. Srinivasa, and J. Medford, Phys. Rev. Lett. 111, 050502 (2013).
[3] M. Russ and G. Burkard, arXiv: 1508.07122 (2015)