Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 6: Transport: Quantum Coherence and Quantum Information Systems - Theory I
TT 6.2: Talk
Monday, March 31, 2014, 11:15–11:30, HSZ 204
Controlling qubits with tight frequency separation — Daniel Egger1, Visa Vesterinen2, Ron Schutjens1,2, Fadi Abu Dagga1, Olli-Pentti Saira2, Alessandro Bruno2, Leo DiCarlo2, and •Frank Wilhelm1 — 1Theoretical Physics, Saarland University, Saarbrücken, Germany — 2Quantum Transport, Kavli Institute for Nanoscience, TU Delft, The Netherlands
As quantum computer architectures are scaled up, addressing multiple qubits by their individual frequencies becomes increasingly difficult. This is in particular true for superconducting transmon qubits which in themselves are anharmonic oscillators. We present a strategy to combat closeness of wanted and unwanted transitions in multiple qubits that allows to significantly reduce this problem. This Weak AnHarmonicity With Average Hamiltonian (WAHWAH) ]1] technique can handle cases that go beyond the familiar DRAG method [2].This technique is based on sideband modulation. We show experimentally that this technique allows two-transmon settings with significant frequency overlap to reach fidelities, as measured by interleaved randomized benchmarking, limited by decoherence alone.
R. Schutjens et al., Phys. Rev. A 88, 052330 (2013)
F. Motzoi et al., Phys. Rev. Lett. 103, 110501 (2009)