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TT: Fachverband Tiefe Temperaturen

TT 6: Transport: Quantum Coherence and Quantum Information Systems - Theory I

TT 6.2: Vortrag

Montag, 31. März 2014, 11:15–11:30, HSZ 204

Controlling qubits with tight frequency separation — Daniel Egger¹, Visa Vesterinen², Ron Schutjens^1,2, 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)