Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 4: Superconductivity: Qubits I
TT 4.10: Talk
Monday, March 12, 2018, 12:00–12:15, H 2053
Parametrically activated two-qubit interactions in a superconducting qubit system — •Marc Ganzhorn1, Marco Roth2, Gian Salis1, Nikolaj Moll1, Sebastian Schmidt3, and Stefan Filipp1 — 1IBM Research, Zurich, Switzerland — 2RWTH, Aachen, Germany — 3ETH, Zurich, Switzerland
A current bottleneck for quantum computation is the realization of high-fidelity two-qubit operations in arrays of more than two coupled qubits. Gates based on parametrically driven tunable couplers offer a convenient method to entangle multiple qubits by selectively activating different interaction terms in the effective Hamiltonian. Here we present experimental results on a system comprising fixed-frequency superconducting transmons capacitively coupled to a tunable coupler (in this case a flux tunable qubit). The two-qubit interactions are activated via a parametric frequency modulation. We realize different types of interactions with fidelities up to 97% by adjusting the frequency and phase of this modulation. Our experimental findings are backed by numerical simulations, revealing that the fidelities of these two qubit operations are limited by the coherence of the tunable coupler. Finally, using such a set of single and two qubit interactions, simulation of quantum systems such as molecules or spin systems could be realized.