Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Transport: Quantum Coherence and Quantum Information Systems - Experiment (jointly with MA, HL)
MA 33.1: Talk
Wednesday, March 22, 2017, 09:30–09:45, HSZ 03
Adiabatic two-qubit state preparation in a superconducting qubit system — •Marc Ganzhorn1, Daniel Egger1, Andreas Fuhrer1, Nikolaj Moll1, Peter Mueller1, Marco Roth2, Sebastian Schmidt3, and Stefan Filipp1 — 1IBM Schweiz, Rueschlikon, Schweiz — 2Department fuer Physik, RWTH Aachen, Deutschland — 3Institut fuer Theoretische Physik, ETH Zuerich, Schweiz
The adiabatic transport of a quantum system from an initial eigenstate to its final state while remaining in the instantaneous eigenstate of the driving Hamiltonian can be used for robust state preparation. With control over both qubit frequencies and qubit-qubit couplings this method can be used to drive the system from initially trivial eigenstates of the uncoupled qubits to complex entangled multi-qubit states. In the context of quantum simulation, the final state may encode a non-trivial ground-states of a complex molecule, or the solution to an optimization problem in the context of adiabatic quantum computing. Here we present experimental results on a system comprising fixed-frequency superconducting transmon qubits and a tunable coupler to adjust the qubit-qubit coupling via parametric frequency modulation. We realize different types of interaction terms by adjusting the frequency of the modulation. A slow variation of drive amplitude and phase leads to an adiabatic steering of the system to its final state showing entanglement between the qubits.