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Bulletin of the American Physical Society

Progress towards a small-scale quantum annealer II: Device characterization and ultra-strong tunable coupling

Chris Quintana, Yu Chen, Dvir Kafri, Z. Chen, B. Chiaro, A. Dunsworth, Brooks Foxen, C. Neill, J. Wenner, Alireza Shabani, Hartmut Neven, John M. Martinis

Published Mar 13, 2017• 0 citations
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Quantum annealing can potentially be used to find better solutions to hard optimization problems faster than purely classical hardware. To take full advantage of quantum effects such as tunneling, a physical annealer should be comprised of qubits with a sufficient degree of quantum coherence. In addition, to encode useful problems, an annealer should provide a dense physical connectivity graph between qubits. Towards these goals, we develop superconducting ``fluxmon'' flux qubits suitable for high-connectivity quantum annealing without the use of performance-degrading lossy dielectrics. We carry out in-depth studies of noise and dissipation, and of qubit-qubit coupling in the strongly nonlinear regime. We perform the first frequency-resolved measurements extracting both the quantum and classical parts of the 1/f flux noise intrinsic to superconducting devices, and observe the classical-to-quantum crossover of the noise. We also identify atomic hydrogen as a magnetic dissipation source. We then implement tunable inter-qubit coupling compatible with high connectivity, and provide direct spectroscopic measurements of ultra-strong coupling between qubits. Finally, we use our system to explore quantum annealing faster than the system thermalization time, a previously unaccessed regime.