Qubit Architecture with High Coherence and Fast Tunable Coupling

We introduce a superconducting qubit architecture that combines high-coherence qubits and tunable qubit-qubit coupling. With the ability to set the coupling to zero, we demonstrate that this architecture is protected from the frequency crowding problems that arise from fixed coupling. More importantly, the coupling can be tuned dynamically with nanosecond resolution, making this architecture a versatile platform with applications ranging from quantum logic gates to quantum simulation. We illustrate the advantages of dynamical coupling by implementing a novel adiabatic controlled-z gate, with a speed approaching that of single-qubit gates. Integrating coherence and scalable control, the introduced qubit…

• NS
  National Science Foundation

  Award: DMR-1029764
• OO
  Office of the Director of National Intelligence

  Award: W911NF-10-1-0334
• IA
  Intelligence Advanced Research Projects Activity

  Award: W911NF-10-1-0334
• AR
  Army Research Office

  Award: W911NF-10-1-0334