QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Instituut-Lorentz, Leiden University, 2300 RA Leiden, The Netherlands.
Phys Rev Lett. 2015 Sep 18;115(12):127002. doi: 10.1103/PhysRevLett.115.127002. Epub 2015 Sep 14.
We report the realization of quantum microwave circuits using hybrid superconductor-semiconductor Josephson elements comprised of InAs nanowires contacted by NbTiN. Capacitively shunted single elements behave as transmon circuits with electrically tunable transition frequencies. Two-element circuits also exhibit transmonlike behavior near zero applied flux but behave as flux qubits at half the flux quantum, where nonsinusoidal current-phase relations in the elements produce a double-well Josephson potential. These hybrid Josephson elements are promising for applications requiring microwave superconducting circuits operating in a magnetic field.
我们报告了使用由 NbTiN 接触的 InAs 纳米线组成的混合超导-半导体约瑟夫森元件实现量子微波电路。电容分压器单元件表现为电可调谐跃迁频率的超导转变元电路。两个元件的电路在零外加磁通附近也表现出类似超导转变元的行为，但在半磁通量子时表现为磁通量子比特，其中元件中的非正弦电流-相位关系产生双势阱约瑟夫森势。这些混合约瑟夫森元件有望应用于需要在磁场中工作的微波超导电路。
