@article{146266,
  author = {W. E. Shanks and D. L. Underwood and A. A. Houck},
  title = {A scanning transmon qubit for strong coupling circuit quantum electrodynamics},
  abstract = { Like a quantum computer designed for a particular class of problems, a quantum simulator enables quantitative modeling of quantum systems that is computationally intractable with a classical computer. Quantum simulations of quantum many-body systems have been performed using ultracold atoms and trapped ions among other systems. Superconducting circuits have recently been investigated as an alternative system in which microwave photons confined to a lattice of coupled resonators act as the particles under study with qubits coupled to the resonators producing effective photon-photon interactions. Such a system promises insight into the nonequilibrium physics of interacting bosons but new tools are needed to understand this complex behavior. Here we demonstrate the operation of a scanning transmon qubit and propose its use as a local probe of photon number within a superconducting resonator lattice. We map the coupling strength of the qubit to a resonator on a separate chip and show that the system reaches the strong coupling regime over a wide scanning area. },
  year = {2013},
  journal = {Nature Communications},
  volume = {4},
  pages = {1{\textendash}6},
  publisher = {Nature Publishing Group},
  issn = {20411723},
  url = {http://dx.doi.org/10.1038/ncomms2991},
  doi = {10.1038/ncomms2991},
  language = {eng},
}