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A scanning transmon qubit for strong coupling circuit quantum electrodynamics

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  • W. E. Shanks

    (Princeton University)

  • D. L. Underwood

    (Princeton University)

  • A. A. Houck

    (Princeton University)

Abstract

Like a quantum computer designed for a particular class of problems, a quantum simulator enables quantitative modelling of quantum systems that is computationally intractable with a classical computer. 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 non-equilibrium physics of interacting bosons, but new tools are needed to understand this complex behaviour. 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.

Suggested Citation

  • W. E. Shanks & D. L. Underwood & A. A. Houck, 2013. "A scanning transmon qubit for strong coupling circuit quantum electrodynamics," Nature Communications, Nature, vol. 4(1), pages 1-6, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2991
    DOI: 10.1038/ncomms2991
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