A scanning transmon qubit for strong coupling circuit quantum electrodynamics

W. E. Shanks (), D. L. Underwood and A. A. Houck
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W. E. Shanks: Princeton University
D. L. Underwood: Princeton University
A. A. Houck: Princeton University

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms2991

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