\n1. Atomic sized two-level systems (TLSs) in dielectrics are known as a major source of loss in superconducting devices\, particularly due to frequency noise. However\, the induced frequency shifts on the devices\, even by far off-resonance TLSs\, is often suppressed by symmetry when standard single-tone spectroscopy is used. We introduce a two-tone spectroscopy on the normal modes of a p air of coupled superconducting coplanar waveguide resonators to uncove r this effect by asymmetric saturation. Together with an appropriate g eneralized saturation model this enables us to extract the average sin gle-photon Rabi frequency of dominant TLSs to be Ω0/2π≈79 kHz. At high photon numbers we observe an enhanced sensitivity to nonlinear ki netic inductance when using the two-tone method and estimate the value of the Kerr coefficient as K/2π≈−1×10−4 Hz/photon. Furthermor e\, the life-time of each resonance can be controlled (increased) by p umping of the other mode as demonstrated both experimentally and theor etically.

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\n2. Multiple bosons undergoing coherent evolutio n in a coupled network of resonators constitute a so-called quantum wa lk system. The simplest example of such a two-particle interference is the celebrated Hong-Ou-Mandel interference. When scaling to larger bo son numbers\, simulating the exact distribution of bosons has been sho wn\, under reasonable assumptions\, to be exponentially hard. We analy ze the feasibility and expected performance of a globally connected su perconducting resonator based quantum walk system\, using the known ch aracteristics of state-of-the-art components. We simulate the sensitiv ity of such a system to decay processes and to perturbations and compa re with coherent input states. URL:https://wp.physics.wisc.edu/twap/?id=4455 END:VEVENT END:VCALENDAR