Robust Josephson-Kondo screening cloud in circuit quantum electrodynamics
Izak Snyman, Serge Florens
DOI 10.1103/PhysRevB.92.085131 · Physical Review B
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Abstract
We investigate the entanglement properties of a standard circuit-QED setup that consists of a Cooper pair box coupled to a long chain of Josephson junctions. We calculate the static charge polarization at finite distances along the device. Our calculations reveal a deep connection to the Kondo screening cloud, together with robust correlations that are difficult to measure in a condensed matter context. We also find weak sensitivity of these Kondo signatures to the actual parameters and design of the device, demonstrating the universality of the Josephson entanglement cloud.
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