%0 Journal Article %T Superconducting devices: Quantum cups and balls %A Billangeon, P-M %A Nakamura, Y. %J Nature Physics %D 2011 %V 7 %N 8 %F Billangeon+Nakamura2011 %O exported from refbase (https://db.rplab.ru/refbase/show.php?record=820), last updated on Sat, 12 May 2012 14:54:37 -0500 %X A single microwave photon in a superposition of two states of different frequency is now demonstrated using a superconducting quantum interference device to mediate the coupling between two harmonics of a resonator. Such quantum circuits bring closer the possibility of controlling photon-photon interactions at the single-photon level. %K fromIPMRAS %P 594-595