Io-Chun Hoi, C. M. Wilson, Göran Johansson, Tauno Palomaki, Thomas M. Stace, Bixuan Fan, Per Delsing
We have investigated the cross Kerr phase shift of propagating microwave fields strongly coupled to an artificial atom. The artificial atom is a superconducting transmon qubit in an open transmission line. We demonstrate average phase shifts of 11 degrees per photon between two coherent microwave fields both at the single-photon level. At high control power, we observe phase shifts up to 30 degrees. Our results provide an important step towards quantum gates with propagating photons in the microwave regime.
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http://arxiv.org/abs/1207.1203
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