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Generation of Superposition States and Charge-Qubit Relaxation Probing in a Circuit

By O. P. de Sa Neto, M. C. de Oliveira and A. O. Caldeira

Abstract

We demonstrate how a superposition of coherent states can be generated for a microwave field inside a coplanar transmission line coupled to a single superconducting charge qubit, with the addition of a single classical magnetic pulse for chirping of the qubit transition frequency. We show how the qubit dephasing induces decoherence on the field superposition state, and how it can be probed by the qubit charge detection. The character of the charge qubit relaxation process itself is imprinted in the field state decoherence profile.Comment: 6 pages, 4 figure

Topics: Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Year: 2011
DOI identifier: 10.1088/0953-4075/44/13/135503
OAI identifier: oai:arXiv.org:1104.5189
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