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Tunneling Spectroscopy of Two-Level Systems Inside a Josephson Junction

I. Martin, L. Bulaevskii, A. Shnirman
2005 Physical Review Letters  

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2005 pre-print
arXiv:cond-mat/0502436v1 fatcat:s4h2iw64hjhxlmxgncvimio6eu
We consider a two-level (TL) system with energy level separation Omega_0 inside a Josephson junction. The junction is shunted by a resistor R and is current I (or voltage V = RI) biased. If the TL system modulates the Josephson energy and/or is optically active, it is Rabi driven by the Josephson oscillations in the running phase regime near the resonance 2eV = Omega_0. The Rabi oscillations, in turn, translate into oscillations of current and voltage which can be detected in noise
more » ... This effect provides an option to fully characterize the TL systems and to find the TL's contribution to the decoherence when the junction is used as a qubit.
doi:10.1103/physrevlett.95.127002 pmid:16197100 fatcat:2b3dptu63jgzvnvfwerpy6yfbe
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I. Martin, L. Bulaevskii, A. Shnirman. "Tunneling Spectroscopy of Two-Level Systems Inside a Josephson Junction." Physical Review Letters 95.12 (2005)