Tunneling Spectroscopy of Two-Level Systems Inside a Josephson Junction
I. Martin, L. Bulaevskii, A. Shnirman
DOI 10.1103/PhysRevLett.95.127002 · Physical Review Letters
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Abstract
We consider a two-level system (TLS) with energy level separation ℏΩ0 inside a Josephson junction. The junction is shunted by a resistor R and is voltage V biased. If the TLS 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=ℏΩ0. The Rabi oscillations, in turn, translate into oscillations of current and voltage that can be detected in noise measurements. This effect provides an option to fully characterize the TLS inside Josephson junction and to find the TLS’s contribution to the decoherence when the junction is used as a qubit.
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