Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction

Details Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction

2005-02-18

arxiv.org/abs/cond-mat/0502436v1

Phys. Rev. Lett. 95, 127002 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages

Scientific paper

10.1103/PhysRevLett.95.127002

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 measurements. 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.

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