Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-09-06
Phys. Rev. B 76, 104520 (2007)
Physics
Condensed Matter
Soft Condensed Matter
In this version the Introduction, the NMR application part and some text are modified, several new references are added. Some
Scientific paper
10.1103/PhysRevB.76.104520
We have analyzed a dissipative two level quantum system (TLS) which is continuously and simultaneously irradiated by a high and low frequency excitation. The interaction of the TLS with a high frequency excitation is considered in the frame of the dressed state approach. A linear response of the coupled TLS and corresponding photon field system to a signal whose frequency is of the order of the Rabi frequency is found. The response exhibits undamped low frequency oscillations, whose amplitude has a clear resonance at the Rabi frequency with the width being dependent on the damping rates of the TLS. The method can be useful for low-frequency Rabi spectroscopy in various physical systems described by a two-level Hamiltonian, such as nuclei spins in NMR, double well quantum dots, superconducting flux and charge qubits, etc. The application of the method to a superconducting flux qubit and to the detection of NMR is considered in detail.
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