Low-frequency Rabi spectroscopy for a dissipative two-level systemYa. S. Greenberg1, E. Il'ichev2 and A. Izmalkov2
1 Novosibirsk State Technical University - 20 K. Marx Ave., 630092 Novosibirsk, Russia
2 Institute for Physical High Technology - P.O. Box 100239, D-07702 Jena, Germany
received 16 August 2005; accepted in final form 12 October 2005
published online 9 November 2005
We have analyzed the interaction of a dissipative two-level quantum system with high- and low-frequency excitation. The system is continuously and simultaneously irradiated by these two waves. If the frequency of the first signal is close to the level separation, the response of the system 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 system. The method can be useful for low-frequency Rabi spectroscopy in various physical systems which are described by a two-level Hamiltonian, such as nuclei spins in NMR, double-well quantum dots, superconducting flux and charge qubits, etc. As examples, the application of the method to a nuclear spin and to the readout of a flux qubit are briefly discussed.
03.65.Yz - Decoherence; open systems; quantum statistical methods.
85.35.Be - Quantum well devices(quantum dots, quantum wires, etc.).
85.35.Ds - Quantum interference devices.
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