Work

Qubit-oscillator dynamics in the dispersive regime: Analytical theory beyond the rotating-wave approximation

Year: 2009

Type: article

Abstract: We generalize the dispersive theory of the Jaynes-Cummings model beyond the frequently employed rotating-wave approximation (RWA) in the coupling between the two-level system and the resonator. For a detuning sufficiently larger than the qubit-oscillator coupling, we diagonalize the non-RWA Hamiltonian and discuss the differences to the known RWA results. Our results extend the regime in which dispersive qubit readout is possible. If several qubits are coupled to one resonator, an effective qubit-qubit interaction of Ising type emerges, whereas RWA leads to isotropic $XY$ interaction. This impacts on the entanglement characteristics of the qubits.

Source: Physical Review A

DOI: 10.1103/physreva.80.033846

Authors: David Zueco, Georg M. Reuther, Sigmund Kohler, Peter Hänggi

Institutions: University of Augsburg, Consejo Superior de Investigaciones Científicas, Instituto de Ciencia de Materiales de Madrid

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Deutsche Forschungsgemeinschaft

Awards: G1061299197, G1116235337