Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity

Details Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity

2005-11-24

arxiv.org/abs/cond-mat/0511592v2

Phys. Rev. B 73, 125336 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 5 figures. v2: minor additions and minor numerical error in Eq. (32) corrected

Scientific paper

10.1103/PhysRevB.73.125336

We study a model for a pair of qubits which interact with a single off-resonant cavity mode and, in addition, exhibit a direct inter-qubit coupling. Possible realizations for such a system include coupled superconducting qubits in a line resonator as well as exciton states or electron spin states of quantum dots in a cavity. The emergent dynamical phenomena are strongly dependent on the relative energy scales of the inter-qubit coupling strength, the coupling strength between qubits and cavity mode, and the cavity mode detuning. We show that the cavity mode dispersion enables a measurement of the state of the coupled-qubit system in the perturbative regime. We discuss the effect of the direct inter-qubit interaction on a cavity-mediated two-qubit gate. Further, we show that for asymmetric coupling of the two qubits to the cavity, the direct inter-qubit coupling can be controlled optically via the ac Stark effect.

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