Multi-mode mediated exchange coupling in cavity QED

Details Multi-mode mediated exchange coupling in cavity QED Multi-mode mediated exchange coupling in cavity QED

2010-11-16

arxiv.org/abs/1011.3732v1

Phys. Rev. A 83, 063827 (2011)

Physics

Quantum Physics

9 pages, 6 figures

Scientific paper

10.1103/PhysRevA.83.063827

Microwave cavities with high quality factors enable coherent coupling of distant quantum systems. Virtual photons lead to a transverse exchange interaction between qubits, when they are non-resonant with the cavity but resonant with each other. We experimentally probe the inverse scaling of the inter-qubit coupling with the detuning from a cavity mode and its proportionality to the qubit-cavity interaction strength. We demonstrate that the enhanced coupling at higher frequencies is mediated by multiple higher-harmonic cavity modes. Moreover, in the case of resonant qubits, the symmetry properties of the system lead to an allowed two-photon transition to the doubly excited qubit state and the formation of a dark state.

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