Multi-mode mediated exchange coupling in cavity QED

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 inte...

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Bibliographic Details
Published in:arXiv.org 2010-11
Main Authors: Filipp, S, Göppl, M, Fink, J M, Baur, M, Bianchetti, R, Steffen, L, Wallraff, A
Format: Article
Language:English
Subjects:
Coupling
Exchanging
Holes
Photons
Quantum electrodynamics
Quantum theory
Qubits (quantum computing)
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1011.3732