Multimode mediated qubit-qubit coupling and dark-state symmetries in circuit quantum electrodynamics

Journal Article · Wed Jun 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.063827· OSTI ID:21550208

Filipp, S; Goeppl, M; Fink, J M; Baur, M; Bianchetti, R; Steffen, L; Wallraff, A ^[1]

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1. Department of Physics, ETH Zurich, CH-8093 Zurich (Switzerland)

Microwave cavities with high quality factors enable coherent coupling of distant quantum systems. Virtual photons lead to a transverse interaction between qubits when they are nonresonant with the cavity but resonant with each other. We experimentally investigate the inverse scaling of the interqubit 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, we observe dark states of the coupled qubit-qubit system and analyze their relation to the symmetry of the applied driving field at different frequencies.

• OSTI ID: 21550208
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSONS
CAVITIES
COUPLING
DIMENSIONLESS NUMBERS
ELECTRODYNAMICS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FIELD THEORIES
FREQUENCY MIXING
HARMONIC GENERATION
INFORMATION
INTERACTIONS
MASSLESS PARTICLES
MICROWAVE RADIATION
PHOTONS
QUALITY FACTOR
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
QUANTUM INFORMATION
QUBITS
RADIATIONS