Journal
SCIENCE
Volume 342, Issue 6165, Pages 1494-1496Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1244324
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Funding
- Canadian Institute for Advanced Research
- Natural Sciences and Engineering Research Council of Canada
- Alberta Innovates Technology Futures
- ETH Zurich
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Photon-mediated interactions between atoms are of fundamental importance in quantum optics, quantum simulations, and quantum information processing. The exchange of real and virtual photons between atoms gives rise to nontrivial interactions, the strength of which decreases rapidly with distance in three dimensions. Here, we use two superconducting qubits in an open one-dimensional transmission line to study much stronger photon-mediated interactions. Making use of the possibility to tune these qubits by more than a quarter of their transition frequency, we observe both coherent exchange interactions at an effective separation of 3 lambda/4 and the creation of super-and subradiant states at a separation of one photon wavelength lambda. In this system, collective atom-photon interactions and applications in quantum communication may be explored.
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