The results appear in the paper, “Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime,” published in Nature Physics.
“We are enabling the investigation of light-matter interactions in a new domain in quantum optics,” said Pol Forn-Diaz, a postdoctoral fellow at IQC and lead author of the paper. “The possibilities are exciting because our circuit could potentially act as a quantum simulator to study other interesting quantum systems in nature.
The ultrastrong coupling between photons and qubits may lead to the exploration of new physics related to biological processes, exotic materials such as high-temperature superconductors, and even relativistic physics.
This illustration shows a qubit attached to a waveguide where light in the form of microwaves enters and exits.
“We measured a range of frequencies broader than the qubit frequency itself,” said Forn-Diaz. “This means there is a very strong interaction between the qubit and the photons. It is so strong that the qubit is seeing most of the photons that propagate in the circuit, which is a distinctive signature of ultrastrong coupling in an open system.”
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University of Waterloo
Citation: Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime http://dx.doi.org/10.1038/nphys3905