One photon simultaneously excites two atoms in a ultrastrongly coupled
light-matter system
- URL: http://arxiv.org/abs/2307.15437v2
- Date: Fri, 5 Jan 2024 03:10:25 GMT
- Title: One photon simultaneously excites two atoms in a ultrastrongly coupled
light-matter system
- Authors: Akiyoshi Tomonaga, Roberto Stassi, Hiroto Mukai, Franco Nori, Fumiki
Yoshihara, and Jaw-Shen Tsai
- Abstract summary: We experimentally investigate a superconducting circuit composed of two flux qubits ultrastrongly coupled to a common $LC$ resonator.
This enables novel processes for quantum-information processing tasks on a chip.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We experimentally investigate a superconducting circuit composed of two flux
qubits ultrastrongly coupled to a common $LC$ resonator. Owing to the large
anharmonicity of the flux qubits, the system can be correctly described by a
generalized Dicke Hamiltonian containing spin-spin interaction terms. In the
experimentally measured spectrum, an avoided level crossing provides evidence
of the exotic interaction that allows the \textit{simultaneous} excitation of
\textit{two} artificial atoms by absorbing \textit{one} photon from the
resonator. This multi-atom ultrastrongly coupled system opens the door to
studying nonlinear optics where the number of excitations is not conserved.
This enables novel processes for quantum-information processing tasks on a
chip.
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