Related papers: Topological photon pairs in a superconducting quantum metamaterial

Topological photon pairs in a superconducting quantum metamaterial

URL: http://arxiv.org/abs/2006.12794v1
Date: Tue, 23 Jun 2020 07:04:27 GMT
Title: Topological photon pairs in a superconducting quantum metamaterial
Authors: Ilya S. Besedin, Maxim A. Gorlach, Nikolay N. Abramov, Ivan Tsitsilin, Ilya N. Moskalenko, Alina A. Dobronosova, Dmitry O. Moskalev, Alexey R. Matanin, Nikita S. Smirnov, Ilya A. Rodionov, Alexander N. Poddubny, Alexey V. Ustinov
Abstract summary: We use an array of superconducting qubits to engineer a nontrivial quantum metamaterial. By performing microwave spectroscopy of the fabricated array, we experimentally observe the spectrum of elementary excitations. We find not only the single-photon topological states but also the bands of exotic bound photon pairs arising due to the inherent anharmonicity of qubits.
Score: 44.62475518267084
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Recent discoveries in topological physics hold a promise for disorder-robust quantum systems and technologies. Topological states provide the crucial ingredient of such systems featuring increased robustness to disorder and imperfections. Here, we use an array of superconducting qubits to engineer a one-dimensional topologically nontrivial quantum metamaterial. By performing microwave spectroscopy of the fabricated array, we experimentally observe the spectrum of elementary excitations. We find not only the single-photon topological states but also the bands of exotic bound photon pairs arising due to the inherent anharmonicity of qubits. Furthermore, we detect the signatures of the two-photon bound edge-localized state which hints towards interaction-induced localization in our system. Our work demonstrates an experimental implementation of the topological model with attractive photon-photon interaction in a quantum metamaterial.

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