Experimental realization of qubit-state-controlled directional edge states in waveguide QED
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916473337806848 |
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| author | Pakkiam, Prasanna Kumar, N. Pradeep Chiu, Chun-Ching Sommers, David Pletyukhov, Mikhail Fedorov, Arkady |
| author_facet | Pakkiam, Prasanna Kumar, N. Pradeep Chiu, Chun-Ching Sommers, David Pletyukhov, Mikhail Fedorov, Arkady |
| contents | We experimentally realise the theoretical proposal for in-situ tunable photonic edge states emerging from qubits coupled to a waveguide with a photonic bandgap. These edge states are directional, exhibiting theoretically zero population in the opposite direction. Our experiment implements a tunable Rice-Mele waveguide configuration, where the directionality of edge states is controlled in-situ by varying the qubit energy. The Rice-Mele waveguide is constructed using lumped resonators coupled to a standard Xmon qubit. We demonstrate the existence of these edge states both actively, via waveguide transmission, and passively, through qubit emission via an edge state. We estimate a 99.4% fidelity in the directionality, constrained by our measurement noise floor. These results hold significant promise for the development of long-range qubit couplers with effectively zero crosstalk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_05271 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental realization of qubit-state-controlled directional edge states in waveguide QED Pakkiam, Prasanna Kumar, N. Pradeep Chiu, Chun-Ching Sommers, David Pletyukhov, Mikhail Fedorov, Arkady Quantum Physics We experimentally realise the theoretical proposal for in-situ tunable photonic edge states emerging from qubits coupled to a waveguide with a photonic bandgap. These edge states are directional, exhibiting theoretically zero population in the opposite direction. Our experiment implements a tunable Rice-Mele waveguide configuration, where the directionality of edge states is controlled in-situ by varying the qubit energy. The Rice-Mele waveguide is constructed using lumped resonators coupled to a standard Xmon qubit. We demonstrate the existence of these edge states both actively, via waveguide transmission, and passively, through qubit emission via an edge state. We estimate a 99.4% fidelity in the directionality, constrained by our measurement noise floor. These results hold significant promise for the development of long-range qubit couplers with effectively zero crosstalk. |
| title | Experimental realization of qubit-state-controlled directional edge states in waveguide QED |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2411.05271 |