Decoherence-Free Qubit and Chiral Emission from a Giant Molecule in Waveguide QED
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866911550680334336 |
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| author | Wang, Yang García-Ripoll, Juan José Santos, Alan C. |
| author_facet | Wang, Yang García-Ripoll, Juan José Santos, Alan C. |
| contents | Combining decoherence protection with directional photon emission in a single waveguide quantum electrodynamics (QED) device remains an open challenge. Here we show that an artificial giant molecule -- strongly interacting artificial atoms coupled to a photonic waveguide at multiple spatially separated points -- achieves both: a fully operational decoherence-free (DF) qubit and state-dependent chiral single-photon emission, arising from the same photon-interference mechanism. Initialization reduces to a local excitation of a single atom, universal single-qubit gates are implemented by modulating a single atomic frequency, and readout exploits state-dependent chiral emission with directionality reaching 100% and low measurement error of 1.2%. The coexistence of decoherence protection and directional emission in a single device positions giant molecules as protected chiral nodes for modular quantum networks in waveguide QED. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27443 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Decoherence-Free Qubit and Chiral Emission from a Giant Molecule in Waveguide QED Wang, Yang García-Ripoll, Juan José Santos, Alan C. Quantum Physics Combining decoherence protection with directional photon emission in a single waveguide quantum electrodynamics (QED) device remains an open challenge. Here we show that an artificial giant molecule -- strongly interacting artificial atoms coupled to a photonic waveguide at multiple spatially separated points -- achieves both: a fully operational decoherence-free (DF) qubit and state-dependent chiral single-photon emission, arising from the same photon-interference mechanism. Initialization reduces to a local excitation of a single atom, universal single-qubit gates are implemented by modulating a single atomic frequency, and readout exploits state-dependent chiral emission with directionality reaching 100% and low measurement error of 1.2%. The coexistence of decoherence protection and directional emission in a single device positions giant molecules as protected chiral nodes for modular quantum networks in waveguide QED. |
| title | Decoherence-Free Qubit and Chiral Emission from a Giant Molecule in Waveguide QED |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.27443 |