Chirality, Nonreciprocity and Symmetries for a Giant Atom

• URL: http://arxiv.org/abs/2502.08156v1
• Date: Wed, 12 Feb 2025 06:48:40 GMT
• Title: Chirality, Nonreciprocity and Symmetries for a Giant Atom
• Authors: Luting Xu, Lingzhen Guo,
• Abstract summary: Chiral and nonreciprocal quantum devices are crucial for signal routing and processing in a quantum network. We study the chirality and nonreciprocity of a giant atom coupled to a one-dimensional waveguide.
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• Abstract: Chiral and nonreciprocal quantum devices are crucial for signal routing and processing in a quantum network. In this work, we study the chirality and nonreciprocity of a giant atom coupled to a one-dimensional waveguide. We clarify that the chiral emission of the giant atom is not directly related to the time-reversal symmetry breaking but to the mirror-symmetry breaking. We propose a passive scheme to realize the chiral emission of a giant atom without breaking time-reversal symmetry by extending the legs of the giant atom. We find the time-reversal symmetry breaking via nonuniform coupling phases is artificial and thus cannot result in nonreciprocal single-photon scattering for the giant atom. The nonreciprocity of the giant atom can be obtained by the external dissipation of the giant atom that truly breaks the time-reversal symmetry. Our work clarifies the roles of symmetries in the chirality and nonreciprocity of giant-atom systems and paves the way for the design of on-chip functional devices with superconducting giant atoms.

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