Phase controlled single photon transport in giant atoms coupling to one-dimensional waveguide

doi:10.1088/1674-1056/ade8df

Abstract The phase-controlled single-photon transport properties of a giant atom coupled to a one-dimensional waveguide are investigated. The coupling between the giant atom and the waveguide is modeled as a multi-point interaction. The coupling strengths between the giant atom and the waveguide are represented as complex numbers with associated phases. Analytical expressions for the scattering amplitudes are obtained using the real-space Hamiltonian method. The results show that the characteristics of the scattering spectra, including the positions of peaks (or dips) and the full width at half maximum, can be tuned by adjusting the phase difference between the coupling strengths. Further calculations reveal that the scattering spectra can be either super-broadened or sub-broadened. The conditions for achieving perfect nonreciprocal single-photon transport in the Markovian regime are also discussed. Moreover, we demonstrate the control of single-photon transport through phase differences in the non-Markovian regime. Our results may find applications in the design of quantum devices operating at the single-photon level, based on waveguide quantum electrodynamics.

Keywords: giant atom waveguide nonreciprocal single photon scattering

Received: 06 April 2025
Revised: 04 June 2025
Accepted manuscript online: 27 June 2025

PACS:	42.50.Nn	(Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)
	42.50.Ct	(Quantum description of interaction of light and matter; related experiments)
	32.70.Jz	(Line shapes, widths, and shifts)

Fund: This work is supported by the National Natural Science Foundation of China (Grant Nos. 12475010 and 119075023), the Major Project of the Natural Science Foundation of Anhui Provincial Department of Education (Grant No. 2022AH040053), and the Key Natural Scientific Research Projects of Universities in Anhui Province (Grant Nos. 2023AH051078 and 2023AH051125).

Corresponding Authors: Mu-Tian Cheng
E-mail: mtcheng@ahut.edu.cn

Cite this article:

Yan-Yan Song(宋艳艳), Yao Zang(臧耀), Yunning Lu(路云宁), Zhao Liu(刘兆), Xiao-San Ma(马小三), and Mu-Tian Cheng(程木田) Phase controlled single photon transport in giant atoms coupling to one-dimensional waveguide 2025 Chin. Phys. B 34 124206

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