Multipartite entanglement generation and dynamics of three giant atoms coupling to a one-dimensional waveguide

Ma, Xiao San; Quan, Jia-Hong; Lu, Yun-Ning; Cheng, Mu-Tian

doi:10.1007/s11128-023-04215-7

Cited by 4 publications

(1 citation statement)

References 50 publications

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“…In contrast to a conventional small atom with point-like dipole approximation, the scale of the giant atoms becomes comparable to the wavelength of the light and thus the dipole approximation is broken. In the giant atom community, the quantum interference effect via the multiple coupling points brings out a variety of striking novel phenomena not existent in traditional small atoms, such as frequency-dependent decay rate and Lamb shift [21,22], unconventional bound states [23][24][25][26][27], decoherence-free interaction [12,[28][29][30], non-Markovian decay dynamics [31][32][33], chiral light-matter interation [34][35][36][37][38][39], phase-controlled frequency conversions [8], and entanglement generation or disentanglement [40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Phase-modulated single-photon router and chiral scattering between two waveguides coupled by a giant three-level atom

Zhou,

Zhu,

Zhang

et al. 2024

Laser Phys. Lett.

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We investigate a T-shaped single-photon router constructed by two waveguides connected via a giant Λ-type three-level atom. Under a real-space approach, the analytical expressions of the single-photon transmission and reflection amplitudes are obtained. It is shown that a high transfer-rate routing between two waveguides can be effectively achieved by modulating the phase difference, the accumulated phase and the atom-waveguide coupling strengths, and its frequencies can be tuned with a classical driving field. Interestingly, chiral scattering and a single-photon targeted router with direction selectivity have been realized by the ideally equivalent atom-waveguide interaction. We believe that our results have potential applications in constructing optical quantum devices and designing the single-photon quantum routing using the giant-atom setup.

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Section: Introductionmentioning

confidence: 99%

Phase-modulated single-photon router and chiral scattering between two waveguides coupled by a giant three-level atom

Zhou,

Zhu,

Zhang

et al. 2024

Laser Phys. Lett.

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Entanglement enhancement of two giant atoms with multiple connection points in bidirectional-chiral quantum waveguide-QED system

Liu,

Cai,

et al. 2024

Phys. Scr.

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We study the entanglement generation of two giant atoms within a one-dimensional bidirectional-chiral waveguide quantum electrodynamics (QED) system, where the initial state of the two giant atoms are ∣e a , g b 〉. Here, each giant atom is coupled to the waveguide through three connection points, with the configurations divided into five types based on the arrangement of coupling points between the giant atoms and the waveguide: separate, fully braided, partially braided, fully nested, and partially nested. We explore the entanglement generation process within each configuration in both nonchiral and chiral coupling cases. It is demonstrated that entanglement can be controlled as needed by either adjusting the phase shift or selecting different configurations. For nonchiral coupling, the entanglement of each configuration exhibits steady state properties attributable to the presence of dark state. In addition, we find that steady-state entanglement can be obtained at more phase shifts in certain configurations by increasing the number of coupling points between the giant atoms and the bidirectional waveguide. In the case of chiral coupling, the entanglement is maximally enhanced compared to the one of nonchiral case. Especially in fully braided configuration, the concurrence reaches its peak value 1, which is robust to chirality. We further show the influence of atomic initial states on the evolution of interatomic entanglement. Our scheme can be used for entanglement generation in chiral quantum networks of giant-atom waveguide-QED systems, with potential applications in quantum networks and quantum communications.

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Phase-mediated single-photon scattering and nonreciprocal transmission in a coupled resonator waveguide with a three-level giant atom

Chen,

Zhu,

Zhang

et al. 2024

Laser Phys. Lett.

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We theoretically investigate single-photon scattering and nonreciprocal transmission in a coupled resonator waveguide which is coupled to a driven three-level giant atom via two distant sites. In our system, the local coupling phases are introduced to induce intriguing interference effects. As a result, the phase difference can serve as a sensitive controller for the photon scattering. It is found that the photon scattering properties can be effectively tailored by the size of the giant atom, the driving field and the phase difference. Intriguingly, by carefully tuning the parameters such as the atomic dissipation and the phase difference, a perfect nonreciprocal single-photon transmission can be realized. Additionally, the photon frequency can be adjusted by modulating Rabi frequency of the driving field. These results have significant potential for the development of nonreciprocal optical devices using the giant-atom configuration.

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Multipartite entanglement generation and dynamics of three giant atoms coupling to a one-dimensional waveguide

Cited by 4 publications

References 50 publications

Phase-modulated single-photon router and chiral scattering between two waveguides coupled by a giant three-level atom

Phase-modulated single-photon router and chiral scattering between two waveguides coupled by a giant three-level atom

Entanglement enhancement of two giant atoms with multiple connection points in bidirectional-chiral quantum waveguide-QED system

Phase-mediated single-photon scattering and nonreciprocal transmission in a coupled resonator waveguide with a three-level giant atom

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