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

• URL: http://arxiv.org/abs/2404.18402v1
• Date: Mon, 29 Apr 2024 03:36:55 GMT
• Title: Entanglement enhancement of two giant atoms with multiple connection points in bidirectional-chiral quantum waveguide-QED system
• Authors: Jie Liu, Yue Cai, Kang-Jie Ma, Lei Tan, Wu-Ming Liu,
• Abstract summary: We study the entanglement generation of two giant atoms within a one-dimensional bidirectional-chiral waveguide quantum electrodynamics (QED) system. We find that entanglement can be controlled as needed by either adjusting the phase shift or selecting different configurations. Our scheme can be used for entanglement generation in chiral quantum networks of giant-atom waveguide-QED systems.
• Score: 5.2635935968082626
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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\rangle $. 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.

Related papers

• Entangling two giant atoms via a topological waveguide [1.2289361708127877]
  entanglement of two two-level giant atoms coupled to a photonic waveguide is studied. Quantum master equations are derived to govern the evolution of the two atoms. It is found that the two giant-atom entanglement depends on the coupling configurations and the coupling-point distance of the giant atoms.
  arXiv  Detail & Related papers  (2023-09-16T03:19:51Z)
• Generation of two-giant-atom entanglement in waveguide-QED systems [0.0]
  We study the generation of quantum entanglement between two giant atoms coupled to a one-dimensional waveguide. In particular, the maximal entanglement for the nested coupling is about one order of magnitude larger than those of separate and braided couplings. This work can be utilized for the generation and control of atomic entanglement in quantum networks based on giant-atom waveguide-QED systems.
  arXiv  Detail & Related papers  (2023-08-16T02:43:50Z)
• Giant-atom entanglement in waveguide-QED systems including non-Markovian effect [0.0]
  We study the generation of quantum entanglement between two giant atoms coupled to a common one-dimensional waveguide. Our results show that the generated entanglement depends on the phase shift, time delay, atomic initial state, and the coupling configuration. This work can be utilized for the generation and control of entanglement in quantum networks based on giant-atom waveguide-QED systems.
  arXiv  Detail & Related papers  (2023-03-26T14:56:52Z)
• Bound state of distant photons in waveguide quantum electrodynamics [137.6408511310322]
  Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. We predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Such states could be realized in the waveguide quantum electrodynamics platform.
  arXiv  Detail & Related papers  (2023-03-17T09:27:02Z)
• Non-Markovian disentanglement dynamics in double-giant-atom waveguide-QED systems [0.0]
  We study the disentanglement dynamics of two giant atoms coupled to a common one-dimensional waveguide. We find that the retardation-induced non-Markovianity leads to non-exponential decay and revivals of entanglement. This work will pave the way for the generation of stationary entanglement between two giant atoms.
  arXiv  Detail & Related papers  (2022-06-19T15:44:29Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Quantum chaos driven by long-range waveguide-mediated interactions [125.99533416395765]
  We study theoretically quantum states of a pair of photons interacting with a finite periodic array of two-level atoms in a waveguide. Our calculation reveals two-polariton eigenstates that have a highly irregular wave-function in real space.
  arXiv  Detail & Related papers  (2020-11-24T07:06:36Z)
• Tunable Chiral Bound States with Giant Atoms [7.602393730720086]
  We propose tunable chiral bound states in a system composed of superconducting giant atoms and a Josephson photonic-crystal waveguide (PCW) The chirality can be tuned by changing the atom-waveguide coupling or the external bias of the PCW. Our proposal is ready to be implemented in experiments with superconducting circuits, where it can be used as a tunable toolbox to realize topological phase transitions and quantum simulations.
  arXiv  Detail & Related papers  (2020-08-31T12:45:37Z)
• Waveguide quantum optomechanics: parity-time phase transitions in ultrastrong coupling regime [125.99533416395765]
  We show that the simplest set-up of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction. The combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (PT) symmetry. The $mathcalPT$ phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.
  arXiv  Detail & Related papers  (2020-07-04T11:02:20Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)
• Hyperentanglement in structured quantum light [50.591267188664666]
  Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes. We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
  arXiv  Detail & Related papers  (2020-06-02T18:00:04Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.