12 Jul 2024 | Lukas Hartung, Matthias Seubert, Stephan Welte, Emanuele Distante, and Gerhard Rempe
This paper reports on the development of a quantum network register using optical tweezers and optical lattices in an optical cavity. The authors demonstrate a deterministic assembly of a two-dimensional array of atoms, enabling multiplexed atom-photon entanglement with a generation-to-detection efficiency approaching 90%. The approach combines cavity quantum electrodynamics with atom-based technologies, allowing for individual control of atomic qubits and their coupling to photonic channels. The experimental setup involves using laser beams to address and manipulate atoms, which are initially trapped in a magneto-optical trap and then transferred to a two-dimensional optical lattice. The fidelity of the generated atom-photon entanglement remains constant for up to six atoms, indicating scalability. The efficiency of the photon emission process decreases for atoms displaced from the center of the cavity, but the overall efficiency can be increased through multiplexing schemes, achieving a probability of detecting at least one entangled pair that approaches unity. This work paves the way for distributed quantum information processing and secure communication in quantum networks.This paper reports on the development of a quantum network register using optical tweezers and optical lattices in an optical cavity. The authors demonstrate a deterministic assembly of a two-dimensional array of atoms, enabling multiplexed atom-photon entanglement with a generation-to-detection efficiency approaching 90%. The approach combines cavity quantum electrodynamics with atom-based technologies, allowing for individual control of atomic qubits and their coupling to photonic channels. The experimental setup involves using laser beams to address and manipulate atoms, which are initially trapped in a magneto-optical trap and then transferred to a two-dimensional optical lattice. The fidelity of the generated atom-photon entanglement remains constant for up to six atoms, indicating scalability. The efficiency of the photon emission process decreases for atoms displaced from the center of the cavity, but the overall efficiency can be increased through multiplexing schemes, achieving a probability of detecting at least one entangled pair that approaches unity. This work paves the way for distributed quantum information processing and secure communication in quantum networks.