A quantum-network register assembled with optical tweezers in an optical cavity
Abstract
Quantum computation and quantum communication are expected to provide users with capabilities inaccessible by classical physics. However, scalability to larger systems with many qubits is challenging. One solution is to develop a quantum network consisting of small-scale quantum registers containing computation qubits that are reversibly interfaced to communication qubits. In this study, we report on a register that uses both optical tweezers and optical lattices to deterministically assemble a two-dimensional array of atoms in an optical cavity. Harnessing a single atom–addressing beam, we stimulate the emission of a photon from each atom and demonstrate multiplexed atom-photon entanglement with a generation-to-detection efficiency approaching 90%. Combined with cavity-mediated quantum logic, our approach provides a possible route to distributed quantum information processing. Editor’s summary Long-distance quantum networking requires the ability to entangle matter qubits, in which information is stored and manipulated locally, with photons that can then travel hundreds of kilometers to the next node. Entanglement between single trapped atoms or ions and photons is limited in scalability. Hartung et al. demonstrate the ability to load rubidium atoms into an optical lattice placed in an optical cavity. With the aid of optical tweezers and individual site addressability, they were able to load the lattice deterministically and entangle specific atoms with photons. The…
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