Norbert Kalb

TL;DR: The data imply statistically significant rejection of the local-realist null hypothesis and could be used for testing less-conventional theories, and for implementing device-independent quantum-secure communication and randomness certification.

TL;DR: In this article, a single-photon entanglement protocol was proposed to achieve entangling fidelity of more than 0.5 at every clock cycle of about 100 milliseconds without any pre- or post-selection.

TL;DR: The development of a robust two-qubit gate that allows the linking of distant computational nodes is “a pressing challenge” and here it is demonstrated between the spin state of a single trapped atom and the polarization state of an optical photon contained in a faint laser pulse.

TL;DR: In this paper, entanglement distillation on a quantum network primitive of distant electron-nuclear two-qubit nodes is demonstrated through single-photon-mediated entangling of the electrons and robust storage in the nuclear spins.

TL;DR: A coherence time exceeding a second is realized for a single nitrogen-vacancy electron spin through decoupling sequences tailored to its microscopic nuclear-spin environment, providing a proof ofprinciple for quantum sensing of complex multi-spin systems and an opportunity for multi-qubit quantum registers with long coherence times.