Periodic Reporting for period 2 - QNETWORK (Quantum networks wired by multi-spin entanglement)
Reporting period: 2019-11-01 to 2021-04-30
that are entangled lose their individual properties while their joint state is perfectly defined. Entanglement is
especially striking when the particles involved are spatially separated, resulting in non-local correlations and
rich phenomena like teleportation that go far beyond the realm of classical physics.At the same time, theoretical work is uncovering the exciting and unique possibilities of entanglement that is controllably shared between multiple nodes of a fundamentally new type of network: a quantum network.Realization of a quantum network would provide scientists with a unique new platform allowing both for novel fundamental studies of nature as well as for applications in quantum information processing, communication and metrology
My QNETWORK project will realize a multi-node entanglement-based quantum network. The network will
have fully controlled multi-spin nodes at individual diamond defects connected by single-photon links. Using
this quantum network I will demonstrate supremacy of a quantum repeater node over direct photon
transmission, generate multi-spin entanglement and study its decoherence, realize quantum teleportation
across multiple nodes and finally exploit the network for new scientific experiments. If successful, QNETWORK will yield a versatile multi-node quantum network that will serve as a novel platform for groundbreaking science and as a test-bed for a future quantum Internet.
Besides the technical work, we have formulated a vision on the future of quantum networks and classified different stages of development and their corresponding applications in an authoritative review.