2 research outputs found
Experimental Quantum Networking Protocols via Four-Qubit Hyperentangled Dicke States
We report the experimental demonstration of two quantum networking protocols,
namely quantum 1->3 telecloning and open-destination teleportation, implemented
using a four-qubit register whose state is encoded in a high-quality two-photon
hyperentangled Dicke state. The state resource is characterized using criteria
based on multipartite entanglement witnesses. We explore the characteristic
entanglement-sharing structure of a Dicke state by implementing high-fidelity
projections of the four-qubit resource onto lower-dimensional states. Our work
demonstrates for the first time the usefulness of Dicke states for quantum
information processing.Comment: 4 pages + Supplementary Information, 6 figures; revised version:
Accepted for publication in Phys. Rev. Let
Tomographic characterisation of correlations in a photonic tripartite state
Starting from a four-partite photonic hyper-entangled Dicke resource, we
report the full tomographic characterization of three-, two-, and one-qubit
states obtained by projecting out part of the computational register. The
reduced states thus obtained correspond to fidelities with the expected states
larger than 87%, therefore certifying the faithfulness of the
entanglement-sharing structure within the original four-qubit resource. The
high quality of the reduced three-qubit state allows for the experimental
verification of the Koashi-Winter relation for the monogamy of correlations
within a tripartite state. We show that, by exploiting the symmetries of the
three-qubit state obtained upon projection over the four-qubit Dicke resource,
such relation can be experimentally fully characterized using only 5
measurement settings. We highlight the limitations of such approach and sketch
an experimentally-oriented way to overcome them.Comment: 13 pages, 5 figure