title: Portraying entanglement between molecular qubits with four-dimensional inelastic neutron scattering.
abstract: Entanglement is a crucial resource for quantum information processing and its detection and quantification is of paramount importance in many areas of current research. Weakly coupled molecular nanomagnets provide an ideal test bed for investigating entanglement between complex spin systems. However, entanglement in these systems has only been experimentally demonstrated rather indirectly by macroscopic techniques or by fitting trial model Hamiltonians to experimental data. Here we show that four-dimensional inelastic neutron scattering enables us to portray entanglement in weakly coupled molecular qubits and to quantify it. We exploit a prototype (Cr7Ni)2supramolecular dimer as a benchmark to demonstrate the potential of this approach, which allows one to extract the concurrence in eigenstates of a dimer of molecular qubits without diagonalizing its full Hamiltonian.
authors.affiliation: Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, I-43124 Parma, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Garlatti
authors.affiliation: ISIS facility, Rutherford Appleton Laboratory, OX11 0QX Didcot, UK.
authors.forename: T
authors.initials: T
authors.lastname: Guidi
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, Grenoble Cedex 9 F-38042, France.|School of Chemistry and Photon Science Institute, The University of Manchester, M13 9PL Manchester, UK.
authors.forename: S
authors.initials: S
authors.lastname: Ansbro
authors.affiliation: Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, I-43124 Parma, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Santini
authors.affiliation: Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, I-43124 Parma, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Amoretti
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, Grenoble Cedex 9 F-38042, France.
authors.forename: J
authors.initials: J
authors.lastname: Ollivier
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, Grenoble Cedex 9 F-38042, France.
authors.forename: H
authors.initials: H
authors.lastname: Mutka
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, M13 9PL Manchester, UK.
authors.forename: G
authors.initials: G
authors.lastname: Timco
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, M13 9PL Manchester, UK.
authors.forename: I J
authors.initials: IJ
authors.lastname: Vitorica-Yrezabal
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, M13 9PL Manchester, UK.
authors.forename: G F S
authors.initials: GF
authors.lastname: Whitehead
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, M13 9PL Manchester, UK.
authors.forename: R E P
authors.initials: RE
authors.lastname: Winpenny
authors.affiliation: Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, I-43124 Parma, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Carretta