Portraying entanglement between molecular qubits with four-dimensional inelastic neutron scattering

E. Garlatti, T. Guidi, S. Ansbro, P. Santini, G. Amoretti, J. Ollivier, H. Mutka, G. Timco, I. J. Vitorica-Yrezabal, G. F. S. Whitehead, R. E. P. Winpenny and S. Carretta ()
Additional contact information
E. Garlatti: Fisiche ed Informatiche, Università di Parma
T. Guidi: ISIS facility, Rutherford Appleton Laboratory
S. Ansbro: Institut Laue-Langevin
P. Santini: Fisiche ed Informatiche, Università di Parma
G. Amoretti: Fisiche ed Informatiche, Università di Parma
J. Ollivier: Institut Laue-Langevin
H. Mutka: Institut Laue-Langevin
G. Timco: School of Chemistry and Photon Science Institute, The University of Manchester
I. J. Vitorica-Yrezabal: School of Chemistry and Photon Science Institute, The University of Manchester
G. F. S. Whitehead: School of Chemistry and Photon Science Institute, The University of Manchester
R. E. P. Winpenny: School of Chemistry and Photon Science Institute, The University of Manchester
S. Carretta: Fisiche ed Informatiche, Università di Parma

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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)2 supramolecular 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.

Date: 2017
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DOI: 10.1038/ncomms14543

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