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Accueil > Événements > Actualités > Séminaire

Séminaire LPMMC

Luis Morales-Molina
Maximally entangled states, pair-superfluidity and MORE in a many-body interacting system
Lieu : Salle de lecture 2, maison des Magistères,
le jeudi 29 juin 2017 à 13h30
Personne à contacter : Dominique Spehner ()

In this talk I will present interesting results about the study of quantum correlations between two species of ultra-cold bosons living on a ring lattice. In the first part, I going to show that the presence of synthetic magnetic fields can lead to the formation of entangled states between pair of qudits (high dimensional qubits). Notably, maximally entangled eigenstates are possible to find for well-defined values of the Aharonov-Bohm phase of the synthetic magnetic field, which are zero-energy eigenstates of both the kinetic and interacting parts of the Bose-Hubbard Hamiltonian [1]. This latter property makes them exeptional and robust for applications. In the second part, I will focus on the eigenstates of the lowest-energy band in the regime of large interaction where a pair-superfluid phase naturally emerge for the ground state. In this scenario, the analysis of the interference pattern in the momentum distribution indicates a strong connection between entanglement and the pair- superfluid phase. This is further highlighted by the fact that for maximally entangled eigenstates any single order tunneling process is naturally suppressed [2]. Thus the observation of features of a pair-superfluid behavior can be used as a signature of the presence of entanglement. This might be an important tool for the characterization of the entanglement in the ground state. Finally, I will discuss the perspective of using this setting with two type of particles as a benchmark to investigate the connection between phase coherence and entanglement in many- body quantum systems.


  • [1] S. A. Reyes, L. Morales-Molina, M. Orszag, and D. Spehner, EPL 108, 20010 (2014).
  • [2] L. Morales-Molina, S. A. Reyes and E. Arevalo, EPL 115, 36004 (2016).