Berge Englert Group

We are investigating questions that can be grouped into two categories: (1) quantum information proper and (2) cold atoms.

A central theme is the perennial question: What can we know about a quantum system? Specific problems under study concern complementarity and its immediate consequences, such as quantitative aspects of wave-particle duality; measurement schemes for quantum state tomography; the reconstructing of quantum states from noisy and incomplete measurements; as well as the robust encoding of quantum information for the purposes of storage and processing.

We are interested in ultracold dilute gases of neutral atoms, fermions and bosons, in two-dimensional and one-dimensional geometries, which will soon be ready for experimental studies at CQT and elsewhere. The problems under study include the band structure, transport properties, and finite-temperature effects of many-atom systems in periodic lattices, such as the graphene-type honeycomb lattice; strongly interacting systems of this kind; mixtures of fermions and bosons; existence and phenomenology of the FFLO phase in one- dimensional and two-dimensional systems; superfluidity and other phases with particular properties; and analogs of the Hall and spin-Hall effects.

Group Members

Recent papers

  • R. T. Scalettar, G. Batrouni, F. Hébert, Bo Xiao. (2019). Competition between Phase Separation and Spin Density Wave or Charge Density Wave Order: Role of Long-Range Interactions. Phys. Rev. B 99 205145
  • G. G. Batrouni, R. T. Scalettar, V. G. Rousseau, Bo Xiao, F. Hébert. (2019). One-dimensional Hubbard-Holstein model with finite range electron-phonon coupling. Phys. Rev. B 99 075108
  • R. T. Scalettar, G. G. Batrouni, N. C. Costa, W. -T. Chiu, Y. -X. Zhang. (2019). Charge Order in the Holstein Model on a Honeycomb Lattice. Phys. Rev. Lett. 122 077602
  • Richard T. Scalettar, G. G. Batrouni. (2019). Langevin Simulations of a Long Range Electron Phonon Model. Phys. Rev. B 99 035114
  • M. Trappe, Derek Y. H. Ho, Shaffique Adam. (2019). First-principles quantum corrections for carrier correlations in double-layer two-dimensional heterostructures. Phys. Rev. B 99 235415
  • J. Qi, H.K. Ng. (2019). Randomized benchmarking does not measure average infidelity of gates. Int. J. Quant. Info. 17 1950031
  • L.Y. Len, H.K. Ng. (2018). Open-System Quantum Error Correction. Phys. Rev. A 98 022037
more publications >

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