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

  • M. Trappe, Ryan A. Chisholm. A mechanistic density functional theory for ecology across scales.
  • M. Trappe, Hue Jun Hao Alexander, B.-G. Englert. Density-potential functional theory for fermions in one dimension.
  • M. Trappe, Piotr T. Grochowski, Jun Hao Hue, Tomasz Karpiuk, Kazimierz Rzążewski. Phase Transitions of Repulsive Two-Component Fermi Gases in Two Dimensions.
  • Gu Yanwu, Rajesh Mishra, B.-G. Englert, H.K. Ng. Randomized linear gate set tomography.
  • Yiping Lu, J.Y.Sim, Jun Suzuki, B.-G. Englert, H.K. Ng. (2020). Direct estimation of minimum gate fidelity. Phys. Rev. A 102 022410
  • Jun Hao Hue, Ege Eren, Shao Hen Chiew, Jonathan Wei Zhong Lau, Leo Chang, Thanh Tri Chau, M. Trappe, B.-G. Englert. (2020). Fourth-order leapfrog algorithms for numerical time evolution of classical and quantum systems.
  • B. Gremaud, G. Batrouni. (2020). Pairing and pair superfluid density in one-dimensional Hubbard models.
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