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

  • YC.Zheng, Ching-Yi Lai, Todd A. Brun. (2018). Efficient Preparation of Large Block Code Ancilla States for Fault-tolerant Quantum Computation. Phys. Rev. A 97 032331
  • T.T. Chau, J.H. Hue, M. Trappe, B.-G. Englert. (2018). Systematic corrections to the Thomas-Fermi approximation without a gradient expansion. New J. Phys. 20 073003
  • S. Das, P. Liu, B. Gremaud, M. Mukherjee. (2018). Magnetic coherent population trapping in a single ion. Phys. Rev. A 97 033838
  • S. Safaei, B. Gremaud, R. Dumke, L.C. Kwek, L. Amico, C. Miniatura. (2018). Two-dimensional network of atomtronic qubits. Phys. Rev. A 97 042306
  • U. Bornheimer, Ivana Vasic, Walter Hofstetter. (2017). Phase transitions of the coherently coupled two-component Bose gas in a square optical lattice. Phys. Rev. A 96 063623
  • YC.Zheng, H.K. Ng. (2017). Digital quantum simulator in the presence of a bath. Phys. Rev. A 96 042329
  • M. Trappe, L.Y. Len, H.K. Ng, B.-G. Englert. (2017). Airy-averaged gradient corrections for two-dimensional fermion gases. Ann. Phys. 385 136
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