Focus Research Group 3

FRG 3 - Quantum Information Processing

Focus Research Group 3 will utilize Bose-Einstein condensates for the implementation of quantum emulation and quantum computation, which have applications in fundamental problems of strongly correlated, many-body physics and can potentially allow quantum computation above the ultra-low temperature regime that limits current platforms.

Researchers

  • Jonathan Wrubel, Creighton Physics (group leader)
  • Jeremy Armstrong, UNK Physics
  • Wei Bao, UNL ECE
  • Wai-Ning Mei, UNO Physics
  • Renat Sabirianov, UNO Physics
  • Thomas Wong, Creighton Physics
  • Aleksander Wysocki, UNK Physics

Research Thrust 1:

Quantum Emulation

Bose Einstein condensates (BECs) are ideal platforms for working out the consequences of a wide variety of ideal quantum Hamiltonians. This kind of quantum emulation uses the BEC to simulate phases or physics relevant to other more complicated systems that cannot be calculated easily with digital computers. BECs are powerful tools for quantum emulation because they form effectively zero-temperature quantum materials with perfect coherence. These complex quantum systems will be explored experimentally in ultracold atoms and in exciton-polaritons, as well as explored theoretically.

Sketch of the energies of the radio-frequency Feshbach resonance in 41K.
Fig.: Sketch of the energies of the radio-frequency Feshbach resonance in 41K.

Research Thrust 2:

Quantum Computation

Quantum computers are known to outperform classical computers at a variety of tasks, including breaking public-key cryptographic systems, searching databases, and finding approximate solutions to optimization problems. Governments across the world have recognized quantum computing's potential for ushering a technological revolution by passing strategic legislation funding for its research and development. In the U.S., the National Quantum Initiative Act was passed by Congress in December 2018 and quickly signed into law. In this thrust, FRG 3 proposes to investigate quantum algorithms based on quantum walks and a new qubit based on crosswire quantum dots.

Figure (a) Schematic diagram of crossed wire configuration of a qubit. Two crosswire QDs are coupled through a bridge of distance d. The ground state (left) and first excited state (right) have even-odd parity. The energy separation between these states is controlled by the width of the crosswire and the size of the bridge d. Figure (b) Schematic representation of energies of the two-level-atom-like system coupled to the 1D waveguide characterized by decay rate (Γ1D) and waveguide mode wavenumber (k1D).
Fig.: (a) Schematic diagram of crossed wire configuration of a qubit. Two crosswire QDs are coupled through a bridge of distance d. The ground state (left) and first excited state (right) have even-odd parity. The energy separation between these states is controlled by the width of the crosswire and the size of the bridge d. (b) Schematic representation of energies of the two-level-atom-like system coupled to the 1D waveguide characterized by decay rate (Γ1D) and waveguide mode wavenumber (k1D).

FRG-3 Selected Publications

  • Renjie Tao, Kai Peng, Louis Haeberlé, Quanwei Li, Dafei Jin, Graham R. Fleming, Stéphane Kéna-Cohen, Xiang Zhang, Wei Bao. (2022) Halide perovskites enable polaritonic XY spin Hamiltonian at room temperature. Nature Materials 21 716-766
  • Kai Peng, Renjie Tao, Louis Haeberlé, Quanwei Li, Dafei Jin, Graham R. Fleming, Stéphane Kéna-Cohen, Xiang Zhang, Wei Bao. (2022) Room-temperature polariton quantum fluids in halide perovskites. Nature Communications 13 7388
  • Ghellab, T. and Baaziz, H. and Charifi, Z. and Telfah, M. and Alsaad, A. and Telfah, A. and Hergenröder, R. and Sabirianov, R. (2022). The structural, electronic, optical, thermodynamical and thermoelectric properties of the BiAlSe compound for solar photovoltaic semiconductors.  Materials Science in Semiconductor Processing. 141  (C) 106415. doi.org/10.1016/j.mssp.2021.106415 
  • Ghellab, T. and Baaziz, H. and Charifi, Z. and Latelli, H. and Ahmad, Mais Jamil and Telfah, Mahmoud and Alsaad, Ahmad and Telfah, Ahmad and Hergenröder, Roland and Sabirianov, Renat. (2022). First-principles calculations of the high-pressure behavior, electronic, magnetic, and elastic properties of praseodymium pnictides: PrX (X = P, As and Bi).  Journal of Magnetism and Magnetic Materials. 546  (C) doi.org/10.1016/j.jmmm.2021.168919
  • Bian, Mengying and Zhu, Liang and Wang, Xiao and Choi, Junho and Chopdekar, Rajesh V. and Wei, Sichen and Wu, Lishu and Huai, Chang and Marga, Austin and Yang, Qishuo and Li, Yuguang C. and Yao, Fei and Yu, Ting and Crooker, Scott A. and Cheng, Xuemei M. and Sabirianov, Renat F. and Zhang, Shengbai and Lin, Junhao and Hou, Yanglong and Zeng, Hao. (2022). Dative Epitaxy of Commensurate Monocrystalline Covalent van der Waals Moiré Supercrystal.  Advanced Materials. 34  (17) Article No. 2200117. doi.org/10.1002/adma.202200117