MSGID: 1:317/3 63edb171   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Proposed quantum device may succinctly realize emergent particles such   
   as the Fibonacci anyon    
      
     Date:   
         February 15, 2023   
     Source:   
         Purdue University   
     Summary:   
         Tenacity has taken a roadblock and turned it into a possible route   
         to the development of quantum computing.   
      
      
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   FULL STORY   
   ==========================================================================   
   Long before Dr. Jukka Vayrynen was an assistant professor at the Purdue   
   Department of Physics and Astronomy, he was a post-doc investigating   
   a theoretical model with emergent particles in a condensed matter   
   setting. Once he arrived at Purdue, he intended to expand on the model,   
   expecting it to be relatively easy. He gave the seemingly straightforward   
   calculations to Guangjie Li, a graduate student working with Vayrynen,   
   but the calculations yielded an unexpected result. These results were a   
   surprising roadblock which nearly brought their research to a screeching   
   halt. Team tenacity has taken this roadblock and turned it into a possible   
   route to the development of quantum computing.   
      
      
   ==========================================================================   
   At the Aspen Center for Physics in Colorado, Vayrynen discussed this   
   issue with a colleague from the Weizmann Institute of Science in Israel,   
   Dr. Yuval Oreg, who helped circumvent the obstacle. The team used this   
   new understanding of their calculations to propose a quantum device   
   that could be tested experimentally to succinctly realize emergent   
   particles such as the Fibonacci anyon. They have published their findings,   
   "Multichannel topological Kondo effect," in Physical Review Letters on   
   February 10, 2023.   
      
   Condensed matter theory is a field of physics that studies, for example,   
   the properties of electronic quantum systems, with applications to   
   technologies such as superconductors, transistors, or quantum computing   
   devices. One of the challenges in this field is understanding the quantum   
   mechanical behavior of many electrons, also known as the "many-body   
   problem." It is a problem because it can only be theoretically modeled in   
   very limited cases. However, even in those limited cases, rich emergent   
   phenomena such as collective excitations or fractionally charged emergent   
   "quasi"-particles are known to emerge. These phenomena are a result of   
   the complex interactions between electrons and can lead to the development   
   of new materials and technologies.   
      
   "In our paper, we propose a quantum device that is simple enough to   
   be theoretically modeled and tested experimentally in the future,   
   yet also complex enough to display non-trivial emergent particles,"   
   says Vayrynen. "Our results indicate that the proposed device can   
   realize an emergent particle called a Fibonacci anyon that can be used   
   as a building block of a quantum computer. The device is therefore a   
   promising candidate for the development of quantum computing technology."   
   This discovery could be used in future quantum computers in a way that   
   allows one to make them more resistant to decoherence, a.k.a. noise.   
      
   According to their publication, the team introduced a physically motivated   
   N- channel generalization of a topological Kondo model. Starting from the   
   simplest case N = 2, they conjecture a stable intermediate coupling fixed   
   point and evaluate the resulting low-temperature impurity entropy. The   
   impurity entropy indicates that an emergent Fibonacci anyon can be   
   realized in the N = 2 model.   
      
   According to Li, "a Fibonacci anyon is an emergent particle with the   
   property that as you add more particles to the system, the number   
   of quantum states grows like the Fibonacci sequence, 1, 2, 3, 5, 8,   
   etc. In our system, a small quantum device is connected to conduction   
   electron leads which will overly screen the device and can result in an   
   emergent Fibonacci anyon."  The team also gives a number of predictions   
   that could be experimentally tested in future quantum devices.   
      
   "We evaluate the zero-temperature impurity entropy and conductance   
   to obtain experimentally observable signatures of our results. In the   
   large-N limit we evaluate the full cross over function describing the   
   temperature-dependent conductance," says Vayrynen.   
      
   This research is the first in a series that the Purdue team of Li and   
   Vayrynen will work on. They collaborated with a senior scientist from Max   
   Planck Institute for Solid State Research in Germany, Dr. Elio Ko"nig,   
   and posted a related work, "Topological Symplectic Kondo Effect," in a   
   preprint arXiv (2210.16614) on October 20, 2022.   
      
   This research was based on work supported by the Quantum Science Center,   
   a U.S.   
      
   Department of Energy National Quantum Information Science Research Center   
   headquartered at DOE's Oak Ridge National Laboratory. Dr. Yong Chen, the   
   Karl Lark-Horovitz Professor of Physics and Astronomy and Professor of   
   Electrical and Computer Engineering, is on the QSC's Governance Advisory   
   Board, and Purdue is one of the center's core partners.   
      
       * RELATED_TOPICS   
             o Matter_&_Energy   
                   # Quantum_Physics # Physics # Quantum_Computing #   
                   Spintronics   
             o Computers_&_Math   
                   # Quantum_Computers # Spintronics_Research #   
                   Computers_and_Internet # Hacking   
       * RELATED_TERMS   
             o Quantum_entanglement o Quantum_computer o   
             Computing_power_everywhere o Grid_computing o Quantum_number   
             o Computing o Quantum_tunnelling o Quantum_dot   
      
   ==========================================================================   
   Story Source: Materials provided by Purdue_University. Original written   
   by Cheryl Pierce.   
      
   Note: Content may be edited for style and length.   
      
      
   ==========================================================================   
   Journal Reference:   
      1. Guangjie Li, Yuval Oreg, Jukka I. Va"yrynen. Multichannel   
      Topological   
         Kondo Effect. Physical Review Letters, 2023; 130 (6) DOI: 10.1103/   
         PhysRevLett.130.066302   
   ==========================================================================   
      
   Link to news story:   
   https://www.sciencedaily.com/releases/2023/02/230215143640.htm   
      
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