Qiang Li

Stony Brook University

"Quantum Computing with Chiral Fermions"

 

Qiang Li graduated from University of Science and Technology of China (Hefei) in 1986, then came to US on the CUSPEA (China-U.S. Physics Examination and Application) program under direction of Prof. T. D. Lee, a Nobel laureate. He received his PhD in Iowa State University in 1991, then joined the Condensed Matter Physics and Materials Science Department at Brookhaven National Laboratory (BNL), where he leads the chiral and superconducting materials program, funded by DOE, Office of Basic Energy Sciences, and others. His research interests range from basic physics and material sciences of superconductors, thermoelectrics, and topological quantum materials to their applications in energy and quantum information technology. In the fall of 2020, he joined Stony Brook University as a SUNY Empire Innovation Professor in the Department of Physics and Astronomy, and continues to hold a joint scientist appointment at BNL as the Advanced Energy Materials Group Leader.

“Quantum Computing with Chiral Fermions”

Recently, we proposed to utilize chiral anomaly1 for the designs of qubits potentially capable of operating at THz frequency and at room temperature. The proposed chiral qubit2 is based on chiral materials, such as Dirac/Weyl semimetals, with the ├ |0⟩ and ├ |1⟩  states corresponding to the superpositions of dissipation-free left-handed and right-handed currents carried by chiral fermions.  In this lecture, I will describe the properties of Dirac and Weyl semimetals and the associated topological phase transitions, conceptual designs of chiral qubits, and our recent theoretical and experimental investigations into several topological control principles driven by quantum coherence.3-5

References:

1. Q. Li et al Nature Physics 12 (6), 550-554 (2016)
2. D. Kharzeev and Q. Li, US Patent #10,657,456 (2020); arXiv:1903.07133
3. C Vaswani, et al Physical Review X 10, 021013 (2020)
4. L. Luo et al Nature Materials 20, 329 (2021)
5. N. Aryal et al Physical Review Letters 126, 016401(2021)