Siyuan Han

Professor
Primary office:
785-864-5831
2112 Interdisciplinary Science Building (CDS1) and 1077 Malott Hall


Summary

Professional Background

2003-present: Professor, University of Kansas
1997-2003: Associate Professor, University of Kansas
1993-1997: Research Associate Professor, Physics & Astronomy, SUNY at Stony Brook

Education

1986: Ph.D., Condensed Matter Physics, Iowa State University
1982: B.S., Physics, University of Science and Technology of China

Research

Quantum information science and technology, device physics and applications

  • Quantum information science, realization of quantum computation with solid state qubits, such as supercondting qubits based on Josephson junctions, and circuit QED.
  • Foundations of quantum mechanics. In particular, macroscopic quantum phenomena (e.g., Schrodinger's Cat).
  • Physics and applications of micro- and nano-scale devices.
  • Stochastic nonlinear dynamic systems.

The goal of our quantum computing project is to develop basic building blocks of a solid state quantum computer using superconducting quantum bits (qubits). In our case, a qubit is essentially a small ring of superconductor containing a Josephson junction. Electrical current in the ring flows without resistance (hence is called supercurrent) and in contrast to one's intuition the circulating current in the ring can flow in two opposite directions simultaneously - a direct consequence of quantum mechanics and one of the cornerstones of quantum computation. However, to maintain a qubit in such a quantum coherent state long enough for useful quantum computation is extremely difficult since interaction between the qubit and its electromagnetic environment can quickly destroy quantum coherence. Our objective is to identify and understand mechanisms of decoherence in superconducting qubits and to increase coherence time by optimizing qubit design, quantum gate implementation, control and readout circuits, material properties, and fabrication processes.

Memberships

  • Member, American Association for the Advancement of Science (AAAS)

Selected Publications

  • Chui-Ping Yang , Qi-Ping Su , Shi-Biao Zheng, and Siyuan Han, One-step transfer or exchange of arbitrary multipartite quantum states with a single-qubit coupler, Phys. Rev. B 92, 054509 (2015). [http://dx.doi.org/10.1103/PhysRevB.92.054509]
  • Guozhu Sun, Jiquan Zhai, Xueda Wen, Yang Yu, Lin Kang, Weiwei Xu, Jian Chen, Peiheng Wu, and Siyuan Han, Detection of small single-cycle signals by stochastic resonance using a bistable superconducting quantum interference device, Appl. Phys. Lett. 106, 172602 (2015). [http://dx.doi.org/10.1063/1.4919539]
  • Guozhu Sun, Xueda Wen, Ming Gong, Danwei Zhang, Yang Yu, Shiliang Zhu, Jian Chen, Peiheng Wu, and Siyuan Han, Observation of coherent oscillation in single-passage Landau-Zener transitions, Sci. Rep., 5, 8463 (2015). doi:10.1038/srep08463
  • G. M. Xue, Ming Gong, H. K. Xu,  W. Y. Liu,  H. Deng, Ye Tian, H. F. Yu, Yang Yu, D. N. Zheng, S. P. Zhao, and Siyuan Han, Observation of quantum stochastic synchronization in a dissipative quantum system,  Phys. Rev. B 90, 224505 (2014).
  • Xinsheng Tan, Dan-Wei Zhang, Zhentao Zhang, Yang Yu, Siyuan Han, and Shi-Liang Zhu, Demonstration of Geometric Landau-Zener Interferometry in a Superconducting Qubit, Phys. Rev. Lett. 112, 027001 (2014).
  • Chui-Ping Yang, Qi-Ping Su, Shi-Biao Zheng, and Siyuan Han, Generating entanglement between microwave photons and qubits in multiple cavities coupled by a superconducting qutrit, Phys. Rev. A 87, 022320 (2013).
  • Chui-Ping Yang, Qi-Ping Su, and Siyuan Han, Generation of Greenberger-Horne-Zeilinger entangled states of photons in multiple cavities via a superconducting qutrit or an atom through resonant interaction, Phys. Rev. A 86, 022329 (2012).
  • Guozhu Sun, Zhongyuan Zhou, Bo Mao, Xueda Wen, Peiheng Wu, and Siyuan Han, Entanglement dynamics of a phase qubit coupled to a two-level system, Phys. Rev. B 86, 064502 (2012).
  • Ye Tian, H. F. Yu, H. Deng, G. M. Xue, D. T. Liu, Y. F. Ren, G. H. Chen, D. N. Zheng, X. N. Jing, Li Lu, S. P. Zhao, and Siyuan Han, A cryogen-free dilution refrigerator based Josephson qubit measurement system, Rev. Sci. Inst. 83, 033907 (2012).

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Selected Awards & Honors

  • 1981: Guomoruo Award in Physics, USTC, China