西安电子科技大学物理与光电工程学院导师教师师资介绍简介-施小锋

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本站小编 Free考研考试/2021-07-08

Research goal: Enjoying the beauty of HIS universe
The world we live in is very good, in that everything is so organized. When looking at items as small as atoms and electrons, the law ruling their dynamics is awesome. Our research aims at unveiling the unknown of the nature, the fascinating beauty of the quantum world.

Research Highlights
Fast, Accurate, and Realizable Two-Qubit Entangling Gates by Quantum Interference in Detuned Rabi Cycles of Rydberg Atoms
Xiao-Feng Shi
Phys. Rev. Applied 11, 044035 (2019) – Published 11 April 2019
Ultracold neutral atoms offer a promising route toward scalable quantum computing—a route that is unfortunately hindered by Doppler dephasing, a major stumbling block that spoils the fidelity of entangling gates. This study uses a theory based on quantum interference to show that it is possible to significantly suppress Doppler dephasing, allowing a high-fidelity entangling gate even with present-day technology. The interference-induced entanglement described here not only lays a foundation for such neutral-atom gates, but also sheds light on quantum information science involving other physical systems.

Accurate Quantum Logic Gates by Spin Echo in Rydberg Atoms
Xiao-Feng Shi
Phys. Rev. Applied 10, 034006 (2018) – Published 5 September 2018
Implementation of accurate quantum gates based on Rydberg interactions is required for scalable quantum computing with ultracold neutral atoms, but has been held back by the difficulty of realizing high-fidelity two-qubit Rydberg gates. This study proposes an easily realizable controlled-Z gate of high intrinsic fidelity, based on spin echo in Rydberg atoms. The ability to attain an accurate entangling Rydberg gate, with neither pulse shaping nor atomic vibrational-ground-state cooling, makes ultracold atoms promising for large-scale quantum computing.

Deutsch, Toffoli, and cnot Gates via Rydberg Blockade of Neutral Atoms
Xiao-Feng Shi
Phys. Rev. Applied 9, 051001 (2018) – Published 22 May 2018
Using only Deutsch gates, one could construct a quantum circuit to accomplish any feasible quantum computation, but unfortunately a working Deutsch gate has remained out of reach, due to lack of a protocol. This study proposes an easily realizable Deutsch-gate protocol, based on the blockade interactions in e.g. neutral Rydberg atoms. This protocol can be extended to realize the CNOT gate, as well as the Toffoli gate, which can be used in quantum error correction. Given the very broad applicability of these gates, this result is a significant advance in quantum information science.

Rydberg Quantum Gates Free from Blockade Error
Xiao-Feng Shi
Phys. Rev. Applied 7, 064017 (2017) – Published 12 June 2017
Rapid, accurate quantum gates are needed for an efficient quantum computer. Among the various physical platforms for logic gates, neutral atoms excited to high-lying states have met with much attention, but have been fundamentally limited by the gate protocol based on the well-known “blocking” method. Using a Rydberg interaction to tailor a generalized Rabi oscillation frequency, this study presents a class of exceedingly rapid and accurate two-bit quantum-gate protocols, with implications for quantum control across a wide range of platforms featuring two-body interactions.

Research Interests
Quantum control in neutral atom systems and solid state systems.
Quantum information processing with atoms and solid state systems.
Rydberg interactions of alkali-metal atoms.
Quantum many-body physics.
Topological quantum physics.
Quantum simulation.
Biological physics and physical biology.

Publications
(For full text of recent papers, please visit HERE）
16. Xiao-Feng Shi.
Transition Slow-Down by Rydberg Interaction of Neutral Atoms and a Fast Controlled-NOT Quantum Gate.
Phys. Rev. Applied 14, 054058 (2020).
15. Xiao-Feng Shi.
Single-site Rydberg addressing in 3D atomic arrays for quantum computing with neutral atoms.
J. Phys. B 53, 054002 (2020).
14. Xiao-Feng Shi.
Suppressing Motional Dephasing of Ground-Rydberg Transition for High-Fidelity Quantum Control with Neutral Atoms.
Phys. Rev. Applied 13, 024008 (2020).
13. Xiao-Feng Shi.
Fast, Accurate, and Realizable Two-Qubit Entangling Gates by Quantum Interference in Detuned Rabi Cycles of Rydberg Atoms.
Phys. Rev. Applied 11, 044035 (2019).
12. Xiao-Feng Shi.
Accurate Quantum Logic Gates by Spin Echo in Rydberg Atoms.
Phys. Rev. Applied 10, 034006 (2018).
11. Xiao-Feng Shi.
Deutsch, Toffoli, and CNOT Gates via Rydberg Blockade of Neutral Atoms.
Phys. Rev. Applied 9, 051001 (2018).
10. Xiao-Feng Shi and T. A. B. Kennedy.
Simulating magnetic fields in Rydberg-dressed neutral atoms.
Phys. Rev. A 7, 97 033414 (2018).
9. Xiao-Feng Shi.
Universal Barenco quantum gates via a tunable noncollinear interaction.
Phys. Rev. A 7, 97 032310 (2018).
8. Xiao-Feng Shi.
Rydberg Quantum Gates Free from Blockade Error.
Phys. Rev. Applied 7, 064017 (2017).
7. Xiao-Feng Shi and T. A. B. Kennedy.
Annulled van der Waals interaction and fast Rydberg quantum gates.
Phys. Rev. A 95, 043429 (2017).
6. Xiao-Feng Shi, P. Svetlichnyy, and T. A. B. Kennedy.
Spin–charge separation of dark-state polaritons in a Rydberg medium.
J. Phys. B 49, 074005 (2016).
Highlighted in: Special Issue on Rydberg atom physics
5. Xiao-Feng Shi, F. Bariani, and T. A. B. Kennedy.
Entanglement of neutral-atom chains by spin-exchange Rydberg interaction.
Phys. Rev. A 90, 062327 (2014).
4. Xiao-Feng Shi.
Nuclear spin polarization in a single quantum dot pumped by two laser beams.
Phys. Rev. B 87, 195318 (2013).
3. Xiao-Feng Shi, Yan Chen, and J. Q. You.
Exotic phase diagram of a topological quantum system.
Phys. Rev. B 82, 174412 (2010).
2. J. Q. You, Xiao-Feng Shi, Xuedong Hu, and Franco Nori.
Quantum emulation of a spin system with topologically protected ground states using superconducting quantum circuits.
Phys. Rev. B 81, 014505 (2010).
1. Xiao-Feng Shi, Yue Yu, J. Q. You, and Franco Nori.
Topological quantum phase transition in the extended Kitaev spin model.
Phys. Rev. B. 79, 134431 (2009).
Collaboration on biophysics:
3. Yan Lu, Xiao-Feng Shi, Phuong H. Nguyen, Fabio Sterpone, Freddie R. Salsbury, Jr., and Philippe Derreumaux.
Amyloid-β(29–42) Dimeric Conformations in Membranes Rich in Omega-3 and Omega-6 Polyunsaturated Fatty Acids.
The Journal of Physical Chemistry B 2019, 123 (12), 2687-2696.
2. Yan Lu, Xiao-Feng Shi,Freddie R. Salsbury Jr., and Philippe Derreumaux.
Influence of electric field on the amyloid-β(29-42) peptides embedded in a membrane bilayer.
J. Chem. Phys. 148, 045105 (2018).
1. Yan Lu, Xiao-Feng Shi,Freddie R. Salsbury Jr., and Philippe Derreumaux.
Small static electric field strength promotes aggregation-prone structures in amyloid-β(29-42).
J. Chem. Phys. 146, 145101 (2017).

People
Xiao-Feng Shi
PhD., Fudan, 2011.
Visiting student, RIKEN, 2009, 2010.
Postdoc. UCSD, GaTech, 2011-2016.

Openings
Undergraduates who are interested in physics are welcome to join our group. It will be our pleasure to help you about how to read scientific literatures and write high-level manuscripts for publication in well-known academic journals. Those who are interested in joining in as graduate students are most welcome. You can choose to study either quantum information or biophysics (the latter is relatively simple and those with basic skills on coding can do well).

Xiaofeng Shi
xiao_feng_shi@163.com