Yipu Song
Research Fellow
Institute for Interdisciplinary Information Sciences

Address: Mengminwei Building S309, Tsinghua University, Beijing, China, 100084
Tel: 8610-62773713

   I am currently a research fellow at the Institute for Interdisciplinary Information Science (IIIS), Tsinghua University. I received my Ph.D. in Physics from Peking University in 2005, where I was trained in nanofabrication and transport measurement in the electron microscopy laboratory. I was a post-doc from 2006-2007 at the University of Wisconsin-Madison, where I worked on spintronics nanodevices. In 2007, I moved to Michigan State University as a research associate, focusing on an experimental approach to acceptor-based quantum computing. From 2009 to 2012, I worked as a postdoctoral research fellow at the Institute for Quantum Computing, University of Waterloo, where my research was focused on single-electron devices for spin-based quantum information processing.

Research Interests:

    My research focuses on superconducting qubit and mesoscopic investigation of transport phenomena in quantum systems for quantum computing.

Current  Research Projects:

(1)   Scalable superconducting qubit system

   We have proposed a new architecture of scalable superconducting qubits based on ring network structures. All transmon qubits inside the ring are coupled to a superconducting coplanar waveguide (CPW) resonator. The entanglement of qubits inside the ring can be accomplished by the cavity-mediated cross-resonance (CR) gate. The coupling between two qubits in the two adjacent rings can be achieved via the shared transmon qubit, which serves as a flux-tunable transmon bus. This architecture design of superconducting qubits can efficiently avoid breakpoints of superconducting patterns, and significantly improve the robustness of intraconnections of qubits. Our protocol can accomplish simultaneous readout and entanglement generation in all transmon qubits inside the ring network structure. This particular architecture also has an advantage of flexibility to define fault tolerant logical qubits. Our goal is to implement a fault-tolerant operating scheme with multiple transmon qubits, which supports reliable logical qubits and universal gates.

(2)Hybrid superconducting system

   Based on our proposed hybrid superconducting qubit system, we plan to investigate an experimental approach to directly couple a transmon qubit to an individual spin in the nitrogen-vacancy (NV) center. Our simulation result indicate that, the coupling rate between the transmon and NV spin can be three orders of magnitude larger than that for a single spin coupling to a microwave cavity, which can be used to make a transmon bus, leading to coherent virtual exchange interaction among different single spins. By using a low-density NV spin ensemble, we will study the SWAP operation between the transmon and the NV spin ensemble, and achieve a quantum non-demolition measurement on the state of NV ensemble. Our experiment scheme can accomplish state exchange between the processor (transmon) and the memory (NV spin ensemble) through direct coupling between them with a much larger coupling rate without using of a cavity as the inter-media. This experiment scheme is feasible with the experimental technology because all estimated parameters are based on typical experimental values.


1. X. Y. Han*, T. Q. Cai*, X. G. Li, Y. K. Wu, Y.W.Ma, Y. L. Ma, J. H. Wang, H. Y. Zhang, Y. P. Song, and L. M. Duan, Error analysis in suppression of unwanted qubit interactions for a parametric gate in a tunable superconducting circuit, Phys. Rev. A, 102, 022619 (2020).

2. X. Li§, T. Cai§, H. Yan, Z. Wang, X. Pan , Y. Ma, W. Cai, J. Han, Z. Hua , X. Han, Y. Wu, H. Zhang, H. Wang, Yipu Song*, Luming Duan, and Luyan Sun, Tunable Coupler for Realizing a Controlled-Phase Gate with Dynamically Decoupled Regime in a Superconducting Circuit,  Phys. Rev. Appl., 14, 024070 (2020).

3. Y. Xu, Z. Hua, T. Chen, X. Pan, X. Li, J. Han, W. Cai, Y. Ma, H. Wang, Y. P. Song, Z.-Y. Xue*, and L. Sun*, Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit, Phys. Rev. Lett. 124, 230503 (2020).

4. Cheng Ma, Zhiling Wang, Yukai Wu, Zenghui Bao, Yipu Song, Hongyi Zhang*, and Luming Duan*, Four-spin cross relaxation in a hybrid quantum device, Phys. Rev. A 100, 012322 (2019).

5. W. Cai, J. Han, Feng Mei*, Y. Xu, Y. Ma, X. Li, H. Wang, Y. P. Song, Zheng-Yuan Xue, Zhang-qi Yin, Suotang Jia, and Luyan Sun*, Observation of Topological Magnon Insulator States in a Superconducting Circuit, Phys. Rev. Lett. 123, 080501 (2019)

6. Y.L. Ma, T.Q. Cai, X.Y. Han, Y.W. Hu, H.Y. Zhang, H.Y. Wang, L.Y. Sun, Y.P. Song*, and L.M. Duan*, Andreev bound states in a few-electron quantum dot coupled to superconductors, Phys. Rev.B, 99, 035413 (2019).

7. Y.P. Song*, Y.W. Hu, Quantum interference in InAs/InAlAs core-shell nanowires, Appl. Phys. Lett., 113,143104 (2018).

8. X.LiY. MaJ. HanTao ChenY. XuW. CaiH. WangY. P. SongZ.Y. Xue*, Z.Q.Yin*, L.Y. Sun*, Perfect remote quantum state transfer in a superconducting qubit chain with parametrically tunable couplings, Phys. Rev. Appl., 10, 054009 (2018).                                

9. L.HuY.W. MaW.Z. CaiX.H. MuY. XuW.T. WangY.K. WuH.Y. WangY.P. Song, C.L. Zou*, S. M. GirvinL.M. DuanL.Y. Sun*, Quantum error correction and universal gate set operation on a binomial bosonic logical qubit, Nature Phys., 15, 503 (2019).     

10. L.HuS.H. WuW.Z. CaiY.W.MaX.H. MuY. XuH.Y. WangY.P. SongD.L. Deng*, C.L. Zou*, L.Y. Sun*, Quantum generative adversarial learning in a superconducting quantum circuit, Science Advances, 5, eaav2761 (2019).  

11. L.HuX.H.MuW.Z. CaiY.W. MaY. XuH.Y. WangY.P. SongC.L. Zou*, L.Y. Sun*, Experimental repetitive quantum channel simulation, Science Bulletin, 63, 1551 (2018).

12. Y.Xu, W.Z. Cai, Y.W. Ma, X.H. Mu, W. Dai, W.T. Wang, L. Hu, X.G. Li, J.X. Han, H.Y. Wang, Y.P. Song, Z.B. Yang*, S.B. Zheng*, L.Y. Sun*, Geometrically manipulating photonic Schrodinger cat states and realizing cavity phase gates, arXiv:1810.04690 [quant-ph].                                                                                                       

13. L. Hu, Y.C. Ma, Y. Xu, W.T. Wang, Y.W. Ma, K. Liu, H.Y. Wang, Y.P. Song, M.H. Yung*, L.Y. Sun*, Simulating molecular spectroscopy with circuit quantum electrodynamics, Science Bulletin, 63, 293 (2018).

14.Y. Xu, W. Cai, Y. Ma, X. Mu, L. Hu, Tao Chen, H. Wang, Y. P. Song, Zheng-Yuan Xue*, Zhang-qi Yin, and L. Sun, Single-Loop Realization of Arbitrary Nonadiabatic Holonomic Single-Qubit Quantum Gates in a Superconducting Circuit, Phys. Rev. Lett., 121, 110501 (2018).

15.Y.W. Hu, Y.P. Song*, and L.M. Duan*, Quantum interface between a transmon qubit and spins of nitrogen-vacancy centers, Phys. Rev. A 96, 062301 (2017).

16. H.N. Xiong, W.T. Jiang, Y.P. Song and L.M. Duan*, Bound state properties of ABC-stacked trilayer graphene quantum dots, J. Phys. Condens Matter., 29, 215002 (2017).

17. Y.W. Hu, C.T. JiX.X WangJ.R. HuoQ. Liu, Y.P. Song*, The structural, magnetic and optical properties of TMn@(ZnO)42 (TM = Fe, Co and Ni) hetero-nanostructure, Scientific Reports 7, 16485 (2017).

18. W. Wang, L. Hu, Y. Xu, K. Liu, Y. Ma, S-B. Zheng*, R. Vijay, Y. P. Song, L.M. Duan*, and L.Y.Sun*, Converting quasiclassical states into arbitrary Fock state superpositions in a superconducting circuit, Phys. Rev. Lett., 118, 223604 (2017).

19. Y.P. Song*, H.N. Xiong, W.T. Jiang, H.Y. Zhang, X. Xue, C. Ma, Y.L. Ma, L.Y. Sun, H.Y. Wang, and L.M. Duan*, Coulomb oscillations in a gate-controlled few-layer graphene quantum dot, Nano Lett., 16, 6245 (2016).

20. K. Liu, Y. Xu, W. Wang, Shi-Biao Zheng, Tanay Roy, Suman Kundu, Madhavi Chand, A. Ranadive, R. Vijay, Y. P. Song, L.M. Duan* and L.Y. Sun*, A two-fold quantum delayed-choice experiment enabled by a which-path detector, Science Advances, 3, e1603159  (2017).

21. G.W. Holloway*, Y.P. Song*, C.M. Haapamaki, R.R. LaPierre, and J. Baugh, Electron transport in InAs-InAlAs core-shell nanowires, Appl. Phys. Lett., 102, 043115 (2013).    

22. N. Gupta*, Y.P. Song*, C.M. Haapamaki, U. Sinha, R.R. LaPierre and J. Baugh, Temperature dependent electron mobility in InAs nanowires, Nanotechnology, 24, 225202 (2013). 

23. G.W. Holloway, Y.P. Song, C.M. Haapamaki, R.R. LaPierre, and J. Baugh*, Trapped charge dynamics in InAs nanowires, J. Appl. Phys., 113, 024511 (2013).

24. Y.P.Song* and B.Golding, Manipulation and decoherence of acceptor states in silicon, Europhysics Lett., 95, 47004 (2011).

25. Y.P.Song, A.L.Schmitt, and S.Jin*, Spin-dependent tunneling transport into CrO2 nanorod devices with nonmagnetic contacts, Nano Lett., 8, 2356 (2008).

26. Y.P.Song, A.L.Schmitt, and S.Jin*, Ultralong single-crystal metallic Ni2Si nanowires with low resistivity, Nano Lett., 7, 965 (2007).

27. Y.P.Song, and S.Jin*, Synthesis and Properties of Single-Crystal Ni3Si nanowires, Appl. Phys. Lett., 90, 173122 (2007).

28. Y.P.Song, H.Z.Zhang, C.Lin, Y.W. Zhu, G.H.Li, F.H.Yang, and D.P.Yu*, Luminescence emission originating from nitrogen doping of Ga2O3 nanowires, Phys.Rev.B, 69, 075304 (2004).

29. Y.P.Song, P.W.Wang, H.Q.Lin, G.S.Tian, J.Lu, Z.Wang,Y.Zhang, and D. P. Yu*, Physical origin of the ferromagnetic ordering above room temperature in GaMnN nanowires, Journal of Physics: Condensed Matter, 17, 5073 (2005).

30. Y.P.Song, P.W.Wang, X.H.Zhang, J.Xu, G.H.Li, and D.P.Yu*, Magnetism and luminescence evolution due to nitrogen doping in manganese-gallium oxide nanowires, Phys.Lett.A, 351,302 (2006).

31.Y.P.Song, P.W.Wang, X.Y.XU, R.M.Wang, Z.Wang, G.H.Li, and D.P.Yu*, Magnetism and photoluminescence in manganese-gallium oxide nanowires with monoclinic and spinel structures, Physica E, 31,67 (2006).

32. Y.P.Song* and H.Xu, Direct current hopping conductivity in one-dimensional nanometer systems, Chin.Phys. Lett, 20,277 (2003).

33. P.W. Wang, Y.P.Song, X.Z. Zhang and D.P.Yu*, Transformation from beta-Ga2O3 to GaN nanowires via nitridation, Chin.Phys. Lett, 25,1038 (2008).

34. Z.M.Liao, J.Xu and Y.P.Song, Y. Zhang, Y.J.Xing, and D.P.Yu*, Quantum interference effect in single Pt(Ga)/C nanowire, Appl. Phys. Lett., 87,182112 (2005).

35. X.H.Zhang,Y.Zhang,Y.P.Song, and D.P.Yu*, Optical properties of ZnS nanowires synthesized via simple physical evaporation, Physica E, 28, 1 (2005).

36. H.Xu*, Y.P.Song and X.M.Li, Hopping conductivity studies on one-dimensional disordered systems, Acta.Phys, 51, 143 (2002) (in Chinese).

37. H.Xu* and Y.P.Song, Study of AC hopping conductivity on one-dimensional nanometer systems, Chin.Phys., 11, 1294 (2002).

38. H.Xu* and Y.P.Song, AC Hopping conductivity studies on one-dimensional disordered systems, Acta.Phys, 51, 1798 (2002) (in Chinese).

39. H.Xu*, Y.P.Song and X.M.Li, Conduction mechanism studies on electron transfer of disordered system, Journal of Central South University, 9,134(2002).

40. H.Xu*, Y.P.Song and Y.F.Li, The electronic structure of one-dimension nanometer system, Journal of Central South University, 33,107(2002) (in Chinese).

41. S.Jin, A.L.Schmitt, and Y.P.Song, Metal silicide nanowires and methods for their production, United States Patent, Patent No.: US 7,803,707 B2 (2010).

Research funding:

1. Grant funding from the Natural Science Foundation of China under Grant No.11874235, 2018.

2. Grant funding from the State's Key Project of Research and Development Plan under Grant No.2016YFA0301902, 2016.