I am currently an Associate Researcher at the Institute for Interdisciplinary Information Science (IIIS), Tsinghua University. I received my PhD in Physics from Peking University in 2005, where I was trained in the 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.
My research group focuses on the research in hybrid superconducting qubit and mesoscopic investigation of transport phenomena in quantum systems. We conduct experiments to control quantum behavior at the level of single spins with the potential for fundamental breakthroughs and possible application to quantum computing.
Current Research Projects:
(1) Hybrid transmon qubit based on superconductor-semiconductor junctions
Recent advances in nanowire growth technologies have enabled the development of superconductor-semiconductor structures with a coherent charge transport, which makes it possible to implement superconducting quantum circuits based on Semiconductor nanowire-Superconductor tunnel junctions. The Josephson energy of a single junction can be readily tuned by the field effect of carrier density in the semiconductor nanowire. We are going to build microwave circuits operating in the quantum regime to investigate the physics of hybrid superconductor-semiconductor structures. This hybrid microwave quantum circuits also offers a way to study Andreev and Majorana bound states in NW Josephson junctions.
（2）Hybrid spin-superconducting qubit system
Magnetic interactions are more desirable in circuit QED, since long coherence times are mainly achieved in the system where spin states are used to store the information. However, the coupling of one individual spin to a superconducting circuit is usually too weak for quantum information applications. We explore a hybrid spin-superconducting qubit system, consisting of a superconducting qubit magnetically coupled to the electron spins of nitrogen vacancy centers (NVs) in diamond. The theoretically predicted strong coupling between a superconducting qubit and a single NV center makes the system an attractive building block for quantum information processing. This hybrid system offers a way to investigate the strong coupling of distant centers and the information transfer between superconducting qubits and electron spins in NVs.
（3）Graphene quantum dots for quantum computing
Our research focuses on the mesoscopic investigation of transport phenomena, particularly electrical properties of two-dimentional graphene materials. Due to extraordinary electronic properties and long coherence times, graphene is one of the most promising materials for quantum computers. We fabricate graphene quantum dot (QD) devices for controlling quantum behaviour at the level of single spins with the potential for fundamental breakthroughs and possible application to quantum computing.
1.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., Published online, DOI: 10.1021/acs.nanolett.6b02522
2.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); (* Co-first Author)
3.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); (* Co-first Author)
4.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)
5.Y.P.Song and B.Golding, Manipulation and decoherence of acceptor states in silicon, Europhysics Lett., 95, 47004 (2011)
6.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)
7.Y.P.Song, A.L.Schmitt, and S.Jin, Ultralong single-crystal metallic Ni2Si nanowires with low resistivity, Nano Lett., 7, 965 (2007)
8.Y.P.Song, and S.Jin, Synthesis and Properties of Single-Crystal Ni3Si nanowires, Appl. Phys. Lett., 90, 173122 (2007)
9.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)
10.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)
11.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)
12.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)
13.Y.P.Song and H.Xu, Direct current hopping conductivity in one-dimensional nanometer systems, Chin.Phys. Lett, 20,277 (2003)
14.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)
15.Z.M.Liao, J.Xu and Y.P.Song, Quantum interference effect in single Pt(Ga)/C nanowire, Appl. Phys. Lett., 87,182112 (2005)
16.X.H.Zhang,Y.Zhang,Y.P.Song, and D.P.Yu, Synthesis and photoluminescence properties of ZnS-ZnO nanobelts with hierarchically organized structures, Physica E, 28, 1 (2005)
17.H.Xu, Y.P.Song and X.M.Li, Hopping conductivity studies on one-dimensional disordered systems, Acta.Phys, 51, 143 (2002) (in Chinese)
18.H.Xu and Y.P.Song, Study of AC hopping conductivity on one-dimensional nanometer systems, Chin.Phys., 11, 1294 (2002)
19.H.Xu and Y.P.Song, AC Hopping conductivity studies on one-dimensional disordered systems, Acta.Phys, 51, 1798 (2002) (in Chinese)
20.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)
21.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)
22.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)