清华大学交叉信息研究院

祖充
Email:
地址: Center for Quantum Information,Tsinghua University, Beijing, P. R. China
电话: 86-10-62798050-1203


Homepage: iiis.tsinghua.edu.cn/~chongzu 

Short Bio:


  I am currently a fifth-year Ph.D. student in Center for Quantum Information, IIIS, Tsinghua University (under the supervision of Prof. L.-M. Duan), where I work on experimental quantum information processing (QIP). I received my Bachelor's Degree from Department of Physics, Tsinghua University, in 2011.
 



Current Research:


 

My research interests lie in experimental quantum information processing (QIP) with photons and Nitrogen-vacancy (NV) center in diamond.

1. QIP with photons
    We experimentally generate polarization entangled photon pair through spontaneous parametric down-conversion (SPDC) with either femtosecond pulsed laser or continous-wave (CW) laser. High-fidelity and efficient two-photon entanglement and four-photon entanglement are achieved in our lab. With this technique, we have demonstrated several QIP protocols and tested the foundation of quantum mechanics. 
 




See our recent results on QIP with photons
    Demonstration of quantum game theory New Journal of Physics, 14, 033002, 2012 (see also the accompaning story on phys.org)
    State-independent test of quantum contextuality with a single photon Physical Review Letters, 109, 150401 (2012) (see also the accompanying Physics Viewpoint)   
    Experimental distillation of quantum nonlocality Physical Review Letters, 111, 050405 (2013)
    Observation of entanglement duality with indentical particals New Journal of Physics, 16:083011 (2014)   
    Experimental demonstration of a quantum router Sci. Rep. 5, 12452 (2015)
 
2. Nitrogen-vacancy (NV) center in diamond
    NV center in diamond can be treated as an "ion" trapped in the diamond lattice. Unlike conventional trapped ion (atom) system which requires high vacuum and ultralow temperature (laser cooling, sideband cooling, etc), an electron spin triplet ground state (S=1) of NV can be polarized, coherently manipulated and detected in room temperature. Together with hyperfine-coupled proximal Carbon-13 and Nitrogen-14 (15) nuclear spins, NV center in diamond acts as a promising platform for large scale quantum computing in room temperature.
    We experimentally adress a NV electron spin in type IIa synthetic diamond crystal by building up a confocal microscopy. A 532nm laser is used to polarize and detect the electron spin state (a qubit). Microwave (MW) and radiofrequency (RF) signals are delivered through a coplanar waveguide (CPW), achieving fast electron and nuclear spin manipulation respectively.
 


 

See our most recent result on QIP with NV center in room temperature
    Realization of universal geometric quantum gates Nature 514, 72 (2014).
    Memory-built-in quantum cloning 
Sci. Rep. 5, 12203 (2015)

    Most recently, my main project is trying to put NV center into liquid-helium environment (4K), with both an open-cycle cryostat (Oxford) and a close-cycle cryostation (Montana). In low temperature, phonons will be suppressed, leading to better T1 and T2 for electron and nuclear spins, as well as resonant laser excitation between ground and excited states. Moreover, In order to enhance fluorescence collection efficiency in low temperature, we fabricate solid-immersion lens (SIL) on diamond surface.


 

 


Awards:


 

Tsinghua Special Scholarship 2014 (¥15000, Highest honor for graduate students in Tsinghua, 10 graduates each year)
National Scholarship for Graduate Students (2014) (¥30000)

Nomination for 清华大学学术新秀 2013 (I don't know the exact translation for this...)
National Scholarship for Graduate Students (2012) (¥20000)
Microsoft Research Asia (MSRA) Fellowship Award (2012)
 ($10000, ten PhD candidates over the Asia Pacific zone each year)

 

 


Publications: 


 

According to Google scholar, my papers have more than 60 citations, with an h-index of 4.

8. X.-X. Yuan, J.-J. Ma, P.-Y. Hou, X.-Y. Chang, C. Zu, L.-M. Duan. Experimental demonstration of a quantum router. Sci. Rep. 5, 12452 (2015).

7. W.-B. Wang*, C. Zu* (Co-first author), L. He, W.-G. Zhang, L.-M. Duan. Memory-built-in quantum cloning in a hybrid solid-state spin register. Sci. Rep. 5, 12203 (2015).


6. C. Zu, W.-B. Wang, L. He, W.-G. Zhang, C.-Y. Dai, F. Wang, L.-M. Duan. Experimental realization of unversal geometric quantum gates with solid-state spins. Nature 514, 72 (2014)

5. J.-J. Ma, X.-X. Yuan, C. Zu, X.-Y. Chang, P.-Y. Hou, L.-M. Duan. Experimental observation of entanglement duality for identical particles. New Journal of Physics, 16:083011 (2014)  

4. C. Zu, D.-L. Deng, P.-Y. Hou, X.-Y. Chang, F. Wang, L.-M. Duan. Experimental distillation of quantum nonlocality. Physical Review Letters, 111, 050405 (2013). Preprint:  arXiv: 1305.4212

3. C. Zu, Y.-X. Wang, D.-L. Deng, X.-Y. Chang, K. Liu, P.-Y. Hou, H.-X. Yang, L.-M. Duan. Reply to Comment “State-independent experimental test of quantum contextuality in an indivisible system. Physics Review Letters, 110, 078902 (2013). Preprint: arXiv: 1302.0619

2. C. Zu, Y.-X. Wang, D.-L. Deng, X.-Y. Chang, K. Liu, P.-Y. Hou, H.-X. Yang, L.-M. Duan. State-independent experimental test of quantum contextuality in an indivisible system. Physical Review Letters, 109, 150401 (2012) (Editor's suggestion, see also the accompanying Physics Viewpoint). preprint: arXiv: 1207.0059

1. C. Zu, Y.-X. Wang, X.-Y. Chang, Z.-H. Wei, S.-Y. Zhang, L.-M. Duan. Experimental demonstration of quantum gain in a zero-sum game. New Journal of Physics, 14, 033002, 2012  (Selected for inclusion in IOP Select,  see also the accompanying story on phys.org)


Preprints: 


 

3. D.-L. Deng, C. Zu, X.-Y. Chang, P.-Y. Hou, H.-X. Yang, Y.-X. Wang, L.-M. Duan. Exploring Quantum Contextuality to Generate True Random Numbers. arXiv: 1301.5364

2. C. Zu, Y.-X. Wang, X.-Y. Chang,  P.-Y. Hou, H.-X. Yang, L.-M. Duan. Experimental realization of an entanglement filter through the environmental selection. arXiv: 1208.0907

1. X.-Y. Chang, Y.-X. Wang, C. Zu, K. Liu, L.-M. Duan. Experimental demonstration of an entanglement-based quantum router. arXiv: 1207.7265


  Presentation:


 

7. Quantum information processing with photons and hybrid solid-spin system. June 30th, 2015. Zhejiang University, Hangzhou, China

6. Quantum information processing with photons and hybrid solid-spin system. December 9th, 2014. Jinan Institute of Quantum Technology, Jinan, China

5. Experimental distillation of quantum nonlocality. 44th Annual DAMOP Meeting. June 3-7, 2013 • Quebec City, Quebec, Canada. Poster section.

4. State-independent experimental test of quantum contextuality in an indivisible system. 44th Annual DAMOP Meeting. June 3-7, 2013 • Quebec City, Quebec, Canada. Oral presentation.

3. State-independent experimental test of quantum contextuality in an indivisible system. International Conference on Quantum Foundation and Technology: Frontier and Future (ICQFT'2012), Poster Section, August 25-30, 2012, Dunhuang, China.

2. Entangled photon source: preparation and application in CQI. Research talk at the quantum summer shcool series on "Frontiers of Quantum Information Science", August 20-24, 2012, Tsinghua University, Beijing, China.

1. Experimental demonstration of quantum gain in a zero-sum game. 43rd APS Division of Atomic, Molecular and Optical Physics (DAMOP 2012), June 4-8, 2012 • Anaheim, California, USA. Oral presentation.