General

CAI Qingyu 
Email: qycai@wipm.ac.cn
Telephone: 027-87197739
Address: West 30, Xiaohongshan, Chinese Academy of Science, Pinbiaolou, Wuhan, Hubei, China 
Postcode: 430071

Research Areas

Quantum cryptography theory;

Black hole and information;

Quantum cosmology.

Education

Ph.D

Honors & Distinctions

First Award of Gravity Research Foundation (2013);

Daneil Tsui Fellowship og Hong Kong University (2014);

Distinguished Scholar of National Natural Science Foundation of China (2017).


Publications


Representative work
  1. ​Dongshan He, Dongfeng Gao, and Qing-yu Cai, Spontaneous creation of the universe from nothing. Phys. Rev. D 89, 083510 (2014)

  2. Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan and Li You,Information conservation is fundamental: Recovering the lost information in Hawking radiation. IJMPD, 22, 1341014 (2013). First prize in the 2013 Essay Competition of the Gravity Research Foundation.

  3. Hua Lu, Chi-Hang Fred Fung, Xiongfeng Ma, Qing-yu Cai, Unconditional security proof of a deterministic quantum key distribution with a two-way quantum channel,Phys. Rev. A 84, 042344 (2011).


Full publication list

  1. Dongshan He and Qing-yu Cai, Wheeler-DeWitt equation rejects quantum effects of grown-up universes as a candidate for dark energy.  Phys. Lett. B 809, 135747 (2020).

  2. Minghao Wang and Qing-yu Cai, Duplicating classical bits with universal quantum cloning machine. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 62, 030312 (2019).

  3. Minghao Wang and Qing-yu Cai, High-fidelity quantum cloning of two nonorthogonal quantum states via weak measurements. Phys. Rev. A 99, 012324 (2019).

  4. Honmgwei Li, Maozhu Xu and Qing-yu Cai, Small imperfect randomness restricts security of quantum key distribution. Phys. Rev. A 98, 062325 (2018).

  5. Xiaokan Guo and Qing-yu Cai, Hidden messenger from quantum geometry: Towards information conservation in quantum gravity. Mod. Phys. Lett. A 33, 1850103 (2018).

  6. Zhiqiang Huang, Dongfeng Gao and Qing-yu Cai, Scalar and Tensor perturbations in vacuum inflation. Classical and Quantym Gravity 34, 105013 (2017).

  7. Dongshan He and Qing-yu Cai, Gravitational correlation, black hole entropy and information conservation, Science China Physical, Mechanical and Astronomy, 60, 040001 (2017).

  8. Yong-gang Tan and Qing-yu Cai, Comment on "Device-independent entanglement-based Bennett 1992 protocol", Phys. Rev. A 93, 066303 (2016).

  9. Guo-An Yan, Qing-Yu Cai and Ai-Xi Chen, Information-holding quantum router of single photons using natural atom, EPJD 70, 93 (2016).

  10. Qing-yu Cai, Chang-pu Sun and Li You,  Information-carrying Hawking radiation and the number of microstate for a black hole, Nuclear Phys.  B905, 327-336 (2016).

  11. Dongshan He and Qing-yu Cai,Inflation of small true vacuum bubble by quantization of Einstein-Hilbert action,Science China Physics,Mechanics & Astonomy,58, 079801 (2015).

  12. DongShan He,Dongfeng Gao,Qing-yu Cai,Dynamical interpretation of the wavefunction of the universe,Physics Letters B,748,361-365 (2015)。

  13. Dongshan He, Dongfeng Gao, and Qing-yu Cai, Spontaneous creation of the universe from nothing. Phys. Rev. D 89, 083510 (2014).

  14. Hua Lu, Chi-Hang Fred Fung, Qing-yu Cai, Two-way deterministic quantum key distribution against detector-side-channel attacks. Phys. Rev. A 88, 044302 (2013).

  15. Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan and Li You,Information conservation is fundamental: Recovering the lost information in Hawking radiation. IJMPD, 22, 1341014 (2013). First prize in the 2013 Essay Competition of the Gravity Research Foundation.

  16. Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan and Li You,Towards experimentally testing the paradox of black hole information loss,Phys. Rev. D 87, 044006 (2013).

  17. Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau and Qing-yu Cai, Quantum key distribution with delayed privacy amplification and its application to the security proof of a two-way deterministic protocol,Phys. Rev. A  85 032308 (2012).

  18. Baocheng Zhang, Qing-yu Cai and Ming-sheng Zhan,Entropy Conservation in the Transition of Schwarzschild-de Sitter Space to de Sitter Space through Tunneling,Chin. Phys. Lett., 29, 020401 (2012).

  19. Hua Lu, Chi-Hang Fred Fung, Xiongfeng Ma, Qing-yu Cai, Unconditional security proof of a deterministic quantum key distribution with a two-way quantum channel,Phys. Rev. A 84, 042344 (2011).

  20. Yong-Gang Tan and Qing-Yu Cai,Passive decoy state quantum key distribution with finite resource, International Journal of Quantum Information 9, 903 (2011)

  21. Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan, Li You, Noncommutative information is revealed from Hawking radiation as tunneling,EPL 94, 20002 (2011)

  22. Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan and Li You, An interpretation for the entropy of a black hole,Gen. Rel. Grav. 43, 797-804 (2011).

  23. Baocheng Zhang, Qing-Yu Cai, Ming-Sheng Zhan and Li You,Entropy is conserved in Hawking radiation as tunneling: A revisit of the black hole information loss paradox,Annals of Physics 326, 350-363 (2011).

  24. Baocheng Zhang, Qing-Yu Cai, and Ming-Sheng Zhan,Thermodynamics inducing massive particles' tunneling and cosmic censorship,Euro. Phys. J. C 68, 561-566 (2010).

  25. Xuan-Yang Lai, Qing-Yu Cai and Ming-Sheng Zhan,Bohmian mechanics to high-order harmonic generation,Chin. Phys. B 19, 020302 (2010).

  26. Yong-gang Tan, Qing-yu Cai, Practical decoy state quantum key distribution with finite resource,Euro. Phys. J. D 56, 449-455 (2010).

  27. X. Y. Lai, Qing-yu Cai, M.S. Zhan, From a quantum to a classical description of intense laser-atom physics with Bohmian trajectories,New J. Phys 11, 113035 (2009).

  28. X. Y. Lai, Qing-yu Cai, M. S. Zhan,Above-threshold ionization photoelectron spectrum from quantum trajectory,Euro. Phys. J. D 53, 393-396 (2009).

  29. Baocheng Zhang, Qing-Yu Cai, Ming-Sheng Zhan,The temperature in Hawking radiation as tunneling,Phys. Lett. B 671, 310-313 (2009).

  30. Baocheng Zhang, Qing-yu Cai, Li You and Ming-sheng Zhan, Hidden messenger revealed in Hawking radiation: A resolution to the paradox of black hole information loss,Phys. Lett. B 675, 98-101 (2009).

  31. Yong-gang Tan, Hua Lu, Qing-yu Cai, Comment on "Quantum Key Distribution with Classical Bob",Phys. Rev. Lett. 102, 098901 (2009).

  32. Hua Lu and Qing-Yu Cai,Quantum ky distribution with classical Alice,International Journal of Quantum Information 6, 1195-1202 (2008)

  33. Yong-Gang Tan, Qing-Yu Cai, Ting-Yun Shi,Indistinguishability of orthogonal time-separated Bell states,Chin. Phys. B 17, 3194-3197 (2008).

  34. Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan,Hawking radiation as tunneling derived from black hole thermodynamics through the quantum horizon,Phys. Lett. B 665, 260-263 (2008)

  35. Yong-Gang Tan, Qing-Yu Cai, Classical correlation in quantum dialogue,International Journal of Quantum Information 6, 325-329 (2008).

  36. Yong-Gang Tan, Qing-Yu Cai, Ting-Yun Shi,Quantum overloading cryptography using single-photon nonlocality,Chinese Physics Letters 24, 2177-2180 (2007).

  37. Qing-Yu Cai and Lu Hua,Quantum key distribution against Trojan horse attacks,Chin. Phys. Lett. 24, 1154-1157 (2007).

  38. Qing-yu Cai, and Yong-gang Tan,Photon-number-resolving decoy-state quantum key distribution,Phys. Rev. A 73, 032305 (2006).

  39. Qing-Yu Cai,Eavesdropping on the two-way quantum communication protocols with invisible photons,Phys. Lett. A 351, 23-25 (2006).

  40. Qing-yu Cai,Information erasure and recovery in quantum memory,Chin. Phys. Lett. 21, 1189-1190 (2004).

  41. Qing-yu Cai and Bai-wen Li, Improving the capacity of the Bostrom-Felbinger protocol,Phys. Rev. A 69, 054301 (2004)

  42. Qing-yu Cai and Bai-wen Li,Deterministic secure communication without using entanglement,Chin. Phys. Lett. 21, 601-603 (2004).

  43. Qing-yu Cai,The "ping-pong" protocol can be attacked without eavesdropping,Phys. Rev. Lett., 91, 109801 (2003).


Research Interests

Black hole information loss paradox.

Quantum cosmology;

Spacetime and quantum entanglement.


Students

已指导学生 

 黄志强  博士研究生  070201-理论物理   

 王明浩  博士研究生  070201-理论物理   

 现指导学生 

 李恺  博士研究生  070201-理论物理   

 明熙  博士研究生  070201-理论物理   

 袁永熹  博士研究生  070201-理论物理   

 王倚天  硕士研究生  070201-理论物理   

 宋从刚  硕士研究生  070201-理论物理