Quantum information processing with linear optics and atomic ensembles
Zusammenfassung der Projektergebnisse
The target of this project is to develop the methods for efficient quantum information processing (QIP) by integrating atomic-ensemble based quantum memories into linear optical systems. As is well-known that atomic ensembles are good candidates for stationary qubits and photons can be taken as information carrier and manipulated in a sophisticated way for information processing. Therefore, interaction and conversion between light fields and atomic excitations are the basic physical problems for such a combined system. Along this direction and according to the proposed research plan, we have fully achieved the proposed objectives and scientific goals. Since April 2004, supported by the Emmy-Noether-Programm, we have successfully formed an internationally research team on Quantum information processing with linear optics and atomic ensembles. During the support of this project, a modernized quantum optics lab was built with the effort of the research team. With this platform, a significant progress has been achieved along the road of demonstrating the fundamental element, a quantum repeater node, for the future practical quantum network. Several novel and important experiments have been performed. In accordance to the original research plan, the proposed objectives have been all achieved in cold atomic ensembles instead of atomic vapors in room-temperature glass cells. Relevant scientific problems have been experimentally investigated which has resulted in innovative techniques for constructing future quantum networks. These experimental demonstrations have already contributed important knowledge to and will become classical references for the field of quantum information processing. Popular descriptions on our scientific achievements: 1. “Quantum repeater demonstrated” was elected to be "The best of 2008" by Physics World http://physicsworld.com/cws/article/news/37182 2. “Ein stabiler Quanten-Repeater”, http://www.pro-physik.de, August 29, 2008; 3. “Quantum cryptography can go the distance”, Nature News, Geoff Brumfiel, August 27, 2008; 4. “Quantum repeater demonstrated”, Physics Web, August 27, 2008; 5. “Researchers Demonstrate Quantum Teleportation and Memory in Tandem”, PhysORG, January 30, 2008; 6. “Neues zur Quanten-Teleportation”, http://www.pro-physik.de, January 23, 2008; 7. “Quantum physics: Dead and alive”, Nature, Research Highlights, p232, January 18, 2007; 8. “Photonic Schroedinger cat breaks record”, Physics Web, January 16, 2007; 9. “Single-photon source may meet the needs of quantum communication systems”, PhysORG, November 09, 2006; 10. “Full Entangled House”, Scientific American, January 25, 2005; 11. “Technology Research Advances of 2004”, MIT Technology Research News, December 29, 2004 - January 5, 2005; 12. “Highlights of the year”, Physics Web，December 23, 2004; 13. “The Top Physics Story for 2004”, Phil Schewe and Ben Stein, Physics News Update, December 1, 2004; 14. “Quantum snare entraps key fifth photon”, Science News Online, July 17, 2004; 15. “Entanglement breaks new record”, Physics Web, June 30, 2004; 16. “Five-Photon Entanglement”, Phil Schewe and Ben Stein, Physics News Update, June 30, 2004
Projektbezogene Publikationen (Auswahl)
- Experimental demonstration of five-photon entanglement and open-destination teleportation. Nature 430, 55-58(2004)
Zhi Zhao, Yu-Ao Chen, An-Ning Zhang, Tao Yang, Hans J. Briegel & Jian-Wei Pan
- Deterministic and Storable Single-Photon Source Based on a Quantum Memory. Phys. Rev. Lett. 97, 173004 (2006)
Shuai Chen, Yu-Ao Chen, Thorsten Strassel, Zhen-Sheng Yuan, Bo Zhao, Jörg Schmiedmayer, and Jian-Wei Pan
- Collisional decoherence during writing and reading quantum states. Phys. Rev. A 75, 040101(R) (2007)
Stephanie Manz, Thomas Fernholz, Jörg Schmiedmayer, and Jian-Wei Pan
- Demonstration of a Stable Atom-Photon Entanglement Source for Quantum Repeaters. Phys. Rev. Lett. 99, 180505 (2007)
Shuai Chen, Yu-Ao Chen, Bo Zhao, Zhen-Sheng Yuan, Jörg Schmiedmayer, and Jian-Wei Pan
- Experimental entanglement of six photons in graph states. Nature Physics 3, 91 - 95 (2007)
Chao-Yang Lu, Xiao-Qi Zhou, Otfried Gühne, Wei-Bo Gao, Jin Zhang, Zhen-Sheng Yuan, Alexander Goebel, Tao Yang and Jian-Wei Pan
- Fault-tolerant quantum repeater with atomic ensembles and linear optics. Phys. Rev. A 76, 022329 (2007)
Zeng-Bing Chen, Bo Zhao, Yu-Ao Chen, Jörg Schmiedmayer, and Jian-Wei Pan
- Robust Creation of Entanglement between Remote Memory Qubits. Phys. Rev. Lett. 98, 240502 (2007)
Bo Zhao, Zeng-Bing Chen, Yu-Ao Chen, Jörg Schmiedmayer, and Jian-Wei Pan
- Synchronized Independent Narrow-Band Single Photons and Efficient Generation of Photonic Entanglement. Phys. Rev. Lett. 98, 180503 (2007)
Zhen-Sheng Yuan, Yu-Ao Chen, Shuai Chen, Bo Zhao, Markus Koch, Thorsten Strassel, Yong Zhao, Gan-Jun Zhu, Jörg Schmiedmayer, and Jian-Wei Pan
- Experimental demonstration of a BDCZ quantum repeater node. Nature 454, 1098 (2008)
Zhen-Sheng Yuan, Yu-Ao Chen, Bo Zhao, Shuai Chen, Jörg Schmiedmayer, Jian-Wei Pan
- Memory-built-in quantum teleportation with photonic and atomic qubits. Pan Nature Physics 4, 103 (2008)
Yu-Ao Chen, Shuai Chen, Zhen-Sheng Yuan, Bo Zhao, Chih-Sung Chuu, Jörg Schmiedmayer, Jian-Wei Pan
- Quantum Memory with Optically Trapped Atoms. Phys. Rev. Lett. 101, 120501 (2008)
Chih-Sung Chuu, Thorsten Strassel, Bo Zhao, Markus Koch, Yu-Ao Chen, Shuai Chen, Zhen-Sheng Yuan, Jörg Schmiedmayer, and Jian-Wei Pan
- A millisecond quantum memory for scalable quantum networks. Nature Physics 5, 95 (2009)
Bo Zhao, Yu-Ao Chen, Xiao-Hui Bao, Thorsten Strasse, Chih-Sung Chuu, Xian-Min Jin, Jörg Schmiedmayer, Zhen-Sheng Yuan, Shuai Chen and Jian-Wei Pan
