中国物理B ›› 2008, Vol. 17 ›› Issue (5): 1798-1803.doi: 10.1088/1674-1056/17/5/041

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Two narrow bandwidth photons interfering in an electromagnetically induced transparency (EIT) system

王福源, 史保森, 陆小松, 郭光灿   

  1. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2007-07-29 修回日期:2007-09-23 出版日期:2008-05-20 发布日期:2008-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10674126) and the State Key Program for Basic Research of China (Grant No 2001CB309300).

Two narrow bandwidth photons interfering in an electromagnetically induced transparency (EIT) system

Wang Fu-Yuan(王福源), Shi Bao-Sen(史保森), Lu Xiao-Song(陆小松), and Guo Guang-Can(郭光灿)   

  1. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • Received:2007-07-29 Revised:2007-09-23 Online:2008-05-20 Published:2008-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10674126) and the State Key Program for Basic Research of China (Grant No 2001CB309300).

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摘要： In this paper, we have analysed in detail the quantum interference of the degenerate narrowband two-photon state by using a Mach--Zehnder interferometer, in which an electromagnetically induced transparency (EIT) medium is placed in one of two interfering beams. Our results clearly show that it is possible to coherently keep the quantum state at a single photon level in the EIT process, especially when the transparent window of the EIT medium is much larger than the bandwidth of the single photon. This shows that the EIT medium is possibly a kind of memory or repeater for the narrowband photons in the areas of quantum communication and quantum computer. This kind of experiment is feasible within the current technology.

Abstract: In this paper, we have analysed in detail the quantum interference of the degenerate narrowband two-photon state by using a Mach--Zehnder interferometer, in which an electromagnetically induced transparency (EIT) medium is placed in one of two interfering beams. Our results clearly show that it is possible to coherently keep the quantum state at a single photon level in the EIT process, especially when the transparent window of the EIT medium is much larger than the bandwidth of the single photon. This shows that the EIT medium is possibly a kind of memory or repeater for the narrowband photons in the areas of quantum communication and quantum computer. This kind of experiment is feasible within the current technology.

Key words: EIT, narrow bandwidth, photons, interference

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
03.67.Hk (Quantum communication) 03.67.Lx (Quantum computation architectures and implementations) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.50.Md (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)