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

doi:10.1088/1674-1056/17/5/041

Abstract

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.

Keywords: EIT narrow bandwidth photons interference

Received: 29 July 2007
Revised: 23 September 2007
Accepted manuscript online:

PACS:	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	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)

Fund: 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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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) Two narrow bandwidth photons interfering in an electromagnetically induced transparency (EIT) system 2008 Chin. Phys. B 17 1798

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

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