Terahertz photon production from cold atoms inside an optical cavity

Cunlin Zhang; Jingwu Ye

doi:10.1117/12.870433

16 November 2010 Terahertz photon production from cold atoms inside an optical cavity

Cunlin Zhang, Jingwu Ye

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 78540E (2010) https://doi.org/10.1117/12.870433
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The Dicke model was proposed by Dicke in 1954 to describe a single mode of photon coupled to an assembly of N atoms with the same strength. It was found that there is a quantum phase transition from a normal phase at weak coupling to a super-radiant phase at strong coupling at the thermodynamic limit N =∞. Here, we solve the model at N ≥ 1 and also discuss its possible experimental implementations inside a cavity. By studying the Dicke model by 1/N expansion, we identify an emergent quantum phase diffusion mode inside the super-radiant phase and also work out many remarkable experimental consequences of this mode such as its low frequency, photon number squeezing properties and photon statistics. The energy of the phase diffusion modecan be continuously tuned into many frequency ranges from Micro-wave to Terahertz (THz) to Infra-red. The photons from the super-radiant phase are in a number squeezed state with much enhanced signal/noise ratio which may have wide applications in quantum information processing. The photon statistics is strong sub-Poissonian. The effects of dissipations due to leaking photons out of the cavity are also discussed. The connections with the recent experiments of the strong coupling of a BEC of N ~ 10⁵ ⁸⁷Rb atoms to the photons inside an ultrahigh-finess optical cavity are carefully analyzed. Several experimental schemes to detect the phase diffusion mode are proposed.

Citation Download Citation

Cunlin Zhang and Jingwu Ye "Terahertz photon production from cold atoms inside an optical cavity", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78540E (16 November 2010); https://doi.org/10.1117/12.870433

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KEYWORDS

Chemical species

Optical resonators

Diffusion

Quantum information processing

Rubidium

Statistical modeling

Terahertz radiation

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