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Proceedings Article

Polarization-purity spectra of a tapered-fiber-coupled microsphere cavity system at cryogenic temperatures

[+] Author Affiliations
Masazumi Fujiwara, Akira Tanaka, Kiyota Toubaru, Hong-Quan Zhao, Hideaki Takashima, Shigeki Takeuchi

Hokkaido Univ. (Japan) and Osaka Univ. (Japan)

Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 791317 (February 18, 2011); doi:10.1117/12.874587
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From Conference Volume 7913

  • Laser Resonators and Beam Control XIII
  • Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko
  • San Francisco, California, USA | January 22, 2011

abstract

An ultrahigh-Q optical microcavity coupled with a tapered fiber is an ideal system for the cavity quantum electrodynamics (CQED). In particular realizing this system at cryogenic temperature is vitally important and has been recently explored for various CQED applications including solid-state atom-photon strong coupling, vibrational mode cooling, and photonic quantum gates. These cryogenic fiber-coupled microcavity systems, however, suffer from mechanical vibrations due to cooling systems and distortions caused by large temperature change. These factors may cause the degradation in polarization of probe light field in the system. Here we report the analysis of the polarization state in a tapered-fiber-coupled microsphere cavity at cryogenic temperatures. By scanning the wavelength of the probe light at around 637 nm, which can be used for the diamond nitrogen vacancy centers, the spectral analysis of the polarization state was performed at 8-30 K. We have found that the degree of polarization (DOP, classical analogue of purity) at cryogenic temperatures does not show significant change compared to that measured at room temperature. This fact indicates that the system can conserve the polarization at low temperature to the extent comparable to that at room temperature, which is enough for the evaluation of the quantum phase gate.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Masazumi Fujiwara ; Akira Tanaka ; Kiyota Toubaru ; Hong-Quan Zhao ; Hideaki Takashima, et al.
"Polarization-purity spectra of a tapered-fiber-coupled microsphere cavity system at cryogenic temperatures", Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 791317 (February 18, 2011); doi:10.1117/12.874587; http://dx.doi.org/10.1117/12.874587


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