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

Masazumi Fujiwara; Akira Tanaka; Kiyota Toubaru; Hong-Quan Zhao; Hideaki Takashima; Shigeki Takeuchi

doi:10.1117/12.874587

18 February 2011 Polarization-purity spectra of a tapered-fiber-coupled microsphere cavity system at cryogenic temperatures

Masazumi Fujiwara, Akira Tanaka, Kiyota Toubaru, Hong-Quan Zhao, Hideaki Takashima, Shigeki Takeuchi

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Proceedings Volume 7913, Laser Resonators and Beam Control XIII; 791317 (2011) https://doi.org/10.1117/12.874587
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

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

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KEYWORDS

Polarization

Cryogenics

Temperature metrology

Optical microcavities

Diamond

Single mode fibers

Silica

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