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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 3 — Jan. 31, 2011
  • pp: 2278–2285

Phase shift spectra of a fiber–microsphere system at the single photon level

Akira Tanaka, Takeshi Asai, Kiyota Toubaru, Hideaki Takashima, Masazumi Fujiwara, Ryo Okamoto, and Shigeki Takeuchi  »View Author Affiliations


Optics Express, Vol. 19, Issue 3, pp. 2278-2285 (2011)
http://dx.doi.org/10.1364/OE.19.002278


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Abstract

We succeeded in measuring phase shift spectra of a micro-sphere cavity coupled with a tapered fiber using a weak coherent probe light at the single photon level. We utilized a tapered fiber with almost no depolarization and constructed a very stable phase shift measurement scheme based on polarization analysis using photon counting. Using a very weak probe light ( = 0.41), we succeeded in observing the transition in the phase shift spectrum between undercoupling and overcoupling (at gap distances of 500 and 100 nm, respectively). We also used quantum state tomography to obtain a ‘purity spectrum’. Even in the overcoupling regime, the average purity was 0.982±0.024 (minimum purity: 0.892), suggesting that the coherence of the fiber–microsphere system was well preserved. Based on these results, we believe this system is applicable to quantum phase gates using single light emitters such as diamond nitrogen vacancy centers.

© 2011 Optical Society of America

OCIS Codes
(140.3948) Lasers and laser optics : Microcavity devices
(060.5565) Fiber optics and optical communications : Quantum communications
(270.5565) Quantum optics : Quantum communications

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: December 20, 2010
Revised Manuscript: January 18, 2011
Manuscript Accepted: January 18, 2011
Published: January 24, 2011

Citation
Akira Tanaka, Takeshi Asai, Kiyota Toubaru, Hideaki Takashima, Masazumi Fujiwara, Ryo Okamoto, and Shigeki Takeuchi, "Phase shift spectra of a fiber–microsphere system at the single photon level," Opt. Express 19, 2278-2285 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-3-2278


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