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

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Title: Phase shift spectra of a fiber-microsphere system at the single photon level
Authors: Tanaka, Akira Browse this author
Asai, Takeshi Browse this author
Toubaru, Kiyota Browse this author
Takashima, Hideaki Browse this author
Fujiwara, Masazumi Browse this author →KAKEN DB
Okamoto, Ryo Browse this author →KAKEN DB
Takeuchi, Shigeki Browse this author →KAKEN DB
Issue Date: 31-Jan-2011
Publisher: Optical Society of America
Journal Title: Optics Express
Volume: 19
Issue: 3
Start Page: 2278
End Page: 2285
Publisher DOI: 10.1364/OE.19.002278
PMID: 21369045
Abstract: We succeeded in measuring phase shift spectra of a microsphere 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 (n[-] = 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.
Rights: © 2011 Optical Society of America
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 竹内 繁樹

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