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

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

2011-01-27

arxiv.org/abs/1101.5198v1

Optics Express, Vol. 19, Issue 3, pp. 2278-2285 (2011)

Physics

Quantum Physics

8 pages, 3 figures

Scientific paper

10.1364/OE.19.002278

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 (\bar{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 \pm 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.

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