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Complete Control of Frequency-Time Correlation of Narrow-Band Biphotons from Cold Atoms

Young‐Wook Cho, Kwang-Kyoon Park, Jong Chan Lee, Yoon-Ho Kim

Published Jan 1, 2015• 0 citations
Publisher

Abstract

The nonclassical photon pair is naturally endowed with a specific form of frequency-time quantum correlations. Here, we report complete control of time quantum correlations of narrowband biphotons generated in a cold atomic ensemble.
DOI
10.1364/cleo_qels.2015.fth4b.2

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The nonclassical photon pair, generated via a parametric process, is naturally endowed with a specific form of frequency-time quantum correlations. Here, we report complete control of frequency-time quantum correlations of narrow-band biphotons generated via spontaneous four-wave mixing in a cold atomic ensemble. We have experimentally confirmed the generation of frequency-anticorrelated, frequency-correlated, and frequency-uncorrelated narrow-band biphoton states, as well as verifying the strong nonclassicality of the correlations. Our work opens up new possibilities for engineering narrow-band entangled photons for various quantum optical and quantum information applications.
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Driven by the desire of narrow-band photon pairs source, in this Mphil thesis work, we demonstrate the generation of photon pairs with controllable coherence time up to 1.72 microseconds, using spontaneous four-wave mixing with electromagnetically induced transparency in a laser-cooled atomic ensemble with an optical depth (OD) as high as 130. At such a high OD, we find that the pump laser intensity profile has a significant effect on the time-frequency entangled two-photon waveform. We also confirm the quantum particle nature of heralded narrow-band single photons generated from this source.