Journal
OPTICA
Volume 1, Issue 2, Pages 84-88Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.1.000084
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Funding
- Hong Kong Research Grants Council [601411]
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The generation of nonclassical photon pairs with a long coherence time is key for applications that range from fundamental to quantum communication and metrology. Spontaneous four-wave mixing with electromagnetically induced transparency has been demonstrated as one of the most efficient methods; however, narrowing the bandwidth and producing photon pairs with a temporal length beyond 1 mu s remains a technical challenge due to noise considerations and the need for cold atoms with a high optical depth (OD). In this work, we demonstrate the generation of narrowband photon pairs with a controllable coherence time up to 1.72 mu s in a laser-cooled atomic ensemble with an OD as high as 130. At such a high OD, we find that the pump laser field spatial profile has a significant effect on the time-frequency entangled two-photon waveform. We also confirm the quantum particle nature of heralded narrowband single photons generated from this source. (C) 2014 Optical Society of America
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