Journal
OPTICS EXPRESS
Volume 24, Issue 22, Pages 25619-25628Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.025619
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Funding
- 973 Programs of China [2013CB328700, 2011CBA00303]
- National Natural Science Foundation of China [61575102, 61321004]
- Tsinghua University Initiative Scientific Research Program [20131089382]
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In this paper, a generation scheme of telecom band frequency-degenerate polarization entangled photon pairs is proposed and demonstrated experimentally. It is based on the vector spontaneous four wave mixing (SFWM) process in a Sagnac fiber loop, in which two frequency-degenerate and polarization orthogonal biphoton states have equal probabilities for generating along the clockwise and counter-clockwise directions. The quantum interference between them at the 50: 50 fiber coupler of the fiber loop separates the two frequency-degenerate photons in a pair, leading to the generation of polarization entanglement. The raw fringe visibilities of the two-photon interferences under two non-orthogonal polarization bases are 91% and 90%, respectively. Information can be encoded on the generated photon pairs using the polarization entangled Bell states, which requires the frequency-degenerate property. It is demonstrated by a simplified Bell state measurement with a fringe visibility of 83%. (C) 2016 Optical Society of America
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