期刊
PHYSICAL REVIEW A
卷 97, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.043809
关键词
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资金
- National Key R&D Program of China [2017YFA0304800]
- National Natural Science Foundation of China [61525504, 61722510, 61435011, 11174271, 61275115, 11604322]
- Anhui Initiative in Quantum Information Technologies [AHY020200]
Entangled photon pairs are critically important in fundamental quantum mechanics research as well as in many areas within the field of quantum information, such as quantum communication, quantum computation, and quantum cryptography. Previous demonstrations of entangled photons based on atomic ensembles were achieved by using a reference laser to stabilize the phase of two spontaneous four-wave mixing paths. Here, we demonstrate a convenient and efficient scheme to generate polarization-entangled photons with a narrow bandwidth of 57.2 +/- 1.6 MHz and a high-fidelity of 96.3 +/- 0.8% by using a phase self-stabilized multiplexing system formed by two beam displacers and two half-wave plates where the relative phase between the different signal paths can be eliminated completely. It is possible to stabilize an entangled photon pair for a long time with this system and produce all four Bell states, making this a vital step forward in the field of quantum information.
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