Open AccessLong-term stable continuous variable entanglement generation in type-II non-degenerate optical parametric amplifier
Author(s) -
Long Ma,
Guo Hui,
Kui Liu,
Hengxin Sun,
Jiangrui Gao
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.035120
Subject(s) - quantum entanglement , degenerate energy levels , physics , parametric statistics , continuous variable , spontaneous parametric down conversion , optical amplifier , term (time) , quantum optics , optics , quantum mechanics , quantum information , quantum , statistical physics , mathematics , statistics , laser
Long-term stable entanglement is a crucial aspect in the implementation of reliable quantum information processes. However, long-term continuous variable entanglement generation, especially in type-II non-degenerate optical parametric amplifier, has yet to be reported on. Here, we derive the relationship between entanglement and temperature fluctuations in the crystal of a type-II non-degenerate optical parametric amplifier, and propose a novel method for long-term stable entanglement generation by locking the temperature of the crystal. In the experiment, we obtain a 5.4 dB entanglement lasting two hours. The method holds promise in the generation of a truly usable above 10 dB entanglement and brings us closer to continuous-variable quantum information processing.