Long-term stable continuous variable entanglement generation in type-II non-degenerate optical parametric amplifier | Zendy

Long Ma | Zendy; Hui Guo | Zendy; Kui Liu | Zendy; Hengxin Sun | Zendy; Jiangrui Gao | Zendy

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Long-term stable continuous variable entanglement generation in type-II non-degenerate optical parametric amplifier

Author(s) -

Long Ma,

Hui Guo,

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 , spontaneous parametric down conversion , optics , optical amplifier , quantum optics , continuous variable , quantum mechanics , quantum information , term (time) , quantum , 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.

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