Ma L, Guo H, Liu K, Sun H, Gao J. Long-term stable continuous variable entanglement generation in type-II non-degenerate optical parametric amplifier.
OPTICS EXPRESS 2019;
27:35120-35128. [PMID:
31878687 DOI:
10.1364/oe.27.035120]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
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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