Relatively-long time decay of Loschmidt echo of a Bose-Einstein condensate in a double-well potential
Relatively-long time decay of Loschmidt echo of a Bose-Einstein condensate in a double-well potential
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DOI：
10.1140/epjd/e2010-00090-y
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Q. Zheng;Wen Wang;X. P. Zhang;Z. Ren
中科院分区：
文献类型：
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作者：
Q. Zheng;Wen Wang;X. P. Zhang;Z. Ren
本文研究了双势阱中玻色-爱因斯坦凝聚体的量子洛歇回波（LE）的长时间衰减。在BEC的隧穿和自陷阶段，LE分别有指数和高斯衰减，相对较长的时间。在交叉区，LE的行为不同于隧穿和自陷阶段。这些结果表明，相对较长的时间衰减的LE是合适的表征的动力学相变的BEC。
We study the long-time decay of quantum Loschmidt echo (LE) of a Bose-Einstein condensate (BEC) in a double-well potential. In the tunneling and self-trapping phases of the BEC, the LE has exponential and Gaussian decays, respectively, for relatively-long times. In the crossover region, the LE behaves differently from both the tunneling and the self-trapping phases. These results indicate that relatively-long time decay of the LE is suitable for characterizing the dynamical phase transition of the BEC.