原子数宇称控制的光晶格中玻色-爱因斯坦凝聚体的介观量子开关
Mesoscopic quantum switching of a Bose-Einstein condensate in an optical lattice governed by the parity of the number of atoms
摘要：
结果表明，对于$N$玻色子系统的奇偶性$N$可以负责系统响应的参数变化的定性差异。考虑了非线性玻色子模型，该模型描述了两个不同的具有相同能量的模式$X_{1,2}$之间玻色子对的隧穿，并适用于光晶格中的玻色-爱因斯坦凝聚体.通过改变晶格深度，可以诱导宇称相关的量子开关，即对于偶数$N$为$X_1\to X_2$，对于奇数$N$为$X_1\to X_1$，对于任意大的$N$。提出了一个简单的计划，通过使用反弹开关制度，这是不敏感的初始状态的准备（只要只有一个的两个$X_l$模式显着填充），在小扰动下稳定，并需要一个实验上可访问的相干时间的奇偶校验效应的观察\textit{mesoscopic scale}。
英文摘要：
It is shown that for a $N$-boson system the parity of $N$ can be responsible for a qualitative difference in the system response to variation of a parameter. The nonlinear boson model is considered, which describes tunneling of boson pairs between two distinct modes $X_{1,2}$ of the same energy and applies to a Bose-Einstein condensate in an optical lattice. By varying the lattice depth one induces the parity-dependent quantum switching, i.e. $X_1\to X_2$ for even $N$ and $X_1\to X_1$ for odd $N$, for arbitrarily large $N$. A simple scheme is proposed for observation of the parity effect on the \textit{mesoscopic scale} by using the bounce switching regime, which is insensitive to the initial state preparation (as long as only one of the two $X_l$ modes is significantly populated), stable under small perturbations and requires an experimentally accessible coherence time.
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