通过调制隧穿速率有效产生最大纠缠态
Efficient creation of maximally entangled states by modulation of tunneling rates
摘要：
对于由两个站点的玻色-哈伯德哈密尔顿描述的系统，我们表明，正弦调制的隧穿矩阵元素协助高阶共隧穿过程。利用这种机制，我们提出了一个有效的新方案，用于创建一个相干叠加态，其中所有粒子要么在一个网站上，要么在其他网站上，所谓的NOON状态。该方案周期性地产生几乎完美的NOON状态。对于较大数量的粒子，如果采用多于一个调制频率，则可以进一步减少创建状态的时间。利用这个方案，可以用最先进的技术在双阱势中实现具有更多粒子数的NOON态。
英文摘要：
For systems described by the two-site Bose-Hubbard Hamiltonian, we show that a sinusoidal modulation of the tunneling matrix element assists higher-order co-tunneling processes. Using this mechanism, we propose an efficient new scheme for creating a coherent superposition of states in which all particles are either on one site or all on the other site, the so-called NOON state. This scheme yields an almost perfect NOON state periodically. For larger numbers of particles, further reduction of the time to create the state is possible if more than one modulation frequency is employed. With this scheme, NOON states with a larger number of particles could be realized with state-of-the-art techniques for cold Bose gases in a double-well potential.
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