掺杂晶体中的NMR量子自动机
NMR Quantum Automata in Doped Crystals
摘要：
在原子核自旋的晶格${\cal L}$中.这种嵌入在单晶固体中的周期性结构，每个ABC单元可以用来存储量子信息，并且这些信息可以通过某种细胞移位机制四处移动。杂质掺杂标记了一个特殊的位置D $\not\in{\cal L}$，它与局部自旋晶格一起构成了一个量子自动机，其中D位置作为输入/输出端口，通用量子逻辑是通过D和附近位置的两个自旋之间的两体相互作用完成的。这种新型的核磁共振量子计算机可以很容易地放大，并且可以在低温下工作，以克服室温核磁共振中信噪比指数衰减的问题。
英文摘要：
In a lattice ${\cal L}$ of nuclear spins with ABCABCABC... type periodic structure embedded in a single-crystal solid, each ABC-unit can be used to store quantum information and the information can be moved around via some cellular shifting mechanism. Impurity doping marks a special site D$\not\in{\cal L}$ which together with the local spin lattice constitute a quantum automaton where the D site serves as the input/output port and universal quantum logic is done through two-body interactions between two spins at D and a nearby site. The novel NMR quantum computer can be easily scaled up and may work at low temperature to overcome the problem of exponential decay in signal-to-noise ratio in room temperature NMR.
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