利用自旋1/2对和海森堡交换的普适量子计算
Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
摘要：
提出了一种有效而直观的通用量子计算框架，该框架使用自旋为1/2的粒子对来形成逻辑量子比特，并使用单个物理相互作用海森堡交换来产生所有的门操作。只需要两个海森堡门操作就可以产生受控的π相移，而使用三个自旋的仅交换方案需要19个。从深入研究退相干自由子空间，这种架构继承了集体退相干机制的免疫力。这种方法的简单性和适应性应该使其对基于自旋的量子计算架构具有吸引力。
英文摘要：
An efficient and intuitive framework for universal quantum computation is presented that uses pairs of spin-1/2 particles to form logical qubits and a single physical interaction, Heisenberg exchange, to produce all gate operations. Only two Heisenberg gate operations are required to produce a controlled pi-phase shift, compared to 19 for exchange-only proposals employing three spins. Evolved from well-studied decoherence-free subspaces, this architecture inherits immunity from collective decoherence mechanisms. The simplicity and adaptability of this approach should make it attractive for spin-based quantum computing architectures.
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