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arXiv 1306.1420quant-phcond-mat.stat-mech
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蜂窝晶格外自旋为3/2的Affleck-Kennedy-Lieb-Tasaki态的量子计算普适性

Quantum computational universality of spin-3/2 Affleck-Kennedy-Lieb-Tasaki states beyond the honeycomb lattice

Tzu-Chieh Wei

摘要:

通用量子计算可以通过简单地对高度纠缠的资源态(如团簇态)进行单自旋测量来实现。最近已经探索了Affleck-Kennedy-Lieb-Tasaki(AKLT)态家族;例如,自旋为1的AKLT链可以用于模拟单个量子位上的单量子位门操作,而蜂窝晶格上的自旋为3/2的二维AKLT态可以用作通用资源。然而,目前还不清楚这种普适性是特定状态的巧合还是所有二维AKLT状态的共同特征。在这里,我们认为家庭的自旋3/2 AKLT状态的各种三价阿基米德晶格,并表明,除了蜂窝晶格,自旋3/2 AKLT状态的正方形八角形$(4,8^2)$和“十字”$(4,6,12)$晶格也是普遍的资源,而AKLT状态的“星”$(3,12^2)$晶格可能不是由于几何挫折。

英文摘要:

Universal quantum computation can be achieved by simply performing single-spin measurements on a highly entangled resource state, such as cluster states. The family of Affleck-Kennedy-Lieb-Tasaki (AKLT) states has recently been explored; for example, the spin-1 AKLT chain can be used to simulate single-qubit gate operations on a single qubit, and the spin-3/2 two-dimensional AKLT state on the honeycomb lattice can be used as a universal resource. However, it is unclear whether such universality is a coincidence for the specific state or a shared feature in all two-dimensional AKLT states. Here we consider the family of spin-3/2 AKLT states on various trivalent Archimedean lattices and show that in addition to the honeycomb lattice, the spin-3/2 AKLT states on the square octagon $(4,8^2)$ and the `cross' $(4,6,12)$ lattices are also universal resource, whereas the AKLT state on the `star' $(3,12^2)$ lattice is likely not due to geometric frustration.

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