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arXiv quant-ph/0406235quant-ph
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遍历量子计算

Ergodic quantum computing

Dominik Janzing, Pawel Wocjan

摘要:

我们提出了一个量子计算的(理论;-)模型,其中的结果可以读出的时间平均的哈密顿动力学的2维晶体上的圆柱。哈密顿量是包含6个量子比特的Wigner-Seitz单元之间的空间局部相互作用。所模拟的量子线路由程序量子位的初始化指定。正如在马戈勒斯的哈密尔顿元胞自动机(实现经典电路)中一样,时钟寄存器中的传播波异步地控制门的应用。然而,在我们的方法中,所有需要的初始化都是基态。过了一会儿,同步波基本上散布在整个晶体周围。该电路被设计成使得结果以约1/4的概率可用,而不管完全未定义的计算步骤。该模型将量子计算简化为在计算基础上为一些量子比特准备基态、等待和测量。尽管在真实固体中可能不太可能找到我们的特定哈密顿量,但更自然的相互作用也可能允许遍历量子计算。

英文摘要:

We propose a (theoretical ;-) model for quantum computation where the result can be read out from the time average of the Hamiltonian dynamics of a 2-dimensional crystal on a cylinder. The Hamiltonian is a spatially local interaction among Wigner-Seitz cells containing 6 qubits. The quantum circuit that is simulated is specified by the initialization of program qubits. As in Margolus' Hamiltonian cellular automaton (implementing classical circuits), a propagating wave in a clock register controls asynchronously the application of the gates. However, in our approach all required initializations are basis states. After a while the synchronizing wave is essentially spread around the whole crystal. The circuit is designed such that the result is available with probability about 1/4 despite of the completely undefined computation step. This model reduces quantum computing to preparing basis states for some qubits, waiting, and measuring in the computational basis. Even though it may be unlikely to find our specific Hamiltonian in real solids, it is possible that also more natural interactions allow ergodic quantum computing.

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