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arXiv quant-ph/0604137quant-ph
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态转移和自旋测量

State Transfer and Spin Measurement

A. Kay

摘要:

我们提出了一个哈密顿量,可用于放大信号从一个量子态,使测量的宏观可观察到确定一个单一的自旋状态。我们证明了一个一般的映射之间的哈密顿量和交换哈密顿量的任意耦合强度和本地磁场。这有利于使用现有的计划完美的状态转移,以提供完美的放大。我们进一步证明了这个固定的哈密顿量和经典的元胞自动机的演变之间的联系,从而统一以前的方法,这个放大任务。最后,我们展示了如何使用新的哈密顿量完美的状态转移,到目前为止,独特的情况下,总自旋是不保守的演变过程中,并证明,这产生了显着不同的反应中存在的退相干。

英文摘要:

We present a Hamiltonian that can be used for amplifying the signal from a quantum state, enabling the measurement of a macroscopic observable to determine the state of a single spin. We prove a general mapping between this Hamiltonian and an exchange Hamiltonian for arbitrary coupling strengths and local magnetic fields. This facilitates the use of existing schemes for perfect state transfer to give perfect amplification. We further prove a link between the evolution of this fixed Hamiltonian and classical Cellular Automata, thereby unifying previous approaches to this amplification task. Finally, we show how to use the new Hamiltonian for perfect state transfer in the, to date, unique scenario where total spin is not conserved during the evolution, and demonstrate that this yields a significantly different response in the presence of decoherence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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