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arXiv 0910.3740quant-ph
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非等轴测测试完成QMA

Testing non-isometry is QMA-complete

Bill Rosgen

摘要:

确定由量子线路增加的最坏情况的不确定性被证明是计算上难以处理的。这是一个检测的问题,当一个量子信道实现为一个电路是接近线性等距,它被证明是完整的复杂性类QMA的可验证的量子计算。这是通过将检测通道何时接近等距的问题与确定当输入是纯状态时通道的输出可以混合到何种程度的问题相关联来完成的。通道输出的混合程度可以通过使用交换测试的协议来检测:这是因为并行应用两次的等距不会影响交换操作下输入状态的对称性。

英文摘要:

Determining the worst-case uncertainty added by a quantum circuit is shown to be computationally intractable. This is the problem of detecting when a quantum channel implemented as a circuit is close to a linear isometry, and it is shown to be complete for the complexity class QMA of verifiable quantum computation. This is done by relating the problem of detecting when a channel is close to an isometry to the problem of determining how mixed the output of the channel can be when the input is a pure state. How mixed the output of the channel is can be detected by a protocol making use of the swap test: this follows from the fact that an isometry applied twice in parallel does not affect the symmetry of the input state under the swap operation.

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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