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arXiv 1004.3247quant-phcond-mat.mes-hall
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量子计算时间的限制:临界环境下的量子纠错

Bound on quantum computation time: Quantum error correction in a critical environment

E. Novais, Eduardo R. Mucciolo, Harold U. Baranger

摘要:

我们得到了一个上限的时间可用于量子计算,对于一个给定的量子计算机和散肩环境与量子纠错实施。首先,我们推导出一个显式的量子演化算符的逻辑量子比特,并表明它具有相同的形式为物理量子比特,但与环境的耦合强度降低。利用这个演化算符,我们在两种情况下找到了逻辑量子比特的实态和理想态之间的迹距离。对于超欧姆浴,迹线距离饱和,而对于欧姆或亚欧姆浴,在迹线距离超过用户设置的值之前存在有限的时间。

英文摘要:

We obtain an upper bound on the time available for quantum computation for a given quantum computer and decohering environment with quantum error correction implemented. First, we derive an explicit quantum evolution operator for the logical qubits and show that it has the same form as that for the physical qubits but with a reduced coupling strength to the environment. Using this evolution operator, we find the trace distance between the real and ideal states of the logical qubits in two cases. For a super-Ohmic bath, the trace distance saturates, while for Ohmic or sub-Ohmic baths, there is a finite time before the trace distance exceeds a value set by the user.

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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