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arXiv quant-ph/0608098quant-ph
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量子存储器的纠缠保真度

Entanglement fidelity of quantum memories

K. Surmacz, J. Nunn, F. C. Waldermann, Z. Wang, I. Walmsley, D. Jaksch

摘要:

我们引入了一个量子存储器的品质因数,它测量存储在存储器中和从存储器中检索的量子比特与辅助量子比特之间的纠缠的保持。我们考虑一个一般的量子存储系统,由一个介质的两个级别的吸收,与量子比特存储编码在一个单一的光子。我们推导出一个解析表达式,我们的品质因数考虑到高斯波动的哈密顿参数,例如模型非均匀加宽和存储时间退相。最后,我们专注于原子量子存储器的情况下,波动主要来自多普勒展宽和运动退相。

英文摘要:

We introduce a figure of merit for a quantum memory which measures the preservation of entanglement between a qubit stored in and retrieved from the memory and an auxiliary qubit. We consider a general quantum memory system consisting of a medium of two level absorbers, with the qubit to be stored encoded in a single photon. We derive an analytic expression for our figure of merit taking into account Gaussian fluctuations in the Hamiltonian parameters, which for example model inhomogeneous broadening and storage time dephasing. Finally we specialize to the case of an atomic quantum memory where fluctuations arise predominantly from Doppler broadening and motional dephasing.

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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