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arXiv quant-ph/0406118quant-ph
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利用偏振纠缠光子对实现稳健的量子通信

Robust Quantum Communication Using A Polarization-Entangled Photon Pair

J. -C. Boileau, R. Laflamme, M. Laforest, C. R. Myers

摘要:

噪声和实际器件的不完美性是实现量子密码的主要障碍。特别地,光纤中的双折射导致光子偏振中编码的量子比特的退相干。我们展示了如何通过在没有共享空间参考系和精确定时的情况下进行单量子比特量子通信来克服这个问题。量子信息将使用对应于偏振模式之一的时间延迟的“标签”操作被编码在光子对中。尽管使用时间仓,该方法对干涉仪的相位不稳定性是鲁棒的。此外,在理想情况下,没有光子损失的情况下,不需要同步时钟,因为它们只需要标记不同的编码量子位。

英文摘要:

Noise and imperfection of realistic devices are major obstacles for implementing quantum cryptography. In particular birefringence in optical fibers leads to decoherence of qubits encoded in polarization of photon. We show how to overcome this problem by doing single qubit quantum communication without a shared spatial reference frame and precise timing. Quantum information will be encoded in pair of photons using ``tag'' operations which corresponds to the time delay of one of the polarization modes. This method is robust against the phase instability of the interferometers despite the use of time-bins. Moreover synchronized clocks are not required in the ideal situation no photon loss case as they are only necessary to label the different encoded qubits.

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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