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arXiv quant-ph/0703059quant-ph
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利用多量子比特单光子态实现无对准量子通信

Quantum communication without alignment using multiple-qubit single-photon states

L. Aolita, S. P. Walborn

摘要:

我们提出了一种利用单光子的偏振和横向空间自由度在子空间中编码逻辑量子比特的方案,该子空间可以防止围绕传播轴的集体旋转。这种编码允许量子密钥分发而不需要共享的参考系。我们提出了利用当前的下转换光源和线性光学产生两个逻辑量子比特纠缠态的方法,并表明这些纠缠逻辑态的量子信息方案的应用允许贝尔不等式,量子密集编码和量子隐形传态的无干扰测试。

英文摘要:

We propose a scheme for encoding logical qubits in a subspace protected against collective rotations around the propagation axis using the polarization and transverse spatial degrees of freedom of single photons. This encoding allows for quantum key distribution without the need of a shared reference frame. We present methods to generate entangled states of two logical qubits using present day down-conversion sources and linear optics, and show that the application of these entangled logical states to quantum information schemes allows for alignment-free tests of Bell's inequalities, quantum dense coding and quantum teleportation.

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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