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arXiv quant-ph/0211127quant-ph
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纠缠辅助的量子态工程

Quantum state engineering assisted by entanglement

Matteo G. A. Paris, Mary Cola, Rodolfo Bonifacio

摘要:

提出了一种基于纠缠双光束条件测量的量子态工程的一般方案。详细分析了{ \sc on/off}光电探测、零差探测和双模积分联合测量等实用探测方案。考虑了装置的非单位量子效率和有限分辨率等缺陷。我们发现,有条件的{ \sc开/关}光电探测提供了一个可靠的方案来验证非经典性,而有条件的零差表示一个可调的和强大的压缩光源。我们还将光隐形传态描述为一种有条件的测量,并评估了有限量的纠缠、由于损耗引起的退相干和非单位量子效率对量子隐形传态的影响。

英文摘要:

We suggest a general scheme for quantum state engineering based on conditional measurements carried out on entangled twin-beam of radiation. Realistic detection schemes such as {\sc on/off} photodetection, homodyne detection and joint measurement of two-mode quadratures are analyzed in details. Imperfections of the apparatuses, such as nonunit quantum efficiency and finite resolution, are taken into account. We show that conditional {\sc on/off} photodetection provides a reliable scheme to verify nonclassicality, whereas conditional homodyning represents a tunable and robust source of squeezed light. We also describe optical teleportation as a conditional measurement, and evaluate the degrading effects of finite amount of entanglement, decoherence due to losses, and nonunit quantum efficiency.

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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