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arXiv quant-ph/0509107quant-ph
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laser光的量子性质

Quantum nature of laser light

David T. Pegg, John Jeffers

摘要:

混合态密度算符的所有组成对于预测未来测量结果的概率是等价的。然而,对于追溯,情况并非如此。量子力学的追溯形式主义提供了一个判断某些作品是否虚构的标准。虚构组合物不包含准备设备操作符,即对应于可能已经准备好的状态的操作符。我们将此应用到莫尔默的有争议的猜想,即激光中的光学相干性是一个虚构的,并找到与他的猜想协议。我们概括了莫尔默的推导两个激光器之间的干扰,以避免使用任何虚构的国家。我们还研究了另一种可能的方法来区分激光的相干态和光子数态,发现它不起作用,与预测的等效性保存纠缠。

英文摘要:

All compositions of a mixed-state density operator are equivalent for the prediction of the probabilities of future outcomes of measurements. For retrodiction, however, this is not the case. The retrodictive formalism of quantum mechanics provides a criterion for deciding that some compositions are fictional. Fictional compositions do not contain preparation device operators, that is operators corresponding to states that could have been prepared. We apply this to Molmer's controversial conjecture that optical coherences in laser light are a fiction and find agreement with his conjecture. We generalise Molmer's derivation of the interference between two lasers to avoid the use of any fictional states. We also examine another possible method for discriminating between conerent states and photon number states in laser light and find that it does not work, with the equivalence for prediction saved by entanglement.

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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