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arXiv 1708.06642quant-ph
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Laser熵

Laser Entropy

Marlan Scully

摘要:

计算了普通激光(光子)和原子激光(玻色凝聚)的熵。特别地,得到了工作在阈值附近的单模激光或脉塞的非零熵。这个结果可以与在研究微波激射器热机时经常出现的说法相比较,这种说法大意是:“因为微波激射器辐射处于纯态,所以它的熵为零。“同样地,玻色-爱因斯坦凝聚体(又名玻色-爱因斯坦凝聚体)的基态熵也是如此。原子激光器)也是第一次计算。这与教科书上的智慧相比较,教科书上的智慧认为:“凝聚的粒子.在动量空间中凝聚成一组静止的粒子零能量和零熵。"

英文摘要:

The entropy of an ordinary (photon) laser and an atom laser (Bose condensate) is calculated. In particular, the nonzero entropy of a single mode laser or maser operating near threshold is obtained. This result is to be compared with the statement frequently made in the study of the maser heat engine to the effect that: "because maser radiation is in a pure state, its entropy is zero." Similarly, the entropy of the ground state of a Bose-Einstein condensate (a.k.a. the atom laser) is also calculated for the first time. This is to be compared with the textbook wisdom which holds that: "The condensed particles ... are condensed in momentum space, a set of stationary particles ... having zero energy and zero entropy."

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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