# Classical and quantum Malus' law

Source: [Classical and quantum Malus' law](<https://www.sota2.com/research/paper/68fa34531e209131ce8980c5>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T20:36:28.907Z

Authors: K. Wodkiewicz

Published: 1995-02-28T16:22:00.000Z

## Abstract

The classical and the quantum Malus' Laws for light and spin are discussed. It is shown that for spin-1/2, the quantum Malus' Law is equivalent in form to the classical Malus' Law provided that the statistical average involves a quasi-distribution function that can become negative. A generalization of Malus' Law for arbitrary spin-s is obtained in the form of a Feynman path-integral representation for the Malus amplitude. The classical limit of the Malus amplitude for large s is discussed.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/quant-ph/9502028>)

[PDF](<https://arxiv.org/pdf/quant-ph/9502028.pdf>)