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A quantum-nondemolition method to measure the number of photons stored in a high-Q cavity, introduced by Brune et al. [Phys. Rev. Lett. 65, 976 (1990)

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The Rapid Communications section is intended for the accelerated publication of important new results Sin.ce manuscripts submitted to this section are given priority treatment both in the editorial office and in production, authors should explain in their submittal letter why the work justifie this special handling ARa.pid Communication should be no longer than 4 printed pages and must be accompanied by an abstract Page p. roofs are sent to authors.