Contractive states and the standard quantum limit for monitoring free-mass positions

Horace Pak-Hong Yuen*

*Corresponding author for this work

Research output: Contribution to journalArticle

146 Scopus citations

Abstract

The familiar minimum-uncertainty wave packets for masses are generalized in analogy with the two-photon coherent states of the radiation field. The free evolution of a subclass of these states, the contractive states, leads to a narrowing of the position uncertainty in contrast with the usual minimum-uncertainty wave packets. As a consequence the standard quantum limit for monitoring the positions of a free mass can be breached. Further implications on quantum nondemolition measurements are discussed.

Original languageEnglish (US)
Pages (from-to)719-722
Number of pages4
JournalPhysical review letters
Volume51
Issue number9
DOIs
StatePublished - Jan 1 1983

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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