Quantum superpositions generated by quantum nondemolition measurements

B. Yurke; W. Schleich; D. F. Walls

doi:10.1103/PhysRevA.42.1703

Quantum superpositions generated by quantum nondemolition measurements

B. Yurke
, W. Schleich
, D. F. Walls

Max-Planck-Instiẗt für Quantenoptik
The University of Auckland

Research output: Contribution to journal › Article › peer-review

156 Scopus citations

Abstract

We analyze a quantum nondemolition measurement scheme similar to that advocated by Song, Caves, and Yurke [Phys. Rev. A 41, 5261 (1990)] for generating superpositions of macroscopically distinct quantum states, but with the parametric amplifier and the back-action evader interchanged. We determine the asymptotic behavior of the output and obtain the conditions under which a superposition of two coherent states is approached. By presqueezing the signal port input, we find that gain requirements of the back-action evader are much less demanding.

Original language	English
Pages (from-to)	1703-1711
Number of pages	9
Journal	Physical Review A
Volume	42
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevA.42.1703
State	Published - 1990

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Quantum superpositions generated by quantum nondemolition measurements

Abstract

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