Quantum theory of field-quadrature measurements

Wiseman, H. M. and Milburn, G. J. (1993) Quantum theory of field-quadrature measurements. Physical Review A, 47 1: 642-662. doi:10.1103/PhysRevA.47.642

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Author Wiseman, H. M.
Milburn, G. J.
Title Quantum theory of field-quadrature measurements
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 1993-01-01
Year available 1993
Sub-type Article (original research)
DOI 10.1103/PhysRevA.47.642
Open Access Status File (Publisher version)
Volume 47
Issue 1
Start page 642
End page 662
Total pages 21
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Subject 3100 Physics and Astronomy
3107 Atomic and Molecular Physics, and Optics
Abstract The quantum effects on a cavity mode of the electromagnetic field caused by measuring one of its quadrature components is analyzed. We consider three measurement schemes: an intracavity quantum-nondemolition coupling to another mode, simple homodyne detection, and balanced homodyne detection. It is shown that, for suitable initial conditions, the first scheme has an effect which approaches that of a projective collapse of the state vector for long measurement times. However, the two homodyne schemes (which are shown to be equivalent for large local-oscillator amplitudes) do not approximate a projective measurement in any limit. In particular, it is shown that homodyne measurement cannot produce a squeezed state from a classical initial state. All three schemes are analyzed in terms of ‘‘quantum trajectories’’ which link measurement theory with stochastic quantum-jump processes.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Optics
Physics
OPTICS
PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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