Measuring quantum state overlaps of traveling optical fields

OPTICS COMMUNICATIONS

卷:179

Article

Clausen, J ; Dakna, M ; Knöll, L ; Welsch, DG

关键词: conditional measurement;    quantum state engineering;    beam splitter array;    quantum phase distribution;    Schrodinger-cat-like states;   

DOI  :  10.1016/S0030-4018(99)00537-4

来源: Elsevier

【 摘 要 】

We propose a detection scheme for measuring the overlap of the quantum state of a traveling-field mode with a reference quantum state that is an arbitrary superposition of a finite land under realistic conditions small) number N of Fock states, \Psi]= Sigma(n)(N)=(0)c(n)\ n]. In the scheme, an array of maximally N beam splitters is used in which the signal mode is successively mixed with modes prepared in coherent states and photon-number measurements are performed. To illustrate the method, we discuss the measurement of the quantum phase and the detection of Schrodinger-cat-like states. (C) 2000 Elsevier Science B.V. All rights reserved.

【 授权许可】

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