Generating entangled states of continuous variables via cross-Kerr nonlinearity

We propose a scheme for generating entanglement of quantum states with continuous variables (coherent states and squeezed vacuum states) of electromagnetical fields. The scheme involves cross-Kerr nonlinearity. It was shown that the cross-Kerr nonlinearity required for generating the superposition a...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-05, Vol.40 (10), p.1917-1924
Main Authors: Zhang, Zhi-Ming, Khosa, Ashfaq H, Ikram, Manzoor, Zubairy, M Suhail
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonclassical field states
squeezed, antibunched and sub-poissonian states
operational definitions of the phase of the field
phase measurements
Nonlinear optics
Optics
Phase conjugation, optical mixing
photorefractive and kerr effects
Physics
Quantum optics
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Summary:We propose a scheme for generating entanglement of quantum states with continuous variables (coherent states and squeezed vacuum states) of electromagnetical fields. The scheme involves cross-Kerr nonlinearity. It was shown that the cross-Kerr nonlinearity required for generating the superposition and entanglement of squeezed vacuum states is smaller than that required for coherent states. It was also found that the fidelity monotonously decreases with both the increase of the amplitude of the input coherent field and the increase of the deviation of the nonlinear phase shift from pi.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/40/10/024