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Proceedings Paper

Ramsey interferometer, Wigner functions, and controlled-not gates
Author(s): L. Davidovich; L. G. Lutterbach
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Paper Abstract

We show that the technique of Ramsey interferometry may be used to completely determine the quantum state of an electromagnetic field in a cavity. Our method, which allows the direct measurement of the Wigner function of the field, is a useful tool for probing the quantum-classical transition and, in particular, the decoherence between coherent superpositions of distinguishable coherent states of the electromagnetic field in the cavity. We also show that the realization of a controlled-not gate within framework of cavity QED is a special case of our proposal, and leads to the measurement of a negative value for the Wigner function of an electromagnetic field.

Paper Details

Date Published: 25 February 1999
PDF: 9 pages
Proc. SPIE 3736, ICONO '98: Quantum Optics, Interference Phenomena in Atomic Systems, and High-Precision Measurements, (25 February 1999); doi: 10.1117/12.340112
Show Author Affiliations
L. Davidovich, Univ. Federal do Rio de Janeiro (Brazil)
L. G. Lutterbach, Univ. Federal do Rio de Janeiro (Brazil)


Published in SPIE Proceedings Vol. 3736:
ICONO '98: Quantum Optics, Interference Phenomena in Atomic Systems, and High-Precision Measurements

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