Ramsey interferometer, Wigner functions, and controlled-not gates

L. Davidovich; L. G. Lutterbach

doi:10.1117/12.340112

25 February 1999 Ramsey interferometer, Wigner functions, and controlled-not gates

L. Davidovich, L. G. Lutterbach

Proceedings Volume 3736, ICONO '98: Quantum Optics, Interference Phenomena in Atomic Systems, and High-Precision Measurements; (1999) https://doi.org/10.1117/12.340112
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

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.

Citation Download Citation

L. Davidovich and L. G. Lutterbach "Ramsey interferometer, Wigner functions, and controlled-not gates", Proc. SPIE 3736, ICONO '98: Quantum Optics, Interference Phenomena in Atomic Systems, and High-Precision Measurements, (25 February 1999); https://doi.org/10.1117/12.340112

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