Instantaneous measurement of field quadrature moments and entanglement |
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Authors: | P Lougovski H Walther E Solano |
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Institution: | (1) Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany;(2) Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Lima, Peru |
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Abstract: | We present a method of measuring expectation values of quadrature
moments of a multimode field through two-level probe
“homodyning”. Our approach is based on an integral transform
formalism of measurable probe observables, where analytically
derived kernels unravel efficiently the required field information
at zero interaction time, minimizing decoherence effects. The
proposed scheme is suitable for fields that, while inaccessible to
a direct measurement, enjoy one and two-photon Jaynes-Cummings
interactions with a two-level probe, like spin, phonon, or cavity
fields. Available data from previous experiments are used to
confirm our predictions. |
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Keywords: | 42 50 Dv Nonclassical states of the electromagnetic field including entangled photon states quantum state engineering and measurements 03 67 Mn Entanglement production characterization and manipulation 42 50 Lc Quantum fluctuations quantum noise and quantum jumps |
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