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Quantum-nondemolition measurements using ghost transitions

Abstract : We present a detailed analysis of the quantum-nondemolition (QND) properties of a measurement scheme employing coherently driven three-level atoms in the Λ or cascade configuration inside an optical cavity. We propose to use a strong signal field to empty one of the transitions and dress the signal-transition levels. The atoms become transparent for the signal beam, which sees a ''ghost transition.'' When a probe is applied and tuned to the vicinity of one of the light-shifted levels, the probe phase is extremely sensitive to fluctuations of the signal intensity. This enhances the QND coupling and enables the system to operate at lower cooperativities.
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Klaus M. Gheri, Philippe Grangier, Jean-Philippe Poizat, Daniel F. Walls. Quantum-nondemolition measurements using ghost transitions. Physical Review A, American Physical Society, 1992, 46, pp.4276-4285. ⟨10.1103/PhysRevA.46.4276⟩. ⟨hal-00559005⟩

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