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Quantum-nondemolition measurements using ghost transitions

By Klaus M. Gheri, Philippe Grangier, Jean-Philippe Poizat and Daniel F. Walls


International audienceWe 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

Topics: [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]
Publisher: 'American Physical Society (APS)'
Year: 1992
DOI identifier: 10.1103/PhysRevA.46.4276
OAI identifier: oai:HAL:hal-00559005v1

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