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arXiv:quant-ph/0105129 · Foundations of Physics

Non-Classical Behavior of Atoms in an Interferometer

Lepša Vušković, D. Arsenović, Mirjana Božić

Published Sep 1, 2002• 2 citations
arXivHTMLPDF
DOI
10.1023/a:1020365405788

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We propose an enhanced optical interferometer based on tailored non-classical light generated by nonlinear dynamics and projective measurements in a three-level atom cavity QED system. A coherent state in the cavity becomes dynamically entangled with two ground states of the atom and is transformed to a macroscopic superposition state via a projective measurement on the atom. We show that the resulting highly non-classical state can improve interferometric precision measurements well beyond the shot-noise limit once combined with a classical laser pulse at the input of a Mach–Zehnder interferometer. For a practical implementation, we identify an efficient phase shift estimation scheme based on the counting of photons at the interferometer output. Photon losses and photon-counting errors deteriorate the interferometer sensitivity, but we demonstrate that it still can be significantly better than the shot-noise limit under realistic conditions.
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