Abstract
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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Gietka, K., Wasak, T., Chwedeńczuk, J. et al. Quantum-enhanced interferometry with cavity QED-generated non-classical light. Eur. Phys. J. D 71, 273 (2017). https://doi.org/10.1140/epjd/e2017-80235-2
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DOI: https://doi.org/10.1140/epjd/e2017-80235-2