Quantum-enhanced interferometry with cavity QED-generated non-classical light

  • 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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Author:Karol Gietka, Tomasz Wasak, Jan Chwedeńczuk, Francesco PiazzaORCiDGND, Helmut Ritsch
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/108378
Parent Title (English):The European Physical Journal D
Publisher:Springer Science and Business Media LLC
Year of first Publication:2017
Publishing Institution:Universität Augsburg
Release Date:2023/10/16
Tag:Atomic and Molecular Physics, and Optics
First Page:273
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Theoretische Physik III
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):CC-BY 4.0: Creative Commons: Namensnennung (mit Print on Demand)