Entangled Fock states for Robust Quantum Optical Metrology, Imaging, and Sensing

Details Entangled Fock states for Robust Quantum Optical Metrology, Imaging, and Sensing Entangled Fock states for Robust Quantum Optical Metrology, Imaging, and Sensing

2008-05-02

arxiv.org/abs/0805.0296v2

Phys. Rev. A 78, 063828 (2008)

Physics

Quantum Physics

4 pages, 5 figures, extended introduction and minor revisions

Scientific paper

10.1103/PhysRevA.78.063828

We propose a class of path-entangled photon Fock states for robust quantum optical metrology, imaging, and sensing in the presence of loss. We model propagation loss with beam-splitters and derive a reduced density matrix formalism from which we examine how photon loss affects coherence. It is shown that particular entangled number states, which contain a special superposition of photons in both arms of a Mach-Zehnder interferometer, are resilient to environmental decoherence. We demonstrate an order of magnitude greater visibility with loss, than possible with N00N states. We also show that the effectiveness of a detection scheme is related to super-resolution visibility.

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