Loschmidt echo for quantum metrology

Year: 2016

Authors: Macri t., Smerzi A., Pezze L.

Autors Affiliation: Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, Natal, RN, Brazil;‎ Int Inst Phys, Natal, RN, Brazil; INO CNR, QSTAR, Largo Enrico Fermi 6, I-50125 Florence, Italy;‎ LENS, Largo Enrico Fermi 6, I-50125 Florence, Italy

Abstract: We propose a versatile Loschmidt echo protocol to detect and quantify multiparticle entanglement. It allows us to extract the quantum Fisher information for arbitrary pure states, and finds direct application in quantum metrology. In particular, the protocol applies to states that are generally difficult to characterize, as non-Gaussian states, and states that are not symmetric under particle exchange. We focus on atomic systems, including trapped ions, polar molecules, and Rydberg atoms, where entanglement is generated dynamically via long-range interaction, and show that the protocol is stable against experimental detection errors

Journal/Review: PHYSICAL REVIEW A

Volume: 94 (1)      Pages from: 010102-1  to: 010102-6

KeyWords: MULTIPARTICLE ENTANGLEMENT; FISHER INFORMATION; GENERATION; HUNDREDS; STATES; ATOMS
DOI: 10.1103/PhysRevA.94.010102

Citations: 91
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