Work

Loschmidt echo for quantum metrology

Year: 2016

Type: article

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.

Source: Physical Review A

DOI: 10.1103/physreva.94.010102

Authors: Tommaso Macrì, Augusto Smerzi, Luca Pezzè

Institutions: Universidade Federal do Rio Grande do Norte, Quantum Science and Technology in Arcetri

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Conselho Nacional de Desenvolvimento Científico e Tecnológico

Award: G920865450