Multipartite entanglement, such as witnessed through the quantum Fisher information (QFI), is a crucial resource for quantum technologies, but its experimental certification is highly challenging. Here, we propose an experimentally friendly protocol to measure the QFI. It relies on recording the short-time dynamics of simple observables after a quench from a thermal state, works for spins, bosons, and fermions, and can be implemented in standard cold-atom experiments and other platforms with temporal control over the system Hamiltonian. To showcase the protocol, we simulate it for the one-dimensional Fermi-Hubbard model. Further, we establish a family of bounds connecting the QFI to multipartite mode entanglement for fermionic systems, which enable the detection of multipartite entanglement at sizable temperatures. Our work paves a way to experimentally accessing entanglement for quantum enhanced metrology

From entanglement certification with quench dynamics to multipartite entanglement of interacting fermions / Costa de Almeida, Ricardo; Hauke, Philipp. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - ELETTRONICO. - 3:3(2021), pp. L032051-1-L032051-6. [10.1103/PhysRevResearch.3.L032051]

From entanglement certification with quench dynamics to multipartite entanglement of interacting fermions

Costa de Almeida, Ricardo
Primo
;
Hauke, Philipp
Ultimo
2021-01-01

Abstract

Multipartite entanglement, such as witnessed through the quantum Fisher information (QFI), is a crucial resource for quantum technologies, but its experimental certification is highly challenging. Here, we propose an experimentally friendly protocol to measure the QFI. It relies on recording the short-time dynamics of simple observables after a quench from a thermal state, works for spins, bosons, and fermions, and can be implemented in standard cold-atom experiments and other platforms with temporal control over the system Hamiltonian. To showcase the protocol, we simulate it for the one-dimensional Fermi-Hubbard model. Further, we establish a family of bounds connecting the QFI to multipartite mode entanglement for fermionic systems, which enable the detection of multipartite entanglement at sizable temperatures. Our work paves a way to experimentally accessing entanglement for quantum enhanced metrology
2021
3
Costa de Almeida, Ricardo; Hauke, Philipp
From entanglement certification with quench dynamics to multipartite entanglement of interacting fermions / Costa de Almeida, Ricardo; Hauke, Philipp. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - ELETTRONICO. - 3:3(2021), pp. L032051-1-L032051-6. [10.1103/PhysRevResearch.3.L032051]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/315612
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