Accelerating many-body entanglement generation by dipolar interactions in the Bose-Hubbard model

Yanes, Tanausú Hernández; Płodzień, Marcin; Gajda, Mariusz; Lewenstein, Maciej; Witkowska, Emilia

doi:10.1103/physreva.107.013311

Cited by 10 publications

(1 citation statement)

References 60 publications

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“…It is therefore an important problem to characterize the buildup of quantum entanglement in such systems, beyond the paradigm of biparatite entanglement entropies as typically considered in most works in the field. In the context of quantum spin systems and Hubbard models, several theoretical works have shown that spin-squeezing [251][252][253][254][255][256][257] and other classes of entangled [257] and Bell-correlated states [253] are produced at short time by the out-of-equilibrium dynamics. At the same time, in more general situations the structure of entanglement as well as the suitable entanglement criteria are not known beforehand, and the problem offers a challenge where data-driven methods applied either to numerical simulations (as illustrated in [130]) or to experimental quantum simulation data could find a natural avenue of applications.…”

Section: Probing Entanglement In Topological Phasesmentioning

confidence: 99%

Probing quantum correlations in many-body systems: a review of scalable methods

Frérot,

Fadel,

Lewenstein

2023

Rep. Prog. Phys.

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We review methods that allow one to detect and characterize quantum correlations in many-body systems, with a special focus on approaches which are scalable. Namely, those applicable to systems with many degrees of freedom, without requiring a number of measurements or computational resources to analyze the data that scale exponentially with the system size. We begin with introducing the concepts of quantum entanglement, Einstein–Podolsky–Rosen steering, and Bell nonlocality in the bipartite scenario, to then present their multipartite generalization. We review recent progress on characterizing these quantum correlations from partial information on the system state, such as through data-driven methods or witnesses based on low-order moments of collective observables. We then review state-of-the-art experiments that demonstrate the preparation, manipulation and detection of highly-entangled many-body systems. For each platform (e.g. atoms, ions, photons, superconducting circuits) we illustrate the available toolbox for state preparation and measurement, emphasizing the challenges that each system poses. To conclude, we present a list of timely open problems in the field.

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Section: Probing Entanglement In Topological Phasesmentioning

confidence: 99%

Probing quantum correlations in many-body systems: a review of scalable methods

Frérot,

Fadel,

Lewenstein

2023

Rep. Prog. Phys.

Self Cite

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Introduction to Quantum Entanglement in Many-Body Systems

Srivastava,

Müller-Rigat,

Lewenstein

et al. 2024

Lecture Notes in Physics

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Metrological robustness of high photon number optical cat states

Stammer,

Fernández Martos,

Lewenstein

et al. 2024

Quantum Sci. Technol.

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In the domain of quantum metrology, cat states have demonstrated their utility despite their inherent fragility with respect to losses. Here, we introduce noise robust optical cat states which exhibit a metrological robustness for phase estimation in the regime of high photon numbers. These cat states are obtained from the intense laser driven process of high harmonic generation (HHG), and show a resilience against photon losses. Focusing on a realistic scenario including experimental imperfections we opt for the case in which we can maximize the lower bound of the quantum Fisher information (QFI) instead of analyzing the best case scenario. We show that the decrease of the QFI in the lossy case is suppressed for the HHG-cat state compared to the even and odd counterparts. In the regime of small losses of just a single photon, the HHG-cat state remains almost pure while the even/odd cat state counterparts rapidly decohere to the maximally mixed state. More importantly, this translates to a significantly enhanced robustness for the HHG-cat against photon loss, demonstrating that high photon number optical cat states can indeed be used for metrological applications even in the presence of losses.

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Accelerating many-body entanglement generation by dipolar interactions in the Bose-Hubbard model

Cited by 10 publications

References 60 publications

Probing quantum correlations in many-body systems: a review of scalable methods

Probing quantum correlations in many-body systems: a review of scalable methods

Introduction to Quantum Entanglement in Many-Body Systems

Metrological robustness of high photon number optical cat states

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