Work

Collective three-body interactions enable a robust quantum speedup

Year: 2026

Type: article

Abstract: We show that collective three-body interactions (3BIs), implementable with N atoms loaded inside an optical cavity, offer a significant advantage for preparing complex multipartite entangled states. First, they enable a speedup of order ∼ N in preparing generalized Greenberger-Horne-Zeilinger states, outperforming conventional methods based on all-to-all two-body Ising interactions. Second, they saturate the Heisenberg bound in phase estimation tasks using a time-reversal protocol realized through simple rotations and followed by experimentally accessible collective spin measurements. Finally, compared with two-body interactions, in the presence of cavity losses and single particle decoherence, 3BIs feature a high gain in sensitivity for moderate atom numbers and in large ensembles a fast entanglement generation despite constraints in parameter regimes where they are implementable.

Source: Physical Review Research

DOI: 10.1103/2pg6-vd1j