Robust Hamiltonian engineering with subensemble control

Invited Talk

Pulsed control is an established technique to decouple and reshape interactions in experimental quantum systems. While pulsed control with local addressing enables the engineering of arbitrary quantum dynamics and computation, it also implies an often unpractical control overhead. In this talk, we present a robust protocol to reshape interactions in spin ensembles based on global control pulse sequences applied to multiple subensembles in parallel. This setting arises naturally from ensembles of solid-state defects or multi-species atomic arrays. We prove that subensemble control allows to engineer a much wider range of Hamiltonians than global control. Moreover, we introduce efficient numerical strategies for designing pulse sequences that engineer target Hamiltonians robust against common control imperfections. As a specific application, we discuss the robust generation of two-mode spin squeezing in dual-species atomic ensembles, which is a challenging task without subensemble control.

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