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Entanglement is a key ingredient for quantum technologies and a fundamentalsignature of quantumness in a broad range of phenomena encompassing many-bodyphysics, thermodynamics, cosmology, and life sciences. For arbitrarymultiparticle systems, entanglement quantification typically involvesnontrivial optimisation problems, and may require demanding tomographicaltechniques. Here we develop an experimentally feasible approach to theevaluation of geometric measures of multiparticle entanglement. Our approachprovides analytical results for particular classes of mixed states of N qubits,and computable lower bounds to global, partial, or genuine multiparticleentanglement of any general state. For global and partial entanglement, usefulbounds are obtained with minimum effort, requiring local measurements in justthree settings for any N. For genuine entanglement, a number of measurementsscaling linearly with N is required. We demonstrate the power of our approachto estimate and quantify different types of multiparticle entanglement in avariety of N-qubit states useful for quantum information processing andrecently engineered in laboratories with quantum optics and trapped ion setups.

Accessible quantification of multiparticle entanglement