Entanglement Detection with Fewer Measurements based on the Geometric Criterion

Abstract

We present a new technique to reduce the expected number of measurements to declare an unknown quantum state as entangled. Our method is based on the geometric criterion and so requires only local Pauli measurements. Using concentration of measure, we provide a heuristic which allows us to reinterpret a previous decision tree algorithm due to Laskowski et al and that forms the basis for our new algorithm. Numerical simulations show that for three to six qubits we use fewer measurements than either the trivial algorithm or the decision tree algorithm. In addition, our method is easy to construct, assumes no prior knowledge of the system and works for any number of qubits.