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Entanglement has long stood as one of the characteristic features of quantummechanics, yet recent developments have emphasized the importance ofquantumness beyond entanglement for quantum foundations and technologies. Wedemonstrate that entanglement cannot entirely capture the worst-casesensitivity in quantum interferometry, when quantum probes are used to estimatethe phase imprinted by a Hamiltonian, with fixed energy levels but variableeigenbasis, acting on one arm of an interferometer. This is shown by defining abipartite entanglement monotone tailored to this interferometric setting andproving that it never exceeds the so-called interferometric power, a quantitywhich relies on more general quantum correlations beyond entanglement andcaptures the relevant resource. We then prove that the interferometric powercan never increase when local commutativity-preserving operations are appliedto qubit probes, an important step to validate such a quantity as a genuinequantum correlations monotone. These findings are accompanied by aroom-temperature nuclear magnetic resonance experimental investigation, inwhich two-qubit states with extremal (maximal and minimal) interferometricpower at fixed entanglement are produced and characterized.

There is more to quantum interferometry than entanglement