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The quantum statistical fluctuations of the electromagnetic field establish alimit, known as the shot-noise limit, on the sensitivity of opticalmeasurements performed with classical technologies. However, quantumtechnologies are not constrained by this shot-noise limit. In this regard, thepossibility of using every photon produced by quantum sources of light toestimate small physical parameters, beyond the shot-noise limit, constitutesone of the main goals of quantum optics. Here we experimentally demonstrate ascalable protocol for quantum-enhanced optical phase estimation across a broadrange of phases, with neither pre- nor post-selected measurements. This isachieved through the efficient design of a source of spontaneous parametricdown-conversion in combination with photon-number-resolving detection. Therobustness of two-mode squeezed vacuum states against loss allows us tooutperform schemes based on N00N states, in which the loss of a single photonis enough to remove all phase information from a quantum state. In contrast toother schemes that rely on N00N states or conditional measurements, thesensitivity of our technique could be improved through the generation anddetection of high-order photon pairs. This unique feature of our protocol makesit scalable. Our work is important for quantum technologies that rely onmultiphoton interference such as quantum imaging, boson sampling and quantumnetworks.

Scalable multiphoton quantum metrology with neither pre- nor post-selected measurements