  One of the challenges of quantum technologies is realising the quantum
advantage, predicted for ideal systems, in real applications, which have to
cope with decoherence and inefficiencies. In quantum metrology, sub-shot-noise
imaging (SSNI) and sensing methods can provide genuine quantum enhancement in
realistic situations. However, wide field SSNI schemes realized so far suffer a
trade-off between the resolution and the sensitivity gain over classical
counterpart: small pixels or integrating area, are necessary to achieve high
imaging resolution, but larger pixels allow a better detection efficiency of
quantum correlations, which means a larger quantum advantage. Here we show how
the SSNI protocol can be optimized to significantly improve the resolution
without giving up the quantum advantage in the sensitivity. We show a linear
resolution improvement (up to a factor 3) with respect to the simple protocol
used in previous demonstrations.
