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Quantum theory is often presented as the theory describing the microscopicworld, and admittedly, it has done this extremely well for decades.Nonetheless, the question of whether it applies at all scales and in particularat human scales remains open, despite considerable experimental effort. Here,we report on the displacement of quantum entanglement into the domain where itinvolves two macroscopically distinct states, i.e. two states characterised bya large enough number of photons to be seen, at least in principle, with oureyes and that could be distinguished using mere linear - coarse-grained -detectors with a high probability. Specifically, we start by the generation ofentanglement between two spatially separated optical modes at the single photonlevel and subsequently displace one of these modes up to almost a thousandphotons. To reliably check whether entanglement is preserved, the mode isre-displaced back to the single photon level and a well establishedentanglement measure, based on single photon detection, is performed. Theability to displace an entangled state from the micro to the macro domain andback again provides a fascinating tool to probe fundamental questions aboutquantum theory and holds potential for more applied problems such as quantumsensing.

Displacing entanglement back and forth between the micro and macro domains