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The Einstein Equivalence Principle (EEP) is of crucial importance to test thefoundations of general relativity. When the particles involved in the testexhibit quantum properties, it is unknown whether this principle still holds. Aviolation of the EEP would have drastic consequences for physics. A moreconservative possibility is that the EEP holds in a generalised form fordelocalised quantum particles. Here we formulate such a generalised EEP byextending one of its paradigmatic tests with clocks to quantum clocks that arein a quantum superposition of positions and velocities. We show that thevalidity of such a generalised version of the EEP is equivalent to thepossibility of transforming to the perspective of an arbitrary QuantumReference Frame (QRF), namely a reference frame associated to the quantum stateof the clock. We further show that this generalised EEP can be verified bymeasuring the proper time of entangled clocks in a quantum superposition ofpositions in the Earth gravitational field. The violation of the generalisedEEP corresponds to the impossibility of defining dynamical evolution in theframe of each clock, and results in a modification to the probabilities ofmeasurements calculated in the laboratory frame. Hence, it can be verifiedexperimentally, for instance in an atom interferometer.

Quantum generalisation of Einstein's Equivalence Principle can be verified with entangled clocks as quantum reference frames