Quantum time reference synchronization

It is claimed a method for quantum time reference synchronization, comprising the stepsi) generation of time-energy entangled photon pairs and transmission to a first receiver (3) and a second receiver (4),ii) measurement of the time-energy entangled photon pairs at the two receivers (3, 4) and determination of the correlations of the quantum signal,iii) establishment of a common timing reference synchronization between the two receivers (3, 4). According to the invention, the first receiver (3) sets a synchronization value as a master clock signal by setting the phase, the time, and/or the frequency of the time-energy entangled photon pairs in step ii) and the second receiver (4) is changing the phase, the time, and/or the frequency of the measurement in step ii) in order to determine the synchronization value, and the establishment of a common timing reference synchronization is realized by tracking the correlations.