Figure 2From: The deep space quantum link: prospective fundamental physics experiments using long-baseline quantum opticsSimplified scheme of the optical COW experiment in space. A time-bin superposition is generated by injecting a single photon wavepacket into a unbalanced MZIs. The photon is sent towards a satellite, where an identical MZI is located. Interference detected at the satellite reveals the gravitationally induced phase shiftBack to article page