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EPJ Quantum Technology
Figure 3 | EPJ Quantum Technology

Figure 3

From: The deep space quantum link: prospective fundamental physics experiments using long-baseline quantum optics

Figure 3

A simplified MZI for quantum optical COW tests. The source node and receiver node are at different heights h measured along the direction of the gravity vector g⃗. Each node has a long optical delay line of length l. Note that this is equivalent to the arrangement with two unbalanced MZIs shown in Fig. 2, which allows photons emitted at different times to propagate along essentially the same spatial mode (modulo whatever lateral shift has occurred due to the motion of the source in the time between the early and late emission times)

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