Final answer:
Identifying the earliest experiment featuring Michelson or Mach-Zender interferometry with optical fibers and single photons generated on demand is complex and requires a specialized academic search outside the scope of this platform.
Step-by-step explanation:
The earliest published experiment featuring Michelson interferometry or Mach-Zender interferometry with optical fibers and the use of single photons generated on demand (for instance, from quantum dots) cannot be precisely determined without an extensive search through academic journals and publications that might be beyond the scope of this platform. Conducting such historical academic literature reviews often requires access to specialized databases and may involve intricate searches, as no standard reference readily gives this specific information.
However, the concepts described are found at the intersection of quantum optics, photonics, and interferometry, and articles involving these research elements are commonly published in journals related to quantum physics and optical engineering. When seeking out the reference for such a pioneering experiment, one might need to look for research papers from the late 20th or early 21st century as these are the periods when the requisite technologies became sufficiently advanced.