  Fiber-based bidirectional photon extraction from nanoscale emitters and
photon antibunching behavior between two outputs of two single mode optical
fibers are experimentally demonstrated. Flakes of the epitaxial layer
containing the InAs quantum dots (QDs) are fixed mechanically by both side with
the edge faces of the single-mode-fiber (SMF) patch cables. The emitting
photons from the single quantum dot are directly taken out of both side through
the SMFs. Single-photon emission between two SMF outputs is confirmed by
detecting non-classical antibunching in second-order photon correlation
measurements with two superconducting single-photon detectors (SSPDs) and a
time-amplitude converter (TAC). This simple opto-mechanical alignment-free
single-photon emitter has advantage of robust stability more than 10 days and
low-cost fabrication.
