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Fiber-based bidirectional photon extraction from nanoscale emitters andphoton antibunching behavior between two outputs of two single mode opticalfibers are experimentally demonstrated. Flakes of the epitaxial layercontaining the InAs quantum dots (QDs) are fixed mechanically by both side withthe edge faces of the single-mode-fiber (SMF) patch cables. The emittingphotons from the single quantum dot are directly taken out of both side throughthe SMFs. Single-photon emission between two SMF outputs is confirmed bydetecting non-classical antibunching in second-order photon correlationmeasurements with two superconducting single-photon detectors (SSPDs) and atime-amplitude converter (TAC). This simple opto-mechanical alignment-freesingle-photon emitter has advantage of robust stability more than 10 days andlow-cost fabrication.

Bidirectional photon extraction from an epitaxially grown semiconductor quantum dot sandwiched by single mode optical fibers