Title: Electro-mechanical control of an on-chip optical beam splitter containing an embedded quantum emitter,
Abstract: We demonstrate electro-mechanical control of an on-chip GaAs optical beam
splitter containing a quantum dot single-photon source. The beam splitter
consists of two nanobeam waveguides, which form a directional coupler (DC). The
splitting ratio of the DC is controlled by varying the out-of-plane separation
of the two waveguides using electro-mechanical actuation. We reversibly tune
the beam splitter between an initial state, with emission into both output
arms, and a final state with photons emitted into a single output arm. The
device represents a compact and scalable tuning approach for use in III-V
semiconductor integrated quantum optical circuits.