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We demonstrate electro-mechanical control of an on-chip GaAs optical beamsplitter containing a quantum dot single-photon source. The beam splitterconsists of two nanobeam waveguides, which form a directional coupler (DC). Thesplitting ratio of the DC is controlled by varying the out-of-plane separationof the two waveguides using electro-mechanical actuation. We reversibly tunethe beam splitter between an initial state, with emission into both outputarms, and a final state with photons emitted into a single output arm. Thedevice represents a compact and scalable tuning approach for use in III-Vsemiconductor integrated quantum optical circuits.

Electro-mechanical control of an on-chip optical beam splitter containing an embedded quantum emitter