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We investigate quantum key distribution (QKD) in opticalmultiple-input-multiple-output (MIMO) settings. Such settings can prove usefulin dealing with harsh channel conditions as in, e.g., satellite-based QKD. Westudy a $2\times2$ setting for continuous variable (CV) QKD with Gaussianencoding and heterodyne detection and reverse reconciliation. We present ourkey rate analysis for this system and compare it with single-mode andmultiplexed CV QKD scenarios. We show that we can achieve multiplexing gainusing multiple transmitters and receivers even if there is some crosstalkbetween the two channels. In certain cases, when there is nonzero correlatedexcess noise in the two received signals, we can even surpass the multiplexinggain.

Continuous Variable Quantum Key Distribution in Multiple-Input Multiple-Output Settings