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Perovskite quantum dots (PQDs) provide a robust solution-based approach toefficient solar cells, bright light-emitting devices, and quantum sources oflight. Quantifying heterogeneity and understanding coupling between dots iscritical for these applications. We use double-nanohole optical trapping tosize individual dots and correlate to emission energy shifts from quantumconfinement. We were able to assemble a second dot in the trap, which allows usto observe the coupling between dots. We observe a systematic red-shift of 1.1$\pm$ 0.6 meV in the emission wavelength. Theoretical analysis shows that theobserved shift is consistent with resonant energy transfer and is unusuallylarge due to moderate-to-large quantum confinement in PQDs. This demonstratesthe promise of PQDs for entanglement in quantum information applications. Thiswork enables future in situ control of PQD growth as well as studies of thecoupling between small PQD assemblies with quantum information applications inmind.

Coupling Perovskite Quantum Dot Pairs in Solution using Nanoplasmonic Assembly