Secure data transmission in healthcare-based Wireless Body Area Networks (WBANs) is increasingly vulnerable in the face of advancing quantum computing. Quantum Key Distribution (QKD) offers a solution, but its implementation in resource-constrained WBANs requires highly efficient and reliable single-photon sources. This work addresses a critical bottleneck in such sources: the inefficient population of excited states in quantum emitters like semiconductor quantum dots under conventional off-resonant excitation. We propose the Swing-UP of the quantum Emitter population (SUPER) scheme, a coherent control technique using frequency-modulated, highly-detuned pulses to achieve near-complete population inversion, resulting in single photons with high purity and indistinguishability. Crucially, we extend this physical-layer advancement to the system level by formulating a joint optimization framework for the photon source and Quantum Error Correction (QEC). This co-design methodology is essential for mitigating the high bit-error rates in lossy WBAN channels, enabling the practical realization of secure Quantum WBANs for next-generation medical applications.