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- About Quandela: Quandela is a European deeptech scale-up building modular, scalable and energy-efficient photonic and spin-optical quantum computers.  Our quantum computing platform is accessible both through the cloud and on-premises.  With a team of more than 140 people, we develop our own hardware and software stack, from semiconductor quantum emitters and photonic processors to quantum control systems and quantum algorithms.  Our ambition is to build large-scale fault-tolerant quantum computers capable of solving problems beyond the reach of classical computation using Quandela's cutting-edge quantum dot technology.  Achieving this vision requires not only advances in photonic quantum computing, but also the development of scalable spin-photon interfaces, distributed entanglement capabilities and future SPOQC (Spin-Optical Quantum Computing) architectures that will enable modular and fault-tolerant quantum systems.  - About this position: You will join Quandela's Semiconductor Optics Team, a multidisciplinary group combining expertise in quantum optics, spin physics, semiconductor technologies, electronics and quantum information.  The team develops the building blocks required for future hybrid spin-photon quantum computing architectures, bridging quantum science, technology development and product-oriented demonstrators. In this role, you will contribute to the development and validation of photon-mediated spin–spin entanglement protocols while improving the performance of spin-based quantum systems.  Current challenges include enhancing spin coherence against decoherence, validating high-fidelity spin qubit operations, developing advanced optical control techniques and strengthening theory-to-experiment feedback loops for future multi-spin architectures.  Beyond the scientific challenges, you will contribute to building demonstrators that will directly become part of future quantum computing platforms. Success in this role relies on combining scientific rigor, collaboration across Quandelas production and research departments.  - What you'll do: As a Quantum Optics Scientist, you will contribute to the development of spin-based quantum technologies supporting Quandela's longterm quantum computing roadmap. Your work will include:  Design, develop and improve  optical experiments involving spin-photon sources .  Develop and implement optical control schemes for spin initialization, readout and characterization .  Characterize key spin properties including coherence, operation fidelity and entanglement quality.  Collaborate with theory, electronics and semiconductor technology teams to improve device performance and accelerate experimental progress.  Contributing to the development and validation of photon-mediated spin–spin entanglement protocols  and future multi-spin architectures .  Validate and translate scientific advances into robust technological building blocks for future hybrid quantum computing systems.  - How You Will Grow: During your first 3 months  You will become familiar with Quandela's experimental platforms, spin-control techniques and&n