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Recent years have seen remarkable advances in the quantum technologies based on and making use of quantum optical systems. This progress begs for a good answer to the question: How can the components be actually certified in their functioning? Quantum state and process tomography may allow to determine an unknown quantum state and process from data alone. Yet, the scaling of the effort to do so is daunting, and gives rise to an infeasible prescription already for moderately sized systems. This state of affairs constitutes a road block in the further development of the quantum technologies.
© 2017 Optical Society of America
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