INL, Sapienza University of Rome, CNR-INF and Politecnico di Milano, have recently published a new study that demonstrates how to certify several quantum properties of devices of increasing complexity. The paper was published on November 3rd in the journal Science Advances (full publication here).
Programmable optical circuits are one of the leading architectures for quantum information processing. They enable tests of key aspects of quantum mechanics, and they have various applications in fields like metrology, cryptography, and computation.
These devices handle information in a non-traditional way, using quantum states of light. As programmable optical circuits become larger and more complex, there is an increasing need for reliable methods to confirm their quantum capabilities and determine the most effective ways to use them for information processing.