For SPAQUA (SPAnish QUantum Alice) an I+D project financed through the public-private partnership call of the Ministry of Science, Innovation and Universities, we are collaborating with the Institute of Physical and Information Technologies “Leonardo Torres Quevedo” (ITEFI), part of the CSIC. SPAQUA will allow us to advance in the field of quantum key exchange and quantum cryptography (QKD) and participate in the development of secure and decentralized communication networks in the future.