Agradecimentos: In memory of Max Broszio. Authors would like to acknowledge the financial support from the Swiss National Science Foundation (grant nos. 200020-149713, 206021-121461, 206021-113149, 206021-144991, and 200020-153549) and the National Centre of Competence in Research "Nanoscience" (NCCR-Nano, project "Nanoscale Science"), Swiss Nano science Institute (SNI) (project nos. P1204 and P1203), Marie Curie Research Training Network PRAIRIES (grant no. MRTN-CT-2006-035810), Norwegian University of Science and Technology, Research Council of Norway through its Centres of Excellence funding scheme (project no. 262633, "QuSpin") and through the Fripro program (project no. 250985 "FunTopoMat"), MAX-lab, Swedish Research Links initiative of the Swedish Research Council (348-2012-6196), the Swedish Research Council project no. 2014-5993, the San Paulo Research Foundation (grant no. 2013/04855-0), Swiss Government Excellence Scholarship Program (grant no. 2013.0942), Netherlands Organization for Scientific Research NWO (Chemical Sciences, VIDI-grant no. 700.10.424), the European Research Council (ERC-2012-StG 307760-SURF-PRO), the Hundred Talents project of the Chinese Academy of Sciences, Knut and Alice Wallenberg Foundation, Commission for Technology and Innovation (CTI) contract no. 16464.1 PFNM-NM, University of Basel, ETH Zurich, University Research Priority Program LightChEC of the University of Zurich, University of Groningen, Swiss Light Source, Wolfermann Naegeli Foundation, and Paul Scherrer Institute. The research of M.N.A. is implemented within the framework of the Action Supporting Postdoctoral Researchers of the Operational Program "Education and Lifelong Learning" (Action's Beneficiary: General Secretariat for Research and Technology) co-financed by the European Social Fund (ESF) and the Greek State. The computations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at National Supercomputer Centre (NSC) at Linkoping University. We sincerely thank M. Martina for technical support Ver menos

Abstract: Quantum devices depend on addressable elements, which can be modified separately and in their mutual interaction. Self-assembly at surfaces, for example, formation of a porous (metal-) organic network, provides an ideal way to manufacture arrays of identical quantum boxes, arising in this case from the confinement of the electronic (Shockley) surface state within the pores. We show that the electronic quantum box state as well as the interbox coupling can be modified locally to a varying extent by a selective choice of adsorbates, here C-60, interacting with the barrier. In view of the wealth of differently acting adsorbates, this approach allows for engineering quantum states in on-surface network architectures Ver menos