Switzerland is currently considered a non-associated 3rd country in terms of the "Horizon Europe" and related programmes and initiatives. Under this status, researchers and innovators in Switzerland can participate in around two thirds of the programme, However, the do not receive any funding from the European Commission. On October 20, 2021, the Swiss Federal Council has released CHF 400 million in funding for project participants in Switzerland (see press release).
The Q&A from SERI (Swiss State Secretariat Education Research and Innovation) provides useful information on Swiss participation in Horizon Europe, Horizon 2020, Partnerships, Digital Europe Programme, Euratom Programme and ITER
Another useful source for information is Euresearch - a Swiss guide to European research and innovation. Their services are free of charge and provide information and guidance on cooperation and funding opportunities offered by “Horizon Europe” and other European partnership initiatives.