Travelers from EU countries can visit Poland without undergoing its mandatory 10-day quarantine "on the basis of a certificate confirming vaccination against Covid-19."
The European country lifted restrictions for arrivals who've been fully vaccinated on December 28.
Those who provide a negative SARS‑CoV‑2 test on arrival are also exempt as long as there's no more than 48 hours between the time they receive their test result and the time they cross the border.
Poland tourist visa is not required for citizens of Switzerland for a stay up to 90 days.
Check with your airline in case you have connecting flights overseas as part of your journey to Poland. It may be the case that countries you pass through en route to your destination may require a separate transit visa. Please refer to visa requirements of the specific country.