Это вот Federal Foreign office https://www.auswaertiges-amt.de/en/coronavirus/2317268 :

Quarantine regulations

According to the new specimen regulation, the following applies as a rule:

Upon entry to Germany following a stay in a risk area, high incidence area or virus variant area within the last ten days, you must

• register at www.einreiseanmeldung.de before entering the country and carry proof of having done so with you,
• be tested for infection with the SARS-CoV-2 coronavirus before or immediately after entering the country,
• proceed directly to your destination following entry and
• self-isolate there for ten days (quarantine).

А вот Federal Ministery of Health https://www.bundesgesundheitsministerium.de/coronavirus/cu...

• During the quarantine period, you are not allowed to leave your house or apartment, nor receive guests. Please do not forget that these measures are meant to protect your family, neighbours and all other persons around you. Non-compliance with the quarantine rules can be penalised by fine!
• Home quarantine can in general be lifted earlier with a negative test result, at the earliest after five days. Please check the quarantine rules for your Federal Land to see which regulations apply to you