# Does the Pauli exclusion principle apply to one fermion and one antifermion?

I understand that two fermions cannot simultaneously have the same <momentum, spin> state. I know this is also true of two anti-fermions. But is it possible for one fermion and one anti-fermion to occupy the same state?

• p is usually a proton, not a positron. If you want to abbreviate, you should probably use $e^-$ and $e^+$. Jan 6, 2021 at 21:57