Karol Życzkowski (born 1960) is a Polish physicist and mathematician.
He worked as a Humboldt Fellow at the University of Essen (1989–1990) and as senior Fulbright Fellow at the University of Maryland, College Park (1996/97).
In 2005/06 visiting scientist at the Perimeter Institute, Waterloo (Ontario).
[2] Życzkowski was a member of the Commission on European Matters PAU created by the Polish Academy of Learning.
Życzkowski has contributed to quantum chaos, quantum measurement, entropy, and entanglement,[3][4] the theory of voting [5] and jointly with Wojciech Słomczyński[6] designed the Jagiellonian Compromise - a voting system for the Council of the European Union.