In this video, we will discuss the time reversal operator in quantum mechanics. According to Wigner's theorem, physical symmetries in a Hilbert space can be represented mathematically either by unitary operators or by anti-unitary operators. The time reversal operator is a common example of an anti-unitary operator. Contents: 00:00 Definition 01:00 Example 02:00 Reversal of motion If you want to help us get rid of ads on YouTube, you can become a member... ...or support us on Patreon! Thanks for your support! :)