In our current understanding of physics, entropy is a measure of the disorder or randomness in a system. It is always a positive quantity or zero, according to the second law of thermodynamics. The second law states that the entropy of an isolated system can never decrease over time and tends to increase.
Antimatter, which consists of antiparticles with properties opposite to those of normal matter, follows the same fundamental laws of physics as regular matter. Therefore, it is expected to have positive entropy, just like normal matter. The behavior of antimatter is governed by the same thermodynamic principles and the second law of thermodynamics.
While it is theoretically possible to manipulate the entropy of a system by carefully controlling its energy states and configurations, it is highly unlikely that antimatter itself would possess negative entropy. Such a scenario would require a significant departure from our current understanding of thermodynamics and the laws of physics. there is no scientific evidence or theoretical framework suggesting that antimatter can have negative entropy.