Concurrence in quantum computing refers to how much two particles are "entangled" with each other. Imagine two toy cars that are connected by a string. If you push one car forward, the other car moves backward at the same time. This is a bit like how two particles can become entangled in quantum computing.
Now, imagine you have two toy cars that are connected by a string, but the string is tangled up and they can't move in synchronization anymore. This is kind of like how two entangled particles can become "unentangled" or lose their concurrence.
In quantum computing, researchers are interested in maximizing the concurrence between particles to perform certain operations, like breaking cryptographic codes or simulating chemical reactions. By understanding how to manipulate concurrence, scientists hope to harness quantum computing's unique properties to solve complex problems beyond what traditional computers can do.