Once the subsystems interact, their states have become correlated or entangled and it is no longer possible to consider them independent of one another.
The subsystems states have become correlated or entangled and it is no longer possible to consider them independent of one another. Once the subsystems interact, their states are no longer independent.
Once the subsystems interact, their states are no longer independent. The subsystems states have become correlated or entangled and it is no longer possible to consider them independent of one another.
Once the subsystems interact, their states are no longer independent. The subsystems states have become correlated or entangled and it is no longer possible to consider them independent of one another.