In Star Trek, what device compensates for quantum uncertainty during transporter operation?

In Star Trek, the Heisenberg compensator compensates for quantum uncertainty during transporter operation.

The transporter converts a person or object into an energy pattern, transmits that pattern, and reconstructs it elsewhere. Real-world quantum mechanics makes that process impossible as portrayed, so the Heisenberg compensator is the fictional component that addresses the uncertainty problem. The name is a reference to Werner Heisenberg's uncertainty principle.

The compensator is not the same as the transporter pattern buffer. The pattern buffer temporarily stores a scanned matter pattern, while the Heisenberg compensator is associated with maintaining transporter accuracy. Star Trek usually treats the device as an accepted engineering solution rather than explaining its circuitry.

The term became a memorable example of technobabble: it sounds scientifically grounded while remaining fictional. It is also why transporter scenes can present precise materialization as routine, despite the enormous information and physical challenges such a process would involve.