When Starfleet began experimenting with very small weapons delivery systems, it became apparent that an alternative launching method would be required to equip these systems with quantum torpedoes. The result was an enhanced version of the quantum torpedo.

The EQT is identical to a standard quantum torpedo, with the addition of a 1.5 meters of additional length. This additional length is a booster module. This booster module includes a quantum flywheel for power and a variable geometry warp propulsion unit with retractable nacelles. Even when launched from a sublight velocity, an EQT can accelerate to warp 9.9999 or more in just four nanoseconds. The booster module contains the additional computing power and sensor capability necessary for it to target and strike at ranges of up to 1 standard astronomical unit.

The booster stage of an EQT is designed as a "bolt-on" enhancement of a standard quantum torpedo. The diameter of the EQT remains unaltered from a standard quantum torpedo, and it may be fired from most standard torpedo launchers with simple modifications easily performed at a starbase.

The EQT's design includes a "loiter" mode. In this mode, the EQT acts as a mine. It is deployed in the desired location and remains in "standby" (power conservation) mode. When the on-board sensors detect a pre-programmed target, the computer orders the EQT to orient and fire upon the target vessel.