Quantum Torpedoes were first developed in the Alpha Quadrant by the United Federation of planets to replace the common photon torpedo, and they use much of the same technology as a traditional photon warhead with the exception of the addition of a zero point energy tap. It is this new feature of quantum torpedo design that allows these explosives easily surpass the destructive output of their total conversion predecessors.

This may, at first, appear to violate the laws of energy conservation, as the instantaneous translation of matter into energy as which occurs in a photon torpedo explosion extracts the maximum energy possible from the reactants. The secret power of the quantum torpedo, however, lies not in the torpedo itself, but instead its ability to unlock finite amounts of energy from the zero point of the space in it's surrounding area.

In order to understand the operation of the quantum torpedo, a cursory explanation of zero point energy must be provided. As it turns out, even as matter is cooled to temperatures of absolute zero, there remains a residual energy field around all matter and throughout the universe known as classical electromagnetic zero point energy. It is this ubiquitous energy field that a quantum torpedo taps into and converts into explosive energy, enabling it to readily release more energy than it's component parts have the potential to generate. The zero point energy tap, or ZPE tap, which is the heart of the quantum torpedo, is triggered by a controlled matter/anti-matter total conversion reaction analogous to the triggering explosion of a nuclear bomb. In a nuclear explosive, the secondary explosion provides sufficient compression of the fissile material to reach a critical density and trigger a nuclear chain reaction. Similarly, in a quantum torpedo, the secondary matter/anti-matter explosion provides enough "energy compression" for a short-lived particle to be created, through which a finite amount of zero point energy is introduced into normal space. This energy manifests itself in an explosion of much greater magnitude than would be produced by an uncontrolled matter/anti-matter detonation.

Originally a StarFleet-exclusive technology, plans for the quantum torpedo design were scanned at least once by operatives of the Obsidian Order, and as a result, the Cardassians have managed to develop a significantly less advanced version of the warhead for inclusion in their Dreadnought-Class drone missiles.

Like their cousin, the photon torpedo, quantum torpedoes display a distinctive glowing effect, often seen as shining pearls of blue or white; a result of a high-output shield system which is activated upon the torpedo's launch. The energy shield provides some protection against interstellar particulates and provides partial penetration power against enemy shields. It was this energy field which helped the quantum and photon torpedoes launched at the skirmish at Imatia to pass unimpeded through the deflector screens of Sher Khal'Saad's star destroyers. This problem, like the similar issue which occurred with StarFleet phasers, has since been rectified by Imperial engineers.

Typically, quantum torpedoes carry subspace and/or realspace target acquisition, autonomous guidance and sensor equipment, maneuvering equipment and a low-level passive warp field generator. The latter allows these projectile weapons to be effectively utilized at hyper-light speeds. They are often launched by electromagnetic or gravity railguns and are small enough to be relatively difficult to target by even FTL computer tracking systems.