The USS Defiant firing quantum torpedoes, armed with plasma warheads

A plasma warhead was a plasma explosive inside quantum torpedoes utilized by the Starfleet starships. (DS9: "For the Uniform")

In 2372, Captain Sisko ordered Chief O'Brien to rig the Defiant's two atmospheric probes with warheads from the ship's quantum torpedoes. (DS9: "Starship Down")

According to Star Trek: Deep Space Nine Technical Manual, the Starfleet quantum torpedoes are armed with a quantum warhead that rapidly extracts the explosive energy from zero-point vacuum. Upon the detonation of a quantum torpedo, a photon torpedo warhead, enriched with fluoronetic vapor, detonates inside the torpedo and powers a continuum distortion emitter that pinches out a membrane from the background vacuum. The membrane forms into subatomic particles accompanied by a high-explosive energy release.

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