From Memory Alpha, the free Star Trek reference
The photonic cannon destroys a Borg sphere.
The
photonic cannon was an imaginary
weapon of mass destruction, created by the
USS Voyager's
ECH, after he added
daydreaming subroutines to his
program. This weapon was supposedly impervious to all conventional
sensors, and had enough
power to destroy a
Borg sphere with a single volley of two lightning-like energy beams.
The Doctor used the concept of a photonic cannon as a bluff to prevent an attack on Voyager by a Hierarchy starship, with the help of Phlox, who convinced his superior officer about the weapon's awesome power. (VOY: "Tinker Tenor Doctor Spy")
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