In Star Trek: Voyager, what technology creates a stable shortcut through normal space?

In Star Trek: Voyager, a spatial trajector creates a stable shortcut through normal space.

A spatial trajector is a transport technology associated with the Sikarians in Star Trek: Voyager. It opens a spatial distortion that can transfer matter over a very large distance, effectively creating a shortcut rather than requiring a starship to cross the intervening space at warp speed. Voyager encounters the technology in the episode “Prime Factors.”

The device is not a conventional transporter pad and does not simply move someone across a room or between nearby locations. Its importance comes from its extraordinary range, which makes it potentially valuable to a ship stranded far from home. Voyager's crew hopes to use it to reduce the journey back to the Alpha Quadrant.

Spatial trajectors are also distinct from wormholes and transwarp corridors. Those terms describe other kinds of shortcuts in Star Trek, while the trajector is a specific Sikari technology with its own operating limitations and political consequences.