Quantum Mirror

The Quantum Mirror is a device which allows people to travel into different realities and was created by unknown aliens.

Functions
The Quantum Mirror is centrally activated by a control device. After activation the mirror shows what is opposite the mirror of another reality. When a person touches the mirror, he/she is engulfed in energy and transported to the other reality. Switching between realities is possible by using the control device. SG-1 discovered the Mirror on P3R-233, though the device itself was created by unknown aliens.

History
The device is found on P3R-233 by Daniel Jackson, who upon touching it is transported through the Quantum Mirror into an alternate reality where he finds that Earth is about to be overrun by a Klingon invasion force. Just before the alternate Stargate Command is destroyed, Daniel escapes into his reality. Afterwards the mirror is transported to Earth and stored in Area 52.