Quantum transducer


 * For the Torchwood episode, see Ghost Machine (Torchwood story).

The Quantum transducer or ("Ghost Machine") allowed Humans a form of mental time travel.

History

 * The Transducer came to 21st century by unknown means, presumably via the Cardiff Rift.

Ed Morgan acquired the machine (perhaps by finding it, perhaps by obtaining it off somebody else) and then Sean "Bernie" Harries, a small-time fence in grey market alien artefacts filched it out of a biscuit tin in Morgan's flat.

Torchwood 3 acquired the machine by tracing alien energy signals from the device while still in Harries' possession. After a chase that led her to a train station, Gwen Cooper ended up with Harries' hoody, which contained in its pocket the machine. There she mentally time-slipped back in time and saw a ghost from World War II, not a phantom in the conventional sense, but a quantum echo of the long-ago emotional state of a living person, Thomas Flanagan. The other half of the machine, also at Bernie's, snapped in neatly with the first and picked up visions of the future.



The Ghost Machine eventually was put away with other dangerous alien artefacts in Torchwood 3. (TW: Ghost Machine)

Technology
The Transducer used nanotechnology. It converted the quantum traces of emotional events, both past and future, into a form that Humans could mentally experience them. (TW: Ghost Machine) Jack believed that it worked as a navigational device for travelers across the dimensions who would use quantum traces to orient the flight of their craft. (torchwood.org.uk)


 * According to Jack, the machine only showed possible futures that might nor might not come to pass. In practice the visions the machine relayed all did come true.

When activated, apparently by touching the buttons on the front, the user is shown a emotional event from the past or future. As well as showing the actual event, the Ghost Machine also transmitted the thoughts of the people in the event. (TW: Ghost Machine)


 * When the events were seen, more negative events were shown darker and and less colourful, whereas positive events were shown brighter and more vibrant. This may suggest the events were colour-coded for the emotional states.