{{Quantum Infobox
| image = FileRosenberg portal.jpg|250px
| image2 = FileCombine teleport3.jpg|250px
| image3 = FileChell momentum.jpg|250px
| name = Teleportation
| type = Inter-dimensional transfer of matter
| affiliation =
* Black Mesa
* Aperture Science
* Xen
* Race X
* Resistance
* Combine
| usedby =
* Black Mesa Science Team|Black Mesa scientists
* Gordon Freeman
* The G-Man
* Adrian Shephard
* All CategoryXen creatures|Xen creatures
* All CategoryRace X creatures|Race X creatures
* Barney Calhoun
* Rosenberg
* Walter Bennet
* Simmons
* Gina Cross
* Colette Green
* Alyx Vance
* Eli Vance
* Judith Mossman
* Wallace Breen
* Aperture Science technicians
* Chell
* ATLAS and P-body
| entity =
| designer=Scott Klintworth (''Portal'')http// Scott Klintworth's personal website
| hidei =
| hideu =
| hideg = yes
{{Quote|You mean it's working? For real, this time? Because I still have nightmares about that cat.|Barney Calhoun|Half-Life 2|FileBa itsworking.ogg}}

'''Teleportation''',''Half-Life'' '''portals''',''Portal''  '''displacements''',''Half-Life Opposing Force''  or '''quantum space holes''',{{YouTube|wYQ75ge3ezk|Aperture Investment Opportunity #4 "Boots"}} are a means of transferring matter between two locations or dimensions, regardless of their proximity. It is the central and most pivotal Themes|theme of the Half-Life and Portal universe|''Half-Life'' and ''Portal'' universe.

== Overview ==
Teleportation is achieved by use of devices able to create a portal, which connects together two gateways of departure and arrival, allowing an object entering one gateway to leave via the other. It is achieved instantaneously. 

The portal appearances and generations may vary depending on the technology used

*They are created by two fixed devices called "teleports"''''Half-Life 2.html">Half-Life''''Half-Life 2'' located at each point. The term "teleporter" is only used by Rosenberg, and only in ''Blue Shift''. Its only other appearance is in the description of the "What cat?" The Orange Box Achievements 2|Achievement in ''Half-Life 2''; the term "transporter" is also used once, by the scientist trapped by Pit Drones in Sector E in ''Opposing Force''. The portals generated by fixed teleports appear as yellow/green/orange/purple orbs floating in mid-air and visible at any time (Black Mesa, Xen, Race X) or purple/blue swirls visible only when used (the Resistance, the Combine).
*Non-visible arrival teleports, allowing to transfer objects at any location and appearing as green lightning only when used (Xen's Warpball).
*Portable teleports usable like a weapon, allowing their user to freely create departure and arrival portals. Black Mesa's Displacer Cannon allows to teleport from Black Mesa to various Xen locations, but it cannot send back the user to Earth, requiring the weapon to always teleport to a location where a portal is already present. Aperture Science's Aperture Science Handheld Portal Device is able to "shoot" portals appearing as orange and blue ovals on most surfaces, as long as both surface targets are in the user's sight.

=== Black Mesa ===
FileLambdaTeleportationSystem.jpg|Portals in the Lambda Reactor Core in the Lambda Complex.|left|200px|thumb

Teleportation was a major field of study at Black Mesa, and their portals were used primarily in the procurement of Xen crystals, as they were used to transport scientists to and from the Borderworld for research and analysis via the Sector F Portal Device|Dimensional Portal Device located in the Sector F Reactor Complex|Lambda Reactor Complex. The portals can be used to travel between Xen and Earth; however, portals that allow for travel within the same dimension can be found across the facility, notably in the Sector F Reactor Core|Lambda Reactor Core, which contains nine portals, three on each of its three levels. Both Gordon Freeman and Barney Calhoun traveled to Xen through such a teleport, and to escape from the Black Mesa Research Facility|Black Mesa facility before its destruction. The Displacer Cannon, found and used by Adrian Shephard, can also allow for dimensional travels.

During his brief visit to Xen, Barney is also required to activate and calibrate a "focal point", which was then used by Doctor Rosenberg to teleport several members of the science team outside of Black Mesa.

=== Aperture Science ===
FileTestchmb17.jpg|Orange and blue portals created by Chell with the ASHPD.|left|200px|thumb

Research into the portal technology by Aperture Science focused upon travel within the same dimension. Portal technology was discovered with far more ease, and far earlier, than at Black Mesa, with the technology appearing as early as the 1950s in the form of the Aperture Science Handheld Quantum Tunnelling Device, which was eventually streamlined into the far more portable Aperture Science Handheld Portal Device. The ASHPD, or "Portal Gun", was used as a quick method of travel over potentially unlimited distances. Through the use of the Portal Gun, Chell, one of Aperture's Test Subjects, could make objects appear to exist in two locations simultaneously.

These portals follow a more simplified portal style, where light is able to enter the portal and send an image of both sides. They also allow for a more instantaneous transit between the portals, as it is simply a matter of walking in and appearing out of the other one. The ability to place them on any flat surface with holes or a Moon rock surface to attach a portal to makes these much more versatile and efficient than their Black Mesa counterparts. A surface fit to receive a portal is said to be "portalable".

=== Resistance and Combine ===
FileD1 trainstation Alyx.jpg|right|thumb|200px|Alyx Vance about to be sent to Black Mesa East through Kleiner's Lab teleport.

During the Combine occupation of Earth, the Resistance was able to develop new advancements in portal technology that allowed for single-dimensional travel. The Combine, developing alongside the Resistance, were able to make developments, however were still unable to discover the means of single-dimension teleportation (due to their inability to factor in the Dark Energy equations), and were forced to use much slower and conventional means of transportation if they wanted to stay within a single dimension.

The teleport in Kleiner's Lab was perfected upon Gordon Freeman|Gordon's arrival in City 17, and it was inaugurated by Alyx Vance, who had a successful transit to Black Mesa East. However, being fragile, the teleport was damaged by Lamarr during Gordon's attempt, and he was, instead, teleported right outside of the lab and forced to join Black Mesa East on foot after being spotted by the Combine. 

The Resistance's discovery was major, as it put them one stride ahead of the Combine in the fight for Earth. It must be noted however, that human-made portals are able to accomplish this feat by using the dimensional borderworld Xen as a relay; in the words of Judith Mossman, "we figured out how to use Xen as an unexpressed axis, effectively a dimensional slingshot so we can swing around the borderworld and come back to local space without having to pass through".
This method of using an "Unexpressed Axis" centered on Xen removes the need to travel through it or to use a focusing device (like the one activated by Barney Calhoun), but instead use a modulator to emulate its effects.

Additionally, teleports are used to supply Freeman with Magnusson Devices during the Combine raid on White Forest. These teleports are smaller and portable, allowing them to be placed in the surrounding wilderness and regularly replenished with the devices.

The Combine also housed their own teleport in the Depot, where it is seemingly used for transporting prisoners. When Alyx and Gordon visit Nova Prospekt to rescue Eli Vance, they are required to use this teleport to return to Kleiner's Lab. This plan is waylaid, however, as Judith Mossman uses it to transport Eli to the Citadel. When the teleport is finally recharged, Alyx and Gordon end up in City 17 a week later. 

Using a different technology than that of the Resistance teleports, the Combine were able to covertly work on same-dimensional travel, however the device was not able to teleport large masses, and required a long time to recharge. As oppose to the "slingshot" method, they used "string-based" technology.

==== Superportal ====
FileSuperportal.jpg|thumb|left|200px|Superportal above the destroyed Citadel.

As its name suggests, this is a considerably larger portal, capable of transporting much larger volumes of matter over greater distances. It is also able to generate Portal Storms, used only to destruct the Superportal's greater surroundings.

When Alyx and Gordon escape from City 17 during the Portal Storms, they see in the distance the remains of the Citadel, and the infant Superportal, which was said if it were to open, would allow Combine units to sweep in and recapture Earth. However, Superportals take a while to gain strength and eventually open.

=== Xen ===
FileXen first teleport1.jpg|right|thumb|200px|Teleport on Xen.

Xen creatures are also able to use portals to travel between worlds; after the Resonance Cascade, they can be seen teleporting in and out of the Black Mesa Research Facility. Their ability to do so made their siege on Black Mesa all the more easy, as they were able to teleport into almost all areas of the facility. During the events of ''Half-Life 2'', they cannot be seen using portals to travel to Earth.

Xen also features several small monolithic teleports and portals, as well as a larger teleport leading to Nihilanth's lair. These teleports have three prongs, and (besides the one leading to Nihilanth's chamber, which holds a rift similar to the one that the Anti-Mass Spectrometer created) generates a beam of energy, again similar to the Spectrometer, onto what seems to be a small Xen Crystal shard. 

Along side the Xen creatures' technology, Nihilanth can also naturally generate portals, most likely able to be formed by the Xen Crystal in his head.

After Gordon is trapped in stasis by the G-Man, just before the destruction of the Citadel's core, he is rescued by numerous Vortigaunts, who teleport him away from the G-Man's hold and Alyx from the top of the Citadel, to the base. Vortigaunts seem to be able to teleport only when in contact with the Antlion's extract, assumed by the purple hued glow they gain from it.

=== Race X ===
FileSprites xen.jpg|thumb|right|200px|Sprites flying from a Race X purple portal on Xen

Race X creatures seemed to have mastered teleportation technology, even with single units teleporting at will. Sprites also seem to power Race X portals, and seen powering the Gene Worm's portal to Earth. The difference is that their portals are purple rather than green.

== Gallery ==
=== ''Half-Life'' and its Expansions ===
==== Pre-release ====

FileTeleport out sillhouette.jpg|Early portal appearance in which a scientist teleports while another watches and then gets scared.
FileLambda Reactor Core beta.jpg|Early teleports in an early Sector F|Lambda Reactor Core.

==== Retail ====

FileCascade1.jpg|Vortigaunt being teleported in Test Lab C-33/a during the Resonance Cascade. 
FileC3a2c0002.jpg|The G-Man teleporting out of the Lambda Complex.
FileSector F teleport.jpg|The Lambda Complex teleport, also known as the Dimensional Portal Device.
FileTeleport Nihilanth.jpg|The teleport leading to Nihilanth's lair.
FileG-Man portal dam.jpg|The G-Man about to teleport through a portal near Sector G's Hydro-Electric Plant.
FileWe Are Not Alone 3.jpg|Gordon Freeman teleporting to Xen from Sector F.
FileSprites xen.jpg|Race X portal on Xen, from which flow Sprites.
FileDisplacer first 2.jpg|Scientist falling from a portal on Xen with the Displacer Cannon.
FileDisplacer w.jpg|The Displacer Cannon.
FileGene Worm enters.jpg|The Gene Worm coming through its portal in Sector E.
FileChumtoad teleport.jpg|Chumtoads teleporting on Xen.
FileRosenberg is pleased.jpg|The Section A-17 Prototype Labs teleport.
FileBa xen60003.jpg|Barney Calhoun about to teleport from Xen through a portal.
FileRosenberg portal.jpg|Rosenberg about to teleport out of Black Mesa through a portal.

=== ''Half-Life 2'' and its Episodes ===

FileD1 trainstation 050031.jpg|Kleiner's usable mini teleport.
FileKleiner teleport idle.jpg|The teleport in Kleiner's Lab.
FileBme teleport.jpg|The teleport in Black Mesa East.
FileCombine teleport1.jpg|The Combine teleport in the lower levels of the Depot.
FileCombine teleport2.jpg|Ditto.
FileCombine teleport3.jpg|Ditto.
FileAlyx vorts intervention.jpg|Alyx Vance about to be teleported out of the Citadel by the Vortigaunts.
FileDm steamlab.jpg|The teleport in the ''Half-Life 2 Deathmatch'' map ''Steam Lab''.

=== ''Portal'' series ===

FilePortal gun fh.jpg|The Aperture Science Handheld Portal Device|Portal Device.
FileChell momentum.jpg|Chell falling through her own portals.

== List of appearances ==
* ''Half-Life Day One'' {{1st}}
* ''Half-Life''
* ''Half-Life Opposing Force''
* ''Half-Life Blue Shift''
* ''Half-Life Decay''
* ''Half-Life 2''
* ''Half-Life 2 Raising the Bar''
* ''Half-Life 2 Deathmatch'' {{Nc}}
* ''Half-Life 2 Episode One''
* ''Portal''
* ''Half-Life 2 Episode Two''
* ''Portal First Slice''
* ''Portal Still Alive'' {{Nc}}
* Portal ARG|''Portal'' ARG
* PotatoFoolsDay ARG|''PotatoFoolsDay'' ARG
* ''Portal 2 Lab Rat''
* ''Portal 2''
* ''The Final Hours of Portal 2''
*''Peer Review''
*''Portal Pinball'' {{Nc}}
*''Lego Dimensions'' {{Nc}}

== See also ==
{{Imagecat|Teleportation images}}

* Superportal
* Resonance Cascade

== References ==

== External links ==
*{{YouTube|moWfNWbhYGs|Early teleportation sequence for ''Half-Life''}}

{{Black Mesa}}
{{Race X}}
CategoryHalf-Life Opposing Force
CategoryHalf-Life Blue Shift
CategoryHalf-Life Decay
CategoryHalf-Life 2
CategoryHalf-Life 2 Episode One
CategoryHalf-Life 2 Episode Two
CategoryPortal 2
CategoryQuantum events
CategoryRecurring themes
CategoryResistance technology
CategoryCombine technology
CategoryBlack Mesa technology
CategoryAperture Science technology
CategoryXen technology
CategoryResistance transportation
CategoryCombine transportation
CategoryBlack Mesa transportation
CategoryAperture Science transportation
CategoryXen transportation
CategoryRace X transportation