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Laser-based quantum computers are now a thing

A network of laser beams passing through the entangled cluster state made of mirrors, beamsplitters and fiber optics. (Source: Shota Yokoyama)
A network of laser beams passing through the entangled cluster state made of mirrors, beamsplitters and fiber optics. (Source: Shota Yokoyama)
Current qubit-based quantum computers are still too large and not really scalable, but the new laser-based approach allows for a highly-scalable model that can eventually achieve quantum supremacy just by splitting laser beams into "squeezable light."

Today’s quantum computers from IBM and Google make use of the qubit model, which apparently is not really that scalable at this point in time. Even though Google claims that its 53-qubit computer achieved quantum supremacy over binary computers, this may only be true for a limited set of applications. In order for a quantum computer to really prove itself superior over current binary models, its design requires universality, scalability and increased fault tolerance.
 
While current qubit-based quantum computers are seeing increased fault tolerance, their scaling potential is severely reduced due to the already large components. A better alternative was revealed on October 18 with the announcement of a laser-based quantum computer, which has been in development for almost 10 years.
 
The team behind the laser-based quantum computer includes scientists from the U.S., Australia and Japan. Instead of qubits, the new approach uses a clustered state made of laser beams and custom-made crystals that convert the beams into a special type of light called “squeezed light.” For the cluster state to exhibit quantum computational potential, the laser needs to be measured in a specific way, and this is achieved through a quantum entangled network of mirrors, beamsplitters and optical fibers.
 
This approach was demonstrated at small scales, which does not provide high enough computational speeds, but the scientists claim that the model is extremely scalable and larger structures could eventually achieve quantum supremacy over the qubit and binary models.

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2019 10 > Laser-based quantum computers are now a thing
Bogdan Solca, 2019-10-23 (Update: 2019-10-23)
Bogdan Solca
Bogdan Solca - News Editor
I stepped into the wonderous IT&C world when I was around 7. I was instantly fascinated by computerized graphics, be them from games or 3D applications like 3D Max. I like to keep myself up to date with all the new technologies that get released at an ever increasing rate these days. I'm also an avid SciFi reader, an astrophysics aficionado and, as of late, a crypto geek.