Freezing Light.

[Rorschach]

Australian scientists just froze light like Kylo Ren from Star Wars
Rae Johnston

Physicists at The Australian National University (ANU) have brought quantum computing a step closer to reality by stopping light in a new experiment.

Lead researcher Jesse Everett said controlling the movement of light was critical to developing future quantum computers, which could solve problems too complex for today's most advanced computers.

"Optical quantum computing is still a long way off, but our successful experiment to stop light gets us further along the road," Everett said.

He said quantum computers based on light — photons — could connect easily with communication technology such as optic fibres and had potential applications in fields such as medicine, defence, telecommunications and financial services.

The research team's experiment — which created a light trap by shining infrared lasers into ultra-cold atomic vapour — was inspired by Everett's discovery of the potential to stop light in a computer simulation.

"It's clear that the light is trapped, there are photons circulating around the atoms," Everett said. "The atoms absorbed some of the trapped light, but a substantial proportion of the photons were frozen inside the atomic cloud."

Everett likened the team's experiment at ANU to a scene from Star Wars: The Force Awakens when the character Kylo Ren used the Force to stop a laser blast mid-air.

"It's pretty amazing to look at a sci-fi movie and say we actually did something that's a bit like that," he said.

Associate Professor Ben Buchler, who leads the ANU research team, said the light-trap experiment demonstrated incredible control of a very complex system.

"Our method allows us to manipulate the interaction of light and atoms with great precision," said Buchler.

Co-researcher Dr Geoff Campbell from ANU said photons mostly passed by each other at the speed of light without any interactions, while atoms interacted with each other readily.

"Corralling a crowd of photons in a cloud of ultra-cold atoms creates more opportunities for them to interact," said Campbell.

"We're working towards a single photon changing the phase of a second photon. We could use that process to make a quantum logic gate, the building block of a quantum computer," Campbell said.

[Neferti]

Freezing Light?

Can you explain that to a mere female, please?

I did TRY to read Sci-Fi but my mind doesn't work that way.

[freediver]

This is what happens if you close the freezer door really quickly.

[Neferti]

This is what happens if you close the freezer door really quickly.

I didn't know you THOUGHT you had a sense of humour, Freediver.

[Super Nova]

Freezing Light?

Can you explain that to a mere female, please?

I did TRY to read Sci-Fi but my mind doesn't work that way.

What they are staying is:
- We need control of light to be able to build quantum computers, that is a computer based on light running through the circuit rather than electrons (electricity)
- They have managed to stop a light photon (A single particle of light)
- They did this by trapping it around an atom, imagine the light particle circling an atom and not moving on (however it is not a particle in the normal sense). Some of the energy of this particle is absorbed by the atom.

This means they can control a photon and build light transistors that are used for computing and it can be switched, redirected. Stopping and controlling the flow through light will be important to set a clock I also think for such a computer, needed to control computer instructions, IMO.

In summary, bloody good discovery verifying what they modelled in a computer. A step closer to computers that will be so fast it will be scary.