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Researchers have revealed a radical experiment that can stop light - and could one day lead to optical computers.
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.
'Optical quantum computing is still a long way off, but our successful experiment to stop light gets us further along the road,' said lead researcher Jesse Everett from the Research School of Physics and Engineering (RSPE) and ARC Centre of Excellence for Quantum Computation and Communication Technology at the Australian National University.
The research team's experiment - which created a light trap by shining infrared lasers into ultra-cold atomic vapour - was inspired by Mr 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,' Mr Everett said.
'The atoms absorbed some of the trapped light, but a substantial proportion of the photons were frozen inside the atomic cloud.'
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 Associate Professor Buchler from RSPE and ARC Centre of Excellence for Quantum Computation and Communication Technology at ANU.
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 Dr Campbell from RSPE and ARC Centre of Excellence for Quantum Computation and Communication Technology at ANU.
'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,' Dr Campbell said.
http://phys.org/news/2016-09-quantum-closer-reality.html
A little light reading....
A little light interaction leaves quantum physicists beaming
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.
'Optical quantum computing is still a long way off, but our successful experiment to stop light gets us further along the road,' said lead researcher Jesse Everett from the Research School of Physics and Engineering (RSPE) and ARC Centre of Excellence for Quantum Computation and Communication Technology at the Australian National University.
The research team's experiment - which created a light trap by shining infrared lasers into ultra-cold atomic vapour - was inspired by Mr 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,' Mr Everett said.
'The atoms absorbed some of the trapped light, but a substantial proportion of the photons were frozen inside the atomic cloud.'
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 Associate Professor Buchler from RSPE and ARC Centre of Excellence for Quantum Computation and Communication Technology at ANU.
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 Dr Campbell from RSPE and ARC Centre of Excellence for Quantum Computation and Communication Technology at ANU.
'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,' Dr Campbell said.
http://phys.org/news/2016-09-quantum-closer-reality.html
A little light reading....
A little light interaction leaves quantum physicists beaming
