Researchers claim quantum computer breakthrough

Updated April 26, 2012 18:21:14



Audio: Quantum leap in computer technology (AM)


"Quantum computing is a kind of information science that is based on the notion that if one performs computations in a fundamentally different way than the way your classical desktop computer works, there's a huge potential to solve a variety of problems that are very, very hard or near impossible for standard computers," he explained.

"If you wanted to think how big a classical computer would need to be in order to solve this problem of roughly 300 interacting quantum particles, it turns out that that computer would need to be the size of the known universe - which is clearly something that's not possible to achieve."

What is quantum computing?

  • Normal computers use data encoded in binary digits (bits)
  • They work by manipulating bits that can exist in only one of two states - 0 or 1 - at any given time
  • Quantum computers instead use the properties of atoms and molecules to perform calculations
  • Quantum computers encode information as 'quantum bits', or 'qubits'
  • Qubits can exist in superposition - they can be both 0 and 1, and all points in between - at the same time.
  • Physicists believe this superposition will allow quantum computers to work on a million calculations at once, while a normal computer can only handle one
  • That gives quantum computers the potential to be millions of times more powerful than conventional machines


However, he says there is still plenty of work to do.

"The central element is something like a millimetre in diameter, 300 atoms that are suspended in space," he said.

"But of course everything depends on a huge amount of technical infrastructure around it.

"So there are vacuum chambers and pumps and lasers, and all of that takes up something like a room."

The quantum computer will move to a stage where it is so far out in front and performing such complex tasks it will be difficult to check if it is working accurately.

"They're not easily checked by a classical computer which opens a whole variety of problems," Dr Biercuk said.

Topics: science-and-technology, computers-and-technology, the-university-of-sydney-2006, south-africa, australia, united-states

First posted April 26, 2012 08:59:50