Scientists take a giant leap forward in developing quantum machines
Washington, September 26 : A team of University of Calgary (U of C) researchers has
come up with a unique new way of testing quantum devices to determine their function and
accuracy, which could pave the way for a new generation of supercomputers, unbreakable
codes, and ultra-fast and secure communication networks.
"Building quantum machines is difficult because they are very complex, therefore the
testing you need to do is also very complex," said Barry Sanders, director of the U of C's
Institute for Quantum Information Science.
"We broke a bunch of taboos with this work because we have come up with an entirely new
way of testing that is relatively simple and doesn't require a lot of large and expensive
diagnostic equipment," he added.
Similar to any electronic or mechanical device, building a quantum machine requires a
thorough understanding of how each part operates and interacts with other parts if the
finished product is going to work properly.
In the quantum realm, scientists have been struggling to find ways to accurately
determine the properties of individual components as they work towards creating useful
quantum systems.
The U of C team has come up with a highly-accurate method for analyzing quantum optical
processes using standard optical techniques involving lasers and lenses.
"It is a completely different approach to quantum characterization than we have seen
before," said post-doctoral researcher Mirko Lobino, the research paper's lead author.
"This process will be able to tell us if something is working correctly and will
hopefully lead the way towards a quantum certification process as we move from quantum
science to making quantum technology," he added.
The development of quantum computers is considered the next major advancement in
computer processing and memory power but is still in its infancy.
Unlike regular silicon-based computers that transmit information in binary units (bits)
using 1 and 0, quantum computers use the subatomic physical processes of quantum mechanics
to transmit information in quantum bits (qubits) that can exist in more than two
states.
Computers based on quantum physics are predicted to be far more powerful than computers
based on classical physics and could break many of the most advanced codes currently used
to secure digital information.
Quantum physics is also being used to try and create new, unbreakable encryption
systems.
The same research group at the U of C, led by physics professor Alexander Lvovsky, made
headlines earlier this year when they were one of two teams to independently prove it's
possible to store a special kind of light, called a "squeezed vacuum."
That work is considered the initial step towards creating memory systems for quantum
computing.
--ANI
