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­niversity of Sydney Develops Quantum Trick to Block Background Sensor 'chatter'

By ZDnet

December 20, 2017

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Researchers at the University of Sydney (USyd) in Australia, Dartmouth College, and Johns Hopkins Applied Physics Laboratory have developed a method to block background "chatter," which they say solves a common problem associated with quantum sensing devices.

The new quantum control techniques could lead to the development of ultra-sensitive sensors that can identify tiny signals while rejecting background noise down to theoretical limits.

"By applying the right quantum controls to a qubit [quantum bit]-based sensor, we can adjust its response in a way that guarantees the best possible exclusion of the background clutter--that is, the other voices in the room," says USyd professor Michael J. Biercuk.

The team's experiments used trapped atomic ions to reduce spectral leakage by "many orders of magnitude" over conventional methods. In addition, the new approach is relevant to nearly any quantum sensing application and can be applied to quantum computing.

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