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In a recent issue of Physical examination A, Argonne researchers present a new method to mitigate the effects of "noise" on quantum information systems, a challenge scientists around the world are tackling in the race for a new era of quantum technologies . The new method has implications for the future of quantum information science, including quantum computing and quantum detection.
Many current quantum information applications, such as performing an algorithm on a quantum computer, suffer from "decoherence" – a loss of information due to "noise" inherent in quantum hardware. Matthew Otten, Maria Goeppert Mayer Fellow at Argonne, and Stephen Gray, Head of Theory and Modeling at the Center for Nanoscale Materials, a user facility of the US Department of Energy's Office of Science. United, have developed a new technique to recover lost information. repeat the process or the experiment several times, with slightly different noise characteristics, then badyze the results.
After collecting the results by running the process several times in sequence or in parallel, the researchers construct a hypersurface where one axis represents the result of one measurement and the other two (or more) axes represent different noise parameters. This hypersurface provides an estimate of the observable noise-free and gives information about the effect of each noise level.
"It's like taking a series of defective photographs," Otten said. "Every photo has a flaw, but at a different place in the photo, when we compile all the crisp parts of the flawed photos, we get a clear photo."
The application of this technique effectively reduces quantum noise without the need for additional quantum hardware.
"This is a versatile technique that can be used with separate quantum systems undergoing the same process at the same time," said Otten.
"We could create several small quantum devices and run them in parallel," Gray said. "Using our method, we would combine the results on the hypersurface and generate approximate observables without noise.The results would help extend the usefulness of quantum devices before decoherence settles."
"We have successfully performed a simple demonstration of our method on the Rigetti 8Q-Agave quantum computer," said Otten. "This clbad of methods will probably be widely used in short-term quantum devices."
The work of the researchers described above is included in Physical examination A and entitled "Recovery of quantum observables without noise".
Otten and Gray have also developed a similar and somewhat less complex computer-based process to obtain noise reduction results based on one qubit correction at a time to approach the result for all qubits at the same time. correct simultaneously. A quantum bit, or quantum bit, is the equivalent, in quantum computing, of the digit or bit used in clbadical computing.
"In this approach, we badume that the noise can be reduced on each qubit individually, which, while experimenting, poses a much simpler data processing problem and results in an estimate of the result without noise," Otten noted.
Source of the story:
Material provided by DOE / Argonne National Laboratory. Note: Content can be changed for style and length.
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