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Researchers find a way to make sure quantum computers return accurate answers (via Qpute.com)

Multiple quantum computers using different hardware are tested against each other by allowing them to perform random calculations linked by hidden graph structures. Credit: Ella Maru Studio

Quantum computers are advancing rapidly and are already pushing the boundaries of the world’s largest supercomputers. However, these devices are very sensitive to external influences and are prone to errors that can change the calculation results. This is especially difficult for quantum computations that go beyond the reach of reliable classical computers, and it is no longer possible to independently verify results through simulations. “To get the most out of future quantum computers for critical calculations, we need a way to make sure the output is correct, even if other methods cannot perform the calculation in question,” said Chiara Greganti of the University of Vienna. Stated.

Let the quantum computer check each other

To address this challenge, the team has developed and implemented a new cross-check procedure. This allows you to validate the results of calculations performed on one device through related but radically different calculations on another device. “We ask different quantum computers to perform different random-looking calculations,” explains Martin Ringbauer of the University of Insbrook. “What quantum computers don’t know is that there is a hidden connection between the calculations they are doing.” Using an alternative model of quantum computing built on the graph structure, the teams have in common. You can generate many different calculations from the source of. “The results look random and the calculations are different, but there are certain outputs that you need to agree on if the device is working properly.”

Simple and efficient technique

The team implemented the method on five current quantum computers using four different hardware technologies: superconducting circuits, trapped ions, photonics, and nuclear magnetic resonance. This shows that this method works on current hardware without any special requirements. The team has also demonstrated that this technique can be used to check a single device against itself. The two calculations are so different that the two results match only if they are also correct. Another important advantage of the new approach is that researchers do not have to see the complete results of their calculations. This can be very time consuming. “It’s enough to check the matching frequency when different devices are needed, which can be done on very large quantum computers,” said Tommaso Demarie of Entropica Labs, Singapore. As more and more quantum computers become available, this technology can be the key to ensuring that what is being advertised is done.

Academia and industry work together to make quantum computers reliable

Research aimed at making quantum computers reliable is a collaborative effort between university researchers and experts in the quantum computing industry at multiple companies. “This close collaboration between academia and industry makes this treatise unique from a sociological point of view,” said Joe Fitzsimons of Singapore’s Horizon Quantum Computing. “There is a progressive change, with some researchers moving to companies, but they continue to contribute to common efforts. Quantum computing Reliable and convenient. ”

The zero of the distribution function is a “shortcut” to thermodynamic calculations in a quantum computer.

For more information:
C. Greganti et al, Mutual verification of independent quantum devices, PRX Quantum (2021). DOI: 10.1103 / PhysRevX.11.031049

Quote: The researcher gave an accurate answer (September 2, 2021) by the quantum computer obtained from https: //phys.org/news/2021-09-quantum-accurate.html on September 2, 2021. I found a way to make sure it returns

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