Demonstrating the utility of quantum computing in the pre-fault-tolerant era

A technical paper titled „Evidence for Applications of Quantum Computing” was published by researchers from IBM Quantum, University of California Berkeley, RIKEN and Lawrence Berkeley National Laboratory.

Summary:

„Quantum computing promises to provide significant speedup over its classical counterpart for some problems. However, the biggest obstacle to realizing its full potential is the noise inherent in these systems. A widely accepted solution to this challenge is to implement fault-tolerant quantum circuits that are beyond the reach of current processors. Noiseless 127- Here we report experiments on the qubit processor and measure precision expectation values ​​for circuit modules at a scale beyond brute-force classical computation. We argue that this represents evidence for the application of quantum computing in the pre-rotation-tolerance era. Synchronization and calibration of a superconducting processor of this scale and such a large device. These test results are enabled by the ability to classify and control noise throughout.We establish the accuracy of the measured expected values ​​by comparing them with the output of a properly verifiable circuit. In the regime of strong entanglement, the quantum computer provides exact results for which leading classical approximations such as pure-state-based 1D (matrix product states, MPS) and 2D (isometric tensor network states, isoTNS) tensor network methods break down. These experiments demonstrate a fundamental tool for approaching quantum applications.

to find out Technical sheet here. Published: June 2023.

Kim, Y., Eddins, A., Anand, S. and many others. Proof of use of quantum computing before fault tolerance. Nature 618, 500–505 (2023). https://doi.org/10.1038/s41586-023-06096-3

Related reading
Quantum Computing Knowledge Center

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