Scientists from Duke University in the United States developed a protocol that allowed tracking the errors of a quantum computer at every stage of work.
Scientists from Duke University in the United States have developed an error correction method and, based on it, have assembled a quantum system that is resistant to noise and errors. As a result, the protocol was able to track errors at each stage of the scheme’s operation, there were less than 1% of them.
During the experiment, the authors of the new work combined several qubits so that they began to work as one. To do this, they used an error correction code to get rid of noise that interferes with computations. In a logical qubit, one qubit contains the necessary information, and the rest allow you to correct errors that affect the accuracy of calculations.
The result is a system that automatically tracks errors – they can be corrected at all stages of work. The fewer errors in the computation process, the more stable the operation of the device, the authors note.
Researchers were able to return the logical qubit to its original state and measure it 99.4% of the time. They note that individually, the units will work 98.9% of the time. This means that the authors have managed to seriously reduce the probability of quantum errors.
The authors have successfully developed a fault-tolerant logical qubit: the same approach can be used in a real physical system.