Quantum computing reaches a major milestone: accuracy over 99%

2022-05-10 0 By

The three studies, published in The journal Nature, all show an accuracy of more than 99 per cent, an important milestone in quantum computing research machines.A digit, also called a bit, is the basic unit of information in a computer.Now the digits in a computer can only be in 0 and 1 states;In addition to 0 and 1, the quantum digits of a quantum computer also have a third state that is both 0 and 1, which is the so-called quantum superposition state.This gives quantum computers far more computing power than today’s computers.However, the quantum superposition state is easily disturbed by external factors, so the error rate of quantum digits is very high.This is a major stumbling block in the development of quantum computers.The three studies provide a breakthrough.Moreover, the designs in all three studies use silicon, which means the devices are more compatible with prevailing semiconductor manufacturing techniques.The first study, led by physicist Andrea Morello of the University of New South Wales (UNSW) in Australia, used the spin properties of phosphorus nuclei to encode quantum information.The other two studies, by Delft University of Technology in the Netherlands and RIKEN in Japan, used a different technique, using spintrons as quantum digits trapped in quantum dots made of silicon and silicon-germanium alloys.The singular and binary systems designed by both groups also achieved over 99% accuracy, as shown in the table below.Morello says the length of time their silicon-based quantum digits can hold information,It reached 35 seconds in 2014, when other technologies were able to hold information for only a hundred microseconds.But to achieve this advantage, their quantum digits need to be isolated from their surroundings, resulting in poor communication between the digits.To perform large-scale operations, quantum digits must communicate with each other smoothly.Now they have solved the problem.They used a quantum digital system consisting of an electron and two phosphorus nuclei.Two phosphorus nuclei communicate through this electron, and the researchers only manipulate two phosphorus nuclei, so the system only has two quantum digits involved, but it’s a three quantum digit system.”This is the first time that spin quantum digital technology has become competitive with superconducting circuits and ion traps in terms of global quantum control performance,” said Seigo Tarucha, who led the Dutch team.