To this end, the team had introduced additional, precisely controlled sources of interference into the experiment and determined the calculation errors for sources of interference of varying intensity and for both pulse forms. "For our experiment this made a huge difference," says Giorgio Zarantonello, one of the authors of the study. "In the past, for good arithmetic operations, we had to try and optimize for a long time until we caught a moment when the sources of interference were very small. Now we can simply switch on our experiment and it works!".
Now that the scientists have been able to show that elementary arithmetic operations can be realized with low error rates, they want to achieve the same for more complex tasks. Their goal is to achieve significantly less than one error every ten thousand operations. Only then does it make sense to extend the application to many qubits. To this end, the scientists have already developed a patented manufacturing process that makes it possible to store and manipulate many qubits in a chip structure.
The work was supported by the Quantum Technology Flagship Project of the EU, among others. Within the next decade, the EU intends to invest 1 billion euros to make findings from quantum physical basic research technologically usable. Researchers from Hanover and Braunschweig are working here within the "MicroQC" project together with colleagues from Siegen, Sussex, Jerusalem and Sofia.
Original publication: https://doi.org/10.1103/PhysRevLett.123.260503