Bob Yirka is a research scientist at Phys.org.
A team of researchers affiliated with several institutions in France have developed a way to protect qubits inside a quantum computer from external noise. The group describes how they tackled the problem of qubit sensitivity to noise and how well their approach worked when tested.
External noise affects qubits, an obstacle to the development of quantum computers Delocalizing the quantum information used in the computer is one of the best ways to deal with noise. The noise is usually local. Researchers came up with a new way to delocalize where the information is stored.
Cooper pairs are used to describe the quantum computer's states. The pairs go through a junction. The researchers came up with a new type of qubit in which the quantum states are not local. Two Cooper pairs were able to tunnel through at the same time. Superinductors were used to make the junction. The team was able to control the interference element. The suppression of the Cooper pairs' tunnels allowed those that were co-tunneling to pass through unscathed. The magnification of the phase was doubled.
The system reduced the sensitivity of the qubits. Adding a quantum phase-slip will be tested by the researchers. This would allow for noise reduction in both spaces.
More information: W. C. Smith et al, Magnifying Quantum Phase Fluctuations with Cooper-Pair Pairing, Physical Review X (2022). DOI: 10.1103/PhysRevX.12.021002 Journal information: Physical Review XThere is a science network.
All Rights Reserved © 2024
