Scientists have clarified the process behind persistent error bursts in superconducting quantum computers, even those strengthened with gap engineering. These sophisticated devices remain vulnerable to ionizing radiation from cosmic rays and surrounding sources. When radiation strikes the silicon substrate, it produces quasiparticles that bring devastation to the fragile qubits.
Although gap engineering establishes an energy barrier within the superconducting material, it has proven insufficient. Researchers at Google Quantum AI determined that quasiparticles alter the qubits' resonant frequency by up to 3 MHz, throwing them out of sync with the microwave control pulses. This induces correlated phase errors, wherein multiple qubits accumulate incorrect quantum state shifts simultaneously. This revelation provides a compelling explanation for the logical error rate floor observed in prior error-correction experiments.
Sources: phys.org
The words in bold are from the article.
| 1. clarified | a. mechanism |
| 2. process | b. fortified |
| 3. strengthened | c. generates |
| 4. vulnerable | d. elucidated |
| 5. surrounding | e. susceptible |
| 6. produces | f. erects |
| 7. devastation | g. ascertained |
| 8. establishes | h. destruction |
| 9. determined | i. ambient |
| 10. simultaneously | j. concurrently |
1.d 2.a 3.b 4.e 5.i 6.c 7.h 8.f 9.g 10.j