In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank:
Researchers in quantum computing face the twin difficulties of (1)_____ qubit coherence and (2)_____ error rates. While superconducting qubits have shown promise, maintaining coherence beyond microseconds remains (3)_____ due to environmental decoherence. Furthermore, scaling up the number of qubits requires (4)_____ control electronics that themselves introduce noise. To overcome these hurdles, teams are exploring (5)_____ techniques such as surface codes and topological qubits.
What should come in the place of 3?
Show answer & explanation
Correct answer: B
Explanation
The passage discusses the "difficulties" and "hurdles" in quantum computing. Specifically, it mentions that while there is promise, maintaining coherence for long periods remains difficult because of environmental interference.
Elusive means difficult to find, catch, or achieve, which perfectly fits the context of a goal that is currently hard for researchers to reach.
Tractable means easy to control or influence (the opposite of what is needed).Innate means inborn or natural.
Redundant means no longer needed or useful.