03/07/2026
Bright Prep Credit Transfer Support between Brac University and University of Sydney Student: Expert advice on course equivalency, credit evaluation, articulation pathways and transfer application procedures to help students move smoothly between institutions
Researchers at the University of Sydney in collaboration with IBM have identified a major source of errors that limits the performance of today's quantum computers and demonstrated a practical way to reduce its impact. Their findings, published in Nature Communications, represent an important step toward making quantum computers more reliable and scalable.
Quantum computers have the potential to solve problems that are beyond the capabilities of classical computers, such as simulating complex molecules, designing new materials and drugs, and tackling difficult optimization tasks. However, the quantum bits (qubits) that perform these calculations are extremely fragile and easily disrupted by environmental noise.
To protect quantum information, quantum computers rely on quantum error correction, which continuously checks for errors during a computation. These checks require mid-circuit measurements, where special helper qubits are measured while the rest of the quantum system continues operating. Although essential, these measurements introduce an unexpected challenge: while the measurements are being performed, the remaining qubits must wait in an idle state, allowing additional noise to accumulate and increasing the likelihood of errors.
Using IBM's 156-qubit Quantum Heron r2 processor, the researchers investigated how these mid-circuit measurements affect quantum error correction. They found that the idle time associated with the measurements is one of the largest contributors to errors in current superconducting quantum computers.
Rather than changing the hardware, the team redesigned the error-correction circuits to reduce the amount of time qubits remain idle during measurements. This optimization increased the logical qubit survival rate from below 90% to more than 96% for each error-correction cycle, demonstrating a significant improvement in the reliability of quantum operations.
The study shows that measurement-related delays, rather than the measurements alone, are a major obstacle to fault-tolerant quantum computing. By identifying and quantifying this bottleneck, the researchers provide valuable guidance for future hardware and software improvements, including faster measurement systems, lower-latency control electronics, and more efficient error-correction protocols.
Overall, the work advances the understanding of how errors arise in quantum computers and demonstrates that thoughtful engineering of error-correction procedures can substantially improve performance. These findings bring the field one step closer to building large-scale, fault-tolerant quantum computers capable of solving real-world scientific and industrial problems.
Bright Prep IELTS Reading Practice
1. What was the primary objective of the University of Sydney and IBM research?
A. To develop a new type of quantum processor
B. To identify major sources of errors in quantum computers and improve error correction
C. To replace superconducting qubits with classical bits
D. To eliminate the need for quantum error correction
2. According to the passage, why are quantum computers difficult to scale up?
A. They require too much electrical power.
B. Their qubits are highly susceptible to noise and instability.
C. They cannot perform chemical simulations.
D. They are slower than classical computers.
3. What is the purpose of mid-circuit measurements?
A. To stop quantum computations permanently
B. To convert all qubits into classical bits
C. To detect errors during computation while preserving the remaining quantum information
D. To reduce the number of qubits required
Bright Prep SAT Reading and Writing Practice
Question 1: Central Idea
Which choice best states the central idea of the passage?
A. Quantum computers are now reliable enough for commercial use.
B. Researchers identified a major source of errors in quantum computers and demonstrated a way to improve error correction.
C. Classical computers are becoming obsolete because of advances in quantum computing.
D. IBM has developed a completely new type of quantum processor.
Question 2: Evidence
Which detail from the passage best supports the claim that the researchers' approach improved quantum computing performance?
A. The study was published in Nature Communications.
B. The processor contained 156 qubits.
C. The redesigned error-correction circuit increased logical qubit survival rates from below 90% to more than 96%.
D. The collaboration began in 2024.
Question 3: Inference
What can reasonably be inferred about mid-circuit measurements?
A. They are unnecessary for quantum error correction.
B. They improve reliability without introducing any drawbacks.
C. They are essential but can indirectly increase errors by causing other qubits to remain idle.
D. They permanently collapse every qubit in the quantum computer.
Question 4: Vocabulary in Context
As used in the passage, the word "susceptible" most nearly means:
A. resistant
B. vulnerable
C. adaptable
D. identical
Question 5: Function of a Paragraph
The paragraph describing the redesign of the error-correction circuitry primarily serves to
A. explain how the researchers addressed a major source of errors.
B. criticize previous quantum computing research.
C. compare superconducting qubits with trapped-ion qubits.
D. introduce a competing theory of quantum error correction.
Question 6: Data Interpretation
According to the passage, which statement is supported by the reported results?
A. Every logical qubit survived all error-correction cycles.
B. The redesigned approach completely eliminated measurement noise.
C. The redesigned error-correction method significantly increased logical qubit survival rates.
D. Quantum computers no longer require error correction.
Question 7: Author's Purpose
Why does the author mention the collaboration between the University of Sydney and IBM?
A. To demonstrate how partnerships between academia and industry can advance quantum technology.
B. To argue that universities should replace private companies in quantum research.
C. To explain why IBM owns the University of Sydney.
D. To compare Australian and American research funding.
Answer: A
Question 8: Logical Completion
Which choice best completes the text?
The researchers found that while mid-circuit measurements are necessary for quantum error correction, they also introduce delays. Consequently, the team focused on __________.
A. eliminating quantum measurements entirely
B. replacing superconducting qubits with classical bits
C. redesigning the error-correction circuitry to reduce idle time
D. increasing the number of physical qubits without changing the circuitry
Answer: C
Question 9: Command of Evidence
A student claims that measurement noise is one of the primary limitations of current quantum computers.
Which quotation from the passage provides the strongest evidence for this claim?
A. "Quantum computers promise to solve certain classes of problems beyond the reach of conventional computers."
B. "The researchers also found that measurement noise is one of the dominant limitations affecting the reliability of quantum logic operations on present-day devices."
C. "The paper has been published in Nature Communications."
D. "Professor Bartlett is the director of Sydney Nano."
Answer: B
Question 10: Rhetorical Synthesis
A student wants to emphasize the practical significance of the study.
Which detail from the passage is most relevant?
A. The study involved an international talent exchange program.
B. The researchers used a 156-qubit IBM Quantum Heron r2 processor.
C. Improved quantum error correction could help enable future applications such as drug discovery, materials design, and optimization.
D. The research was conducted at the University of Sydney.
Answer: C
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