Key Findings
Researchers have successfully demonstrated that a quantum computer can monitor its internal state and respond in real-time while running. Using a 156-qubit IBM Quantum Heron processor, the team implemented a connected chain of up to 100 qubits to show that repeated resets can bring chaotic behavior under control. The study, published in Nature Physics, observed a sharp phase transition from chaos to order when the frequency of resets outpaced the process of information scrambling.
Technical Details
The experiment involved a competition between two opposing tasks performed nearly 5,000 times each:
- Scrambling: A process that mixed information among neighboring qubits, spreading chaos through the system similarly to shuffling a deck of cards.
- Control: A process where the computer checked individual qubits and reset them to a specific orderly state.
The team found that when scrambling occurred more than half the time, the system remained chaotic. However, when checking and resetting occurred more frequently, the system shifted abruptly into a controllable state. This demonstration involved nearly 5,000 two-qubit operations and nearly 5,000 measurements and resets while the processor continued to operate.
Background & Context
Quantum information is extremely sensitive to heat, electromagnetic signals, and hardware flaws, which cause errors to accumulate over time. Unlike classical data, quantum information cannot be copied, and measurement can destroy the state. To achieve fault tolerance—the ability to compute correctly despite individual qubit errors—a system must identify and correct errors repeatedly without losing the underlying information.
Significance & Outlook
This experiment represents one of the largest demonstrations of real-time quantum feedback control to date. According to Jedediah Pixley of Rutgers and Maika Takita of IBM, the ability to coordinate thousands of operations, measurements, and resets across a large system is a landmark step toward building larger, more reliable, and fault-tolerant quantum computers capable of simulating complex molecules and running advanced AI programs.
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