Chinese researchers have demonstrated a silicon quantum processor capable of performing a full set of error-detecting logical operations, marking a key step toward practical quantum computing.<\/p>\n
The team from Shenzhen International Quantum Academy built a device that can process quantum information while checking for errors, something previously shown in platforms like superconducting circuits but not in silicon.<\/p>\n
Quantum systems are highly sensitive to noise, which introduces errors that can disrupt calculations. One solution is to encode information into logical qubits that can detect and handle such errors.<\/p>\n
The researchers say their work shows that the essential building blocks for fault-tolerant quantum computing are now achievable in silicon, a material widely used in modern electronics.<\/p>\n
From qubits to logic<\/p>\n
The processor was created by placing phosphorus atoms into silicon <\/a>with atomic precision, allowing individual control of quantum bits. The team also developed methods to reduce signal interference, a major source of error in quantum systems.<\/p>\n Using four qubits, the researchers encoded two logical qubits capable of detecting errors during computation. This approach allowed the system to flag unwanted noise that could otherwise affect results.<\/p>\n The study demonstrated a complete chain of operations, including preparing error-checked states, performing logical operations, and applying them in an algorithm.<\/p>\n To test the system, the team ran a quantum algorithm to calculate the lowest-energy state of a water molecule. The result closely matched the theoretical value, showing the system can handle practical tasks.<\/p>\n Running real algorithms now<\/p>\n The researchers used the Variational Quantum Eigensolver to simulate the molecule, achieving results with small deviation from expected values. This indicates the approach could support real-world quantum applications in the future.<\/p>\n The work also showed that silicon-based systems can move beyond controlling small numbers of qubits to performing coordinated operations with built-in error detection.<\/p>\n