US EditionChinese scientists create super stable building block for quantum computers
Using a 6×6 qubit grid on the Zuchongzhi 2 quantum processor, the team demonstrated topologically protected corner states that resist errors, advancing quantum computing reliability.
- On Friday, Pan Jianwei, a USTC physicist, used the Zuchongzhi 2 programmable superconducting quantum processor to simulate quantum effects locked into corners, reported in Science.
- Faced with qubits' fragility, the researchers turned to topology to gain built-in robustness, avoiding complex traditional error-correction methods that require many extra qubits.
- Using a 6×6 qubit grid on Zuchongzhi 2, the researchers designed precise interactions and applied controlled sequences to drive non-equilibrium higher-order topological phases, tracking time-evolving qubit behaviour to identify corner-mode signatures.
- The experiment marks the first experimental realisation of non-equilibrium higher-order topological phases and demonstrates that noisy intermediate-scale quantum processors can create exotic states, though it does not yet yield fully error-proof qubits.
- If scaled into hardware, protected corner modes could underpin reliable quantum memory and logic units, advancing Pan's efforts in the tech race with the United States; future research will explore interactions, phases, and custom materials.
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Fault-tolerant quantum computing (FTQC) is essential for achieving large-scale practical quantum computation. Implementing arbitrary FTQC requires the execution of a universal gate set on logical qubits, which is highly challenging. Particularly, in the superconducting system, two-qubit gates on surface code logical qubits have not been realized. Here, we experimentally implement a logical CNOT gate along with arbitrary single-qubit rotation gat…
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