• Chinese researchers’ 78-qubit processor slows quantum chaos to delay information loss The research will help protect quantum information in qubits while also designing better quantum correction schemes. • Scientists at the Institute of Physics at the Chinese Academy of Sciences have directly observed and controlled prethermalisation - a temporary yet critical transition state in quantum systems. • The research conducted using Chaung tzu 2.0, a 78-qubit superconducting processor, paves the way for scientists to tune quantum decoherence, thereby allowing better control of quantum environments. • Just like a stationary pendulum, when nudged, returns to its stationary state, a quantum system, too, when disturbed, returns to its balanced state. • Any information or energy stored in the system begins to spread evenly and eventually is distributed. • While this sounds normal, in quantum computing, it is a major challenge.
Article Summaries:
- Chinese scientists at the Institute of Physics, Chinese Academy of Sciences, used the 78‑qubit Chaung tzu 2.0 superconducting processor to observe and control a transient “prethermalisation” stage in quantum systems. This intermediate plateau slows the onset of quantum chaos, temporarily preserving stored information before decoherence spreads it throughout the system. By applying tailored control sequences, the team demonstrated that the duration of this prethermalisation window can be lengthened or shortened, offering a new lever to extend qubit coherence times. The findings provide a practical framework for designing more effective quantum error‑correction schemes and improving the stability of quantum information in large‑scale processors.
Sources: