Overview
Quantum computers promise to solve certain problems far faster than conventional quantum computers. However, their extreme sensitivity to environmental disturbances makes them fragile. On 4 May 2026, researchers from Google Quantum AI reported a new source of instability called correlated phase error bursts.
Key Developments
- Publication in Physical Review X on 4 May 2026 documenting the phenomenon.
- Identification that high‑energy ionising radiation creates a splash of vibrations in the silicon substrate of a quantum chip.
- These vibrations break Cooper pairs in superconductors, generating a cloud of quasiparticles that flood the chip.
- Even with a protective “fence”, the mere presence of quasiparticles near a qubit shifts its operating frequency by up to 3 MHz for about 1 ms.
Important Facts
The frequency shift, though brief, is catastrophic for quantum algorithms because it occurs across many qubits simultaneously, effectively causing a sudden loss of coordination. Existing quantum error correction schemes assume that errors in different qubits are independent; the correlated burst invalidates this assumption and may set an upper bound on the reliability of present‑day quantum processors.
According to physicist Gianluigi Catelani of the Jülich Research Centre, two mitigation routes are already under development: (i) “traps” that absorb quasiparticle