Entangled logical qubits on a superconducting quantum processor
How to prepare an accurate paper press kit? Illustrated guide
Robin Harper, Xanda C. Kolesnikow, Campbell K. McLauchlan, Georgia M. Nixon, Stephen D. Bartlett, Benjamin J. Brown · arXiv: 2610.32347v1 · Summary page
Why cover this story this week?
Protected qubits learn to work together
Protecting one logical qubit is only part of building a useful quantum computer: protected qubits must also interact. On IBM’s Phoenix superconducting processor, researchers report logical Bell-state fidelities above 93 percent, measuring how closely two encoded qubits matched their intended entangled state. They created that entanglement using lattice surgery, a technique that changes how neighboring error-correcting code patches are measured to perform joint operations.
With three logical qubits, the team also demonstrated teleportation of states and gates, reporting fidelities between 78 and 93 percent. Selecting working components, tailoring decoding to measured noise and resetting qubits to reduce leakage all contributed to performance. The preprint brings error protection and logical operations together on one device, while the remaining errors show how much improvement is still needed.
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