May 23, 2025, Science Highlights

Using the Petz map for quantum error correction

Optimality condition for the Petz map

Physical Review Letters (2025)

In quantum error correction, the Petz map is a method that can perfectly fix errors when certain ideal conditions are met. Even though perfect recovery isn’t usually possible, the Petz map still does a very good job in most cases.

In this paper, scientists identify exactly when the Petz map is the best possible choice by linking it to a specific measure of how well quantum information is preserved. In some cases, it’s easy to tell when the Petz map won’t be optimal by checking a simple mathematical rule.

The paper authors are Bikun Li, Zhaoyou Wang, Guo Zheng, Yat Wong and Liang Jiang, who conducted their work at the University of Chicago.

September 9, 2026, News and Features
David Awschalom wins global Breakthrough of the Year award

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September 1, 2026, Science Highlights
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August 21, 2026, Science Highlights
Making quantum bits ready to use again much sooner

Scientists from the University of Wisconsin-Madison and Intel have found that a simple electrical pulse can quickly push a quantum dot qubit out of a latched state and return it to its starting condition with very high reliability. Read More
August 18, 2026, News and Features
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August 11, 2026, News and Features
Researchers generate spontaneous magnons that synchronize with external signals

Researchers at Argonne and the University of Illinois Urbana-Champaign demonstrate a method for generating stable ripples in magnetic materials called magnons. The work opens avenues for information processing in microelectronics and quantum devices. Read More
August 4, 2026, In the News
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From the U.S. Department of Energy: Q-NEXT researchers map the variation in materials to the atom level to scale up silicon qubits Read More
July 28, 2026, Science Highlights
Color centers in high-purity diamond

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July 13, 2026, News and Features
Containing multitudes: SLAC scientist collaborates to create scalable qubits

At SLAC National Accelerator Laboratory, Q-NEXT collaborator Shannon Harvey develops quantum dots — a mass-producible type of qubit. Driven by curiosity about nature and how things work, Harvey draws on her facility for working at the nanoscale. Read More