hypergraph product codes 1neutral-atom quantum computing 1phantom codes 1qldpc codes 1quantum error correction 1
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quant-ph2026
A Sharp Local-Question Threshold for GHZ-Equatorial Completeness in Four-Player XOR Games
Ziao Tang, Chengkai Zhu, Ge Bai +2
We determine the smallest number of active questions per player at which a four-player binary exclusive-or (XOR) game of commuting-operator value one need not admit a Greenberger--…
quant-ph2026
Logical Entangling with Phantom Codes in Hypergraph Products
Keming He, Ziao Tang, Zetong Li +2
The paper identifies the simplex‑repetition family of binary CSS hypergraph product codes as the unique HGP family that satisfies the phantom‑code condition, allowing logical CNOT…
quant-ph2026
Simulation of Adjoints and Petz Recovery Maps for Unknown Quantum Channels
Chengkai Zhu, Ziao Tang, Guocheng Zhen +3
Transformations of quantum channels, such as the transpose, complex conjugate, and adjoint, are fundamental to quantum information theory. Given access to an unknown channel, a cen…