Arithmetic of qudit dimensions governs erasure correction on the Fano plane and stabilizer-state entanglement
Year: 2026
Type: preprint
Abstract: Qudit codes often inherit the parameters of qubit codes, but not necessarily their correctable erasures. We show that a code encoding one qudit of dimension D into seven such qudits that corrects every erasure Steane's code corrects exists exactly when D is a power of 2; for the qutrit color code, exactly when D is odd. This needs no stabilizer assumption: these codes are, up to local unitaries, stabilizer codes of qubits, respectively prime-power qudits. The two patterns differ in one line, which completes the Fano plane only where 1+1=0. As ideal secret sharing schemes, these codes exist exactly where classical ones do: entanglement does not help, unlike for Euler's 36 officers. The same arithmetic makes the entropy cones of qubit and odd-dimensional stabilizer states incomparable from six parties on. At five, the stabilizer cone is strictly smaller than the quantum linear rank cone, answering an open question.
Source: arXiv (Cornell University)
Authors: Song, Xidan, Cao, Ruifeng
Institutions: Wuhan University, University of Manchester
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222094440