4 problems

An EAQEC $[[n,k,d,c]]_q$ code is a quantum error-correcting code assisted by $c$ shared maximally entangled states; an MDS entanglement-assisted quantum code satisfies $2d+k=n+c+2$…

Essential attainability conjecture. For sufficiently large alphabet size $q$, all integer points below the line connecting MDS and EAQ correspond to possible code values.

Entanglement-assisted stabilizer codes use maximally entangled states, or ebits, to import classical binary or quaternary linear codes into the quantum setting. The entanglement-as…

Let $AG_1(m,2^t)$ be the affine-geometry Steiner system with parameters $S(2,2^t,2^{tm})$. The entanglement-assisted quantum LDPC codes in the source are constructed from incidence…