84 citations · 379 across the 37 of their papers we have counts for
3 papers · 2 filters
Recursive encoding and decoding of the noiseless subsystem for qudits
Utkan Güngördü, Chi-Kwong Li, Mikio Nakahara +2
We give a full explanation of the noiseless subsystem that protects a single-qubit against collective errors and the corresponding recursive scheme described by C.-K. Li et. al. [P…
Conditions for degradability of tripartite quantum states
Chi-Hang Fred Fung, Chi-Kwong Li, Nung-Sing Sze +1
Alice, Bob, and Eve share a pure quantum state. We introduce the notion of state degradability by asking whether the joint density of Alice and Eve can be transformed to the joint…
Maximal noiseless code rates for collective rotation channels on qudits
Chi-Kwong Li, Mikio Nakahara, Yiu-Tung Poon +1
We study noiseless subsystems on collective rotation channels of qudits, i.e., quantum channels with operators in the set ${\mathcal E}(d,n) = \{ U^{\otimes n}: U \in {\mathrm{SU}}…