Dense coding swapping moves superdense coding advantage between channels using two-qubit unitaries, with exact conditions for three-qubit pure states.
Controlled Quantum Dense Coding in a Four-particle Non-maximally Entangled State via Local Measurements
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abstract
A controlled quantum dense coding scheme is investigated with a four-particle non-maximal quantum channel. The amount of classical information is shown to be capable of being controlled by the controllers through adjustments of the local measurement angles and to depend on the coefficients of the quantum channel; in addition, the four particles are distributed in two inverse ways in such an quantum channel. A restricted condition for distributing the particles to realize quantum dense coding in an arbitrary ($N+2$)-particle quantum channel is proposed.
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Characterizing pairwise swapping capabilities of dense coding channels
Dense coding swapping moves superdense coding advantage between channels using two-qubit unitaries, with exact conditions for three-qubit pure states.