2015/10/31 by Stefano Pirandola, Riccardo Laurenza, Carlo Ottaviani +1 · 9 citations
Physics and Astronomy · #cond-mat.other #physics.optics #quant-ph
paper · pdf · doi:10.1038/ncomms15043
published as Nature Communications 8, 15043 (2017) · Teleportation stretching applied to adaptive protocols in arbitrary dimension. Establishes a series of two-way assisted capacities for DV- and CV-systems
arxiv created 2016/01/05 · arxiv updated 2018/05/16
Using a technique based on quantum teleportation, we simplify the most general adaptive protocols for key distribution, entanglement distillation and quantum communication over a wide class of quantum channels in arbitrary dimension. Thanks to this method, we bound the ultimate rates for secret key generation and quantum communication through single-mode Gaussian channels and several discrete-variable channels. In particular, we derive exact formulas for the two-way assisted capacities of the bosonic quantum-limited amplifier and the dephasing channel in arbitrary dimension, as well as the secret key capacity of the qubit erasure channel. Our results establish the limits of quantum communication with arbitrary systems and set the most general and precise benchmarks for testing quantum repeaters in both discrete- and continuous-variable settings.