Noise is resource-contextual in quantum communication

• URL: http://arxiv.org/abs/2305.00680v3
• Date: Tue, 5 Sep 2023 01:25:50 GMT
• Title: Noise is resource-contextual in quantum communication
• Authors: Aditya Nema, Ananda G. Maity, Sergii Strelchuk and David Elkouss
• Abstract summary: Estimating the information transmission capability of a quantum channel remains one of the fundamental problems in quantum information processing. One of the most significant manifestations of this is the superadditivity of the channel capacity. Our constructions demonstrate that noise is context dependent in quantum communication.
• Score: 1.8749305679160366
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Estimating the information transmission capability of a quantum channel remains one of the fundamental problems in quantum information processing. In contrast to classical channels, the information-carrying capability of quantum channels is contextual. One of the most significant manifestations of this is the superadditivity of the channel capacity: the capacity of two quantum channels used together can be larger than the sum of the individual capacities. Here, we present a one-parameter family of channels for which as the parameter increases its one-way quantum and private capacities increase while its two-way capacities decrease. We also exhibit a one-parameter family of states with analogous behavior with respect to the one- and two-way distillable entanglement and secret key. Our constructions demonstrate that noise is context dependent in quantum communication.

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