Related papers: Magic Resource Can Enhance the Quantum Capacity of Channels

Magic Resource Can Enhance the Quantum Capacity of Channels

URL: http://arxiv.org/abs/2401.12105v3
Date: Fri, 07 Feb 2025 03:13:40 GMT
Title: Magic Resource Can Enhance the Quantum Capacity of Channels
Authors: Kaifeng Bu, Arthur Jaffe,
Abstract summary: We consider the quantum channel of the recently proposed discrete beam splitter with the fixed environmental state. We find that if the fixed environmental state is a stabilizer state, then the quantum capacity is zero. We find that the quantum capacity is nonzero for some magic states, and the quantum capacity increases linearly with respect to the number of single-qudit magic states in the environment.
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Abstract: We investigate the role of magic resource in the quantum capacity of channels. We consider the quantum channel of the recently proposed discrete beam splitter with the fixed environmental state. We find that if the fixed environmental state is a stabilizer state, then the quantum capacity is zero. Moreover, we find that the quantum capacity is nonzero for some magic states, and the quantum capacity increases linearly with respect to the number of single-qudit magic states in the environment. We also bound the maximal quantum capacity of the discrete beam splitter in terms of the amount of magic resource in the environmental states. These results suggest that magic resource can increase the quantum capacity of channels; it sheds new insight into the role of stabilizer and magic states in quantum communication.

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