Increasing communication capacity via superposition of order
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Author(s)
Goswami, K
Cao, Y
Paz-Silva, GA
Romero, J
White, AG
Griffith University Author(s)
Year published
2020
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Classically, no information can be transmitted through a depolarising, which is a completely noisy, channel. We show that by combining a depolarising channel with another channel in an indefinite causal order—that is, when there is a superposition of the order that these two channels were applied—it becomes possible to transmit significant information. We consider two limiting cases. When both channels are fully depolarising, the ideal limit is communication of 0.049 bits; experimentally we achieve (3.4 ± 0.2) × 10−2 bits. When one channel is fully depolarising, and the other is a known unitary, the ideal limit is communication ...
View more >Classically, no information can be transmitted through a depolarising, which is a completely noisy, channel. We show that by combining a depolarising channel with another channel in an indefinite causal order—that is, when there is a superposition of the order that these two channels were applied—it becomes possible to transmit significant information. We consider two limiting cases. When both channels are fully depolarising, the ideal limit is communication of 0.049 bits; experimentally we achieve (3.4 ± 0.2) × 10−2 bits. When one channel is fully depolarising, and the other is a known unitary, the ideal limit is communication of 1 bit. We experimentally achieve 0.64 ± 0.02 bits. Our results offer intriguing possibilities for future communication strategies beyond conventional quantum Shannon theory.
View less >
View more >Classically, no information can be transmitted through a depolarising, which is a completely noisy, channel. We show that by combining a depolarising channel with another channel in an indefinite causal order—that is, when there is a superposition of the order that these two channels were applied—it becomes possible to transmit significant information. We consider two limiting cases. When both channels are fully depolarising, the ideal limit is communication of 0.049 bits; experimentally we achieve (3.4 ± 0.2) × 10−2 bits. When one channel is fully depolarising, and the other is a known unitary, the ideal limit is communication of 1 bit. We experimentally achieve 0.64 ± 0.02 bits. Our results offer intriguing possibilities for future communication strategies beyond conventional quantum Shannon theory.
View less >
Journal Title
Physical Review Research
Volume
2
Issue
3
Copyright Statement
© 2020 The Authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Subject
Nanotechnology