期刊
PHYSICAL REVIEW RESEARCH
卷 2, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.2.033292
关键词
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资金
- Australian Research Council (ARC) by Centre of Excellence for Engineered Quantum Systems (EQUS) [CE170100009]
- DECRA grant [DE160100409, DE170100088]
- Advance Queensland Funding
- L'Oreal-UNESCO FWIS grant
- CSC scholarship
- University of Queensland by a Vice-Chancellor's Senior Research and Teaching Fellowship
- John Templeton Foundation
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) x 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.
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