Stronger correlations than dense coding with the same quantum resources
Research Square (Research Square)(2021)
摘要
Dense coding is the seminal example of how entanglement
can boost quantum communication. By sharing an
Einstein-Podolsky-Rosen (EPR) pair, dense coding allows
one to transmit two bits of classical information while
sending only a single qubit [1]. This doubling of the
channel capacity is the largest allowed in quantum theory
[2]. In this letter we show in both theory and experiment
that same elementary resources, namely a shared EPR
pair and qubit communication, are strictly more powerful
than two classical bits in more general communication
tasks. In contrast to dense coding experiments [3–8],
we show that these advantages can be revealed using
merely standard optical Bell state analysers [9, 10].
Our results reveal that the power of entanglement in
enhancing quantum communications qualitatively goes
beyond boosting channel capacities.
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关键词
dense coding,stronger correlations,quantum
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