Quantum Communication with Zero-Capacity Channels

By Graeme Smith, Jon Yard. Science, 2008

328 citations recorded by the source corpus.

Communication over a noisy quantum channel introduces errors in the transmission that must be corrected. A fundamental bound on quantum error correction is the quantum capacity, which quantifies the amount of quantum data that can be protected. We show theoretically that two quantum channels, each with a transmission capacity of zero, can have a nonzero capacity when used together. This unveils a rich structure in the theory of quantum communications, implying that the quantum capacity does not completely specify a channel's ability to transmit quantum information.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/bf349adb1f29bb3d8ed22ae7e0b871f96890cdcc

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Wireless Myths, Realities, and Futures: From 3G/4G to Optical and Quantum Wireless (2012, background): “associated with the encoding and decoding processes introduced by the 1st Postulate. The science-ﬁction saga continues... One of the hot research topics in this ﬁeld is referred to as superactivation [160]. Naturally, in contrast to the previous striking example, there are also numerous quantum chan”
The Theory of Quantum Information (2018, background): “68, along with the realization that it gives an example of the super-activation phenomenon, is due to Smith and Yard [194].”
A Survey on Quantum Channel Capacities (2018, background): “For example if we have a zero-capacity Horodecki channel and a zero-capacity symmetric channel, then their combination can result in positive joint capacity [497].”
Quantum channels and memory effects (2012, result): “A remarkable example of superadditivity for the quantum capacity, called superactivation, has been provided by Smith and Yard, 2008 by building up from previous results on the quantum assisted capacities (Smith, Smolin and Winter, 2008).”
Superadditivity of communication capacity using entangled inputs (2009, background): “In the first case, a dramatic violation of operational additivity was recently shown, in that there exist two channels, each of which has zero capacity to send quantum information no matter how many times it is used, but which can be used in tandem to send quantum information[5].”