TY - JOUR
T1 - Every entangled state provides an advantage in classical communication
AU - Bäuml, S.
AU - Winter, A.
AU - Yang, D.
N1 - Publisher Copyright:
© 2019 Author(s).
PY - 2019/7/1
Y1 - 2019/7/1
N2 - We investigate the use of noisy entanglement as a resource in classical communication via a quantum channel. In particular, we are interested in the question whether for any entangled state, including bound entangled states, there exists a quantum channel, the classical capacity of which can be increased by providing the state as an additional resource. We partially answer this question by showing, for any entangled state, the existence of a quantum memory channel, the feedback-assisted classical capacity with product encodings of which can be increased by using the state as a resource. Using a different (memoryless) channel construction, we also provide a sufficient entropic condition for an advantage in classical communication (without feedback and for general encodings) and thus provide an example of a state that is not distillable by means of one-way local operations and classical communication but can provide an advantage in the classical capacity of a number of quantum channels. As separable states cannot provide an advantage in classical communication, our condition also provides an entropic entanglement witness.
AB - We investigate the use of noisy entanglement as a resource in classical communication via a quantum channel. In particular, we are interested in the question whether for any entangled state, including bound entangled states, there exists a quantum channel, the classical capacity of which can be increased by providing the state as an additional resource. We partially answer this question by showing, for any entangled state, the existence of a quantum memory channel, the feedback-assisted classical capacity with product encodings of which can be increased by using the state as a resource. Using a different (memoryless) channel construction, we also provide a sufficient entropic condition for an advantage in classical communication (without feedback and for general encodings) and thus provide an example of a state that is not distillable by means of one-way local operations and classical communication but can provide an advantage in the classical capacity of a number of quantum channels. As separable states cannot provide an advantage in classical communication, our condition also provides an entropic entanglement witness.
UR - http://www.scopus.com/inward/record.url?scp=85069846630&partnerID=8YFLogxK
U2 - 10.1063/1.5091856
DO - 10.1063/1.5091856
M3 - Article
AN - SCOPUS:85069846630
SN - 0022-2488
VL - 60
JO - Journal of Mathematical Physics
JF - Journal of Mathematical Physics
IS - 7
M1 - 072201
ER -