TY - JOUR
T1 - Classical capacity of quantum thermal noise channels to within 1.45 bits
AU - König, Robert
AU - Smith, Graeme
PY - 2013/1/23
Y1 - 2013/1/23
N2 - We find a tight upper bound for the classical capacity of quantum thermal noise channels that is within 1/ln2 bits of Holevo's lower bound. This lower bound is achievable using unentangled, classical signal states, namely, displaced coherent states. Thus, we find that while quantum tricks might offer benefits, when it comes to classical communication, they can only help a bit.
AB - We find a tight upper bound for the classical capacity of quantum thermal noise channels that is within 1/ln2 bits of Holevo's lower bound. This lower bound is achievable using unentangled, classical signal states, namely, displaced coherent states. Thus, we find that while quantum tricks might offer benefits, when it comes to classical communication, they can only help a bit.
UR - http://www.scopus.com/inward/record.url?scp=84873022729&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.110.040501
DO - 10.1103/PhysRevLett.110.040501
M3 - Article
AN - SCOPUS:84873022729
SN - 0031-9007
VL - 110
JO - Physical Review Letters
JF - Physical Review Letters
IS - 4
M1 - 040501
ER -