TY - JOUR
T1 - Entanglement, discord, and the power of quantum computation
AU - Brodutch, Aharon
AU - Terno, Daniel R.
N1 - Brodutch A and Terno DR. Physical review A. Atomic, molecular, and optical physics, 83(1),010301(R), 2011. Copyright (2011) by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevA.83.010301.
PY - 2011/1/7
Y1 - 2011/1/7
N2 - We show that the ability to create entanglement is necessary for execution of bipartite quantum gates even when they are applied to unentangled states and create no entanglement. Starting with a simple example we demonstrate that to execute such a gate bilocally the local operations and classical communications (LOCC) should be supplemented by shared entanglement. Our results point to the changes in quantum discord, which is a measure of quantumness of correlations even in the absence of entanglement, as the indicator of failure of a LOCC implementation of the gates.
AB - We show that the ability to create entanglement is necessary for execution of bipartite quantum gates even when they are applied to unentangled states and create no entanglement. Starting with a simple example we demonstrate that to execute such a gate bilocally the local operations and classical communications (LOCC) should be supplemented by shared entanglement. Our results point to the changes in quantum discord, which is a measure of quantumness of correlations even in the absence of entanglement, as the indicator of failure of a LOCC implementation of the gates.
UR - http://www.scopus.com/inward/record.url?scp=78651236255&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.83.010301
DO - 10.1103/PhysRevA.83.010301
M3 - Article
AN - SCOPUS:78651236255
VL - 83
SP - 1
EP - 4
JO - Physical Review A: covering atomic, molecular, and optical physics and quantum information
JF - Physical Review A: covering atomic, molecular, and optical physics and quantum information
SN - 2469-9926
IS - 1
M1 - 010301
ER -