TY - JOUR
T1 - Entanglement-breaking channels and entanglement sudden death
AU - Knoll, Laura T.
AU - Schmiegelow, Christian T.
AU - Farías, Osvaldo Jiménez
AU - Walborn, Stephen P.
AU - Larotonda, Miguel A.
N1 - Funding Information:
We acknowledge financial support from the Brazilian funding agencies CNPq, CAPES, and FAPERJ and the Argentine funding agencies CONICET and ANPCyT. This work was performed as part of the Brazilian National Institute of Science and Technology for Quantum Information. O.J.F. was supported by the Beatriu de Pins fellowship (Grant No. 2014 BP-B 0219) and Spanish MINECO (Severo Ochoa Grant No. SEV-2015-0522). We thank Dr. C. O'Meara for useful discussions. C.T.S. acknowledges the support of the Alexander von Humboldt Foundation.
Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/7/29
Y1 - 2016/7/29
N2 - The occurrence of entanglement sudden death in the evolution of a bipartite system depends on both the initial state and the channel responsible for the evolution. An extreme case is that of entanglement-breaking channels, which are channels that, acting on only one of the subsystems, drives them to full disentanglement, regardless of the initial state. In general, one can find certain combinations of initial states and channels acting on one or both subsystems that can result in entanglement sudden death or not. Neither the channel nor the initial state are responsible for this effect but their combination. In this paper we show that, for two entangled qubits, when entanglement sudden death occurs, the evolution can be mapped to that of an effective entanglement-breaking channel on a modified initial state. Our results allow to anticipate which states will suffer entanglement sudden death or not for a given evolution. An experiment with polarization-entangled photons demonstrates the utility of this result in a variety of cases.
AB - The occurrence of entanglement sudden death in the evolution of a bipartite system depends on both the initial state and the channel responsible for the evolution. An extreme case is that of entanglement-breaking channels, which are channels that, acting on only one of the subsystems, drives them to full disentanglement, regardless of the initial state. In general, one can find certain combinations of initial states and channels acting on one or both subsystems that can result in entanglement sudden death or not. Neither the channel nor the initial state are responsible for this effect but their combination. In this paper we show that, for two entangled qubits, when entanglement sudden death occurs, the evolution can be mapped to that of an effective entanglement-breaking channel on a modified initial state. Our results allow to anticipate which states will suffer entanglement sudden death or not for a given evolution. An experiment with polarization-entangled photons demonstrates the utility of this result in a variety of cases.
UR - http://www.scopus.com/inward/record.url?scp=84979917463&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.94.012345
DO - 10.1103/PhysRevA.94.012345
M3 - Article
AN - SCOPUS:84979917463
SN - 2469-9926
VL - 94
JO - Physical Review A
JF - Physical Review A
IS - 1
M1 - 012345
ER -