Evolution equation for entanglement of assistance

Details Evolution equation for entanglement of assistance Evolution equation for entanglement of assistance

2010-05-19

arxiv.org/abs/1005.3355v1

Phys. Rev. A 81 (2010) 042312

Physics

Quantum Physics

6 pages

Scientific paper

10.1103/PhysRevA.81.042312

We investigate the time evolution of the entanglement of assistance when one subsystem undergoes the action of local noisy channels. A general factorization law is presented for the evolution equation of entanglement of assistance. Our results demonstrate that the dynamics of the entanglement of assistance is determined by the action of a noisy channel on the pure maximally entangled state, in which the entanglement reduction turns out to be universal for all quantum states entering the channel. This single quantity will make it easy to characterize the entanglement dynamics of entanglement of assistance under unknown channels in the experimental process of producing entangled states by assisted entanglement.

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