ENGINEERING LONG RANGE DISTANCE INDEPENDENT ENTANGLEMENT VIA LOCAL MANIPULATION OF A KONDO SPIN CHAIN
Abolfazl Bayat, Pasquale Sodano, Sougato Bose
We exploit the unique features of the entanglement in the gapless Kondo regime to show that a single local quench at one end of a Kondo spin chain may always induce fast and long lived oscillatory dynamics, which establishes a high quality entanglement between the individual spins at the opposite ends of the chain. This entanglement is a footprint of the presence of the Kondo cloud and may be engineered so as to attain — even for very large chains- a constant high value independent of the length; in addition, it is thermally robust. To better evidence the remarkable peculiarities of the Kondo regime, we carry a parallel analysis of the entanglement properties of the Kondo spin chain model in the gapped dimerised regime where these remarkable features are absent.
International Journal of Quantum Information•Jan 1, 2011•0 citations