Optically induced multispin entanglement in a semiconductor quantum well.
According to quantum mechanics, a many-particle system is allowed to exhibit non-local behaviour, in that measurements performed on one of the particles can affect a second one that is far away. These so-called entangled states are crucial for the implementation of most quantum information protocols and, in particular, gates for quantum computation. Here we use ultrafast optical pulses and coherent techniques to create and control spin-entangled states in an ensemble of non-interacting electrons bound to donors (at least three) and at least two Mn2+ ions in a CdTe quantum well. Our method, relying on the exchange interaction between localized excitons and paramagnetic impurities, can in principle be applied to entangle an arbitrarily large number of spins.
Bao
Jiming
J
FOCUS Center and Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1120, USA.
Bragas
Andrea V
AV
Furdyna
Jacek K
JK
Merlin
Roberto
R
D002104:Cadmium / Q000737:chemistry; D004583:Electrons; D004601:Elementary Particles; D008280:Magnetics; D008345:Manganese / Q000737:chemistry; D055095:Optics and Photonics; D012666:Semiconductors; D013059:Spectrum Analysis, Raman; D013691:Tellurium / Q000737:chemistry
D002104:Cadmium; D008345:Manganese; D013691:Tellurium