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Abstract:

A quantum-mechanical many-particle system may exhibit nonlocal behavior in that measurements performed on one of the particles can affect a second one that is far apart. These so-called entangled states are crucial for the implementation of quantum information protocols and gates for quantum computation. Here, we use ultrafast optical pulses and coherent pump-probe techniques to create and control spin entangled states in an ensemble of up to three non-interacting electrons bound to donors in a Cd 1-xMn xTe quantum well. Our method, relying on the exchange interaction between optically excited excitons and the paramagnetic impurities, can in principle be applied to entangle an arbitrarily large number of electrons. A microscopic theory of impulsive stimulated Raman scattering and a model for multi-spin entanglement are presented. The signature of entanglement is the observation of overtones of donor spin-flips in the differential reflectivity of the probe pulse. Results are shown for resonant excitation of localized excitons below the gap, and above the gap where the signatures of entanglement are significantly enhanced. Data is also presented on the generation of coherent excitations of antiferromagnetically coupled manganese pairs, folded acoustic phonons, exciton Zeeman beats and entanglement involving two Mn +2 ions. ©2005 The American Physical Society.

Registro:

Documento: Artículo
Título:Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in a Cd 1-xMn xTe quantum well
Autor:Bao, J.M.; Bragas, A.V.; Furdyna, J.K.; Merlin, R.
Filiación:FOCUS Center, Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120, United States
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, United States
Div. of Eng. and Applied Sciences, Harvard University, Cambridge, MA 02138, United States
FCEyN, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:acceleration; article; electron; mathematical analysis; mathematical computing; quantum mechanics; Raman spectrometry
Año:2005
Volumen:71
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevB.71.045314
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v71_n4_p_Bao

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Citas:

---------- APA ----------
Bao, J.M., Bragas, A.V., Furdyna, J.K. & Merlin, R. (2005) . Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in a Cd 1-xMn xTe quantum well. Physical Review B - Condensed Matter and Materials Physics, 71(4).
http://dx.doi.org/10.1103/PhysRevB.71.045314
---------- CHICAGO ----------
Bao, J.M., Bragas, A.V., Furdyna, J.K., Merlin, R. "Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in a Cd 1-xMn xTe quantum well" . Physical Review B - Condensed Matter and Materials Physics 71, no. 4 (2005).
http://dx.doi.org/10.1103/PhysRevB.71.045314
---------- MLA ----------
Bao, J.M., Bragas, A.V., Furdyna, J.K., Merlin, R. "Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in a Cd 1-xMn xTe quantum well" . Physical Review B - Condensed Matter and Materials Physics, vol. 71, no. 4, 2005.
http://dx.doi.org/10.1103/PhysRevB.71.045314
---------- VANCOUVER ----------
Bao, J.M., Bragas, A.V., Furdyna, J.K., Merlin, R. Control of spin dynamics with laser pulses: Generation of entangled states of donor-bound electrons in a Cd 1-xMn xTe quantum well. Phys. Rev. B Condens. Matter Mater. Phys. 2005;71(4).
http://dx.doi.org/10.1103/PhysRevB.71.045314