Abstract:
We study the optically induced effective interaction between spins in micropillars. Our theoretical model describes a circularly polarized cavity mode strongly coupled to two quantum-dot excitons, each of which interacts with a localized spin. The decoherence effect inducing a finite lifetime to the cavity mode is included. Using the master equation for the density matrix we investigate the dynamics under low-power excitation. In the absence of decoherence, we recover the result obtained in a previous work (which uses conventional low-energy reduction procedures) for an effective Hamiltonian containing a Zeeman term and an Ising interaction between the localized spins. For finite cavity-photon lifetime we employ Fourier analysis on the time dependence of the nondiagonal element of the reduced density matrix, obtained by tracing out the photons and excitons, to find a quasieffective spin-spin Ising Hamiltonian. This Hamiltonian is a possible building block for two-qubit quantum computing operation. We study how decoherence affects the construction of that effective interaction. Finally, we discuss the possible application for transition-metal impurity spins embedded in CdTe quantum dots. © 2012 American Physical Society.
Registro:
Documento: |
Artículo
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Título: | Effective Hamiltonian for the impurity-impurity interaction in micropillars in the presence of decoherence |
Autor: | Andrade, J.A.; Aligia, A.A.; Quinteiro, G.F. |
Filiación: | Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 Bariloche, Argentina Departamento de Física and IFIBA, FCEyN, Ciudad Universitaria, Pabellón 1, 1428 Buenos Aires, Argentina
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Año: | 2012
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Volumen: | 85
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Número: | 16
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DOI: |
http://dx.doi.org/10.1103/PhysRevB.85.165421 |
Título revista: | Physical Review B - Condensed Matter and Materials Physics
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Título revista abreviado: | Phys. Rev. B Condens. Matter Mater. Phys.
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ISSN: | 10980121
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CODEN: | PRBMD
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v85_n16_p_Andrade |
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Citas:
---------- APA ----------
Andrade, J.A., Aligia, A.A. & Quinteiro, G.F.
(2012)
. Effective Hamiltonian for the impurity-impurity interaction in micropillars in the presence of decoherence. Physical Review B - Condensed Matter and Materials Physics, 85(16).
http://dx.doi.org/10.1103/PhysRevB.85.165421---------- CHICAGO ----------
Andrade, J.A., Aligia, A.A., Quinteiro, G.F.
"Effective Hamiltonian for the impurity-impurity interaction in micropillars in the presence of decoherence"
. Physical Review B - Condensed Matter and Materials Physics 85, no. 16
(2012).
http://dx.doi.org/10.1103/PhysRevB.85.165421---------- MLA ----------
Andrade, J.A., Aligia, A.A., Quinteiro, G.F.
"Effective Hamiltonian for the impurity-impurity interaction in micropillars in the presence of decoherence"
. Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 16, 2012.
http://dx.doi.org/10.1103/PhysRevB.85.165421---------- VANCOUVER ----------
Andrade, J.A., Aligia, A.A., Quinteiro, G.F. Effective Hamiltonian for the impurity-impurity interaction in micropillars in the presence of decoherence. Phys. Rev. B Condens. Matter Mater. Phys. 2012;85(16).
http://dx.doi.org/10.1103/PhysRevB.85.165421