Navegar

Colección

Datos Estadísticas

Artículo

La versión final de este artículo es de uso interno. El editor solo permite incluir en el repositorio el artículo en su versión post-print. Por favor, si usted la posee enviela a
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

We analyze the evolution of the Gaussian discord between two resonant harmonic oscillators coupled to a common environment. For this, we use the same tools we applied before to fully characterize the evolution of the entanglement in this system. The asymptotic value of Gaussian discord is obtained as a function of parameters characterizing the environment (temperature, couplings, etc.) and the initial state of the system (initial squeezing, initial purity, etc.) The type of Gaussian measurement optimizing the extraction of information between the oscillators is fully characterized by means of a phase diagram. Such a diagram (with phases corresponding to homodyne or heterodyne measurements) has similar topology to the one describing dynamical phases for the entanglement. We present evidence pointing to the fact that Gaussian discord is not always a good approximation of true discord as the asymptotic value of the former is shown to be a nondecreasing function of temperature (in the high-temperature regime), reaching an asymptotic value of ln(2) for a pure initial state (and lower values for mixed initial states). © 2012 American Physical Society.

Registro:

Documento: Artículo
Título:Dynamics of Gaussian discord between two oscillators interacting with a common environment
Autor:Freitas, J.N.; Paz, J.P.
Filiación:Departamento de Física Juan José Giambiagi, FCEyN, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Instituto de Física de Buenos Aires, IFIBA, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Asymptotic values; Common environment; Dynamical phasis; Extraction of information; Gaussian measurements; Gaussians; Heterodyne measurement; High-temperature regime; Homodynes; Initial state; Non-decreasing functions; Parameters characterizing; Resonant harmonics; Two oscillators; Phase diagrams; Gaussian distribution
Año:2012
Volumen:85
Número:3
DOI: http://dx.doi.org/10.1103/PhysRevA.85.032118
Título revista:Physical Review A - Atomic, Molecular, and Optical Physics
Título revista abreviado:Phys Rev A
ISSN:10502947
CODEN:PLRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v85_n3_p_Freitas

Referencias:

  • Ollivier, H., Zurek, W.H., (2001) Phys. Rev. Lett., 88, p. 15. , 0031-9007 10.1103/PhysRevLett.88.017901
  • Knill, E., Laflamme, R., (1998) Phys. Rev. Lett., 81, p. 5672. , PRLTAO 0031-9007 10.1103/PhysRevLett.81.5672
  • Datta, A., Shaji, A., Caves, C.M., Quantum discord and the power of one qubit (2008) Physical Review Letters, 100 (5), p. 050502. , http://oai.aps.org/oai?verb=GetRecord&Identifier=oai:aps.org: PhysRevLett.100.050502&metadataPrefix=oai_apsmeta_2, DOI 10.1103/PhysRevLett.100.050502
  • Shabani, A., Lidar, D.A., (2009) Phys. Rev. Lett., 102, p. 100402. , PRLTAO 0031-9007 10.1103/PhysRevLett.102.100402
  • Madhok, V., Datta, A., (2011) Phys. Rev. A, 83, p. 032323. , PLRAAN 1050-2947 10.1103/PhysRevA.83.032323
  • Cavalcanti, D., Aolita, L., Boixo, S., Modi, K., Piani, M., Winter, A., (2011) Phys. Rev. A, 83, p. 032324. , PLRAAN 1050-2947 10.1103/PhysRevA.83.032324
  • Wang, B., Xu, Z.Y., Chen, Z.Q., Feng, M., (2010) Phys. Rev. A, 81, p. 014101. , PLRAAN 1050-2947 10.1103/PhysRevA.81.014101
  • Fanchini, F.F., Werlang, T., Brasil, C.A., Arruda, L.G.E., Caldeira, A.O., (2010) Phys. Rev. A, 81, p. 052107. , PLRAAN 1050-2947 10.1103/PhysRevA.81.044101
  • Werlang, T., Souza, S., Fanchini, F.F., Villas Boas, C.J., (2009) Phys. Rev. A, 80, p. 024103. , PLRAAN 1050-2947 10.1103/PhysRevA.80.024103
  • Adesso, G., Datta, A., (2010) Phys. Rev. Lett., 105, p. 30501. , PRLTAO 0031-9007 10.1103/PhysRevLett.105.030501
  • Giorda, P., Paris, M.G.A., (2010) Phys. Rev. Lett., 105, p. 20503. , PRLTAO 0031-9007 10.1103/PhysRevLett.105.020503
  • Paz, J.P., Roncaglia, A.J., (2009) Phys. Rev. A, 79, p. 032102. , PLRAAN 1050-2947 10.1103/PhysRevA.79.032102
  • Paz, J.P., Roncaglia, A.J., (2008) Phys. Rev. Lett., 100, p. 220401. , PRLTAO 0031-9007 10.1103/PhysRevLett.100.220401
  • Vasile, R., Giorda, P., Olivares, S., Paris, M., Maniscalco, S., (2010) Phys. Rev. A, 82, p. 012313. , PLRAAN 1050-2947 10.1103/PhysRevA.82.012313
  • Hu, B.L., Paz, J.P., Zhang, Y., (1992) Phys. Rev. D, 45, p. 2843. , 1550-7998 10.1103/PhysRevD.45.2843

Citas:

---------- APA ----------
Freitas, J.N. & Paz, J.P. (2012) . Dynamics of Gaussian discord between two oscillators interacting with a common environment. Physical Review A - Atomic, Molecular, and Optical Physics, 85(3).
http://dx.doi.org/10.1103/PhysRevA.85.032118
---------- CHICAGO ----------
Freitas, J.N., Paz, J.P. "Dynamics of Gaussian discord between two oscillators interacting with a common environment" . Physical Review A - Atomic, Molecular, and Optical Physics 85, no. 3 (2012).
http://dx.doi.org/10.1103/PhysRevA.85.032118
---------- MLA ----------
Freitas, J.N., Paz, J.P. "Dynamics of Gaussian discord between two oscillators interacting with a common environment" . Physical Review A - Atomic, Molecular, and Optical Physics, vol. 85, no. 3, 2012.
http://dx.doi.org/10.1103/PhysRevA.85.032118
---------- VANCOUVER ----------
Freitas, J.N., Paz, J.P. Dynamics of Gaussian discord between two oscillators interacting with a common environment. Phys Rev A. 2012;85(3).
http://dx.doi.org/10.1103/PhysRevA.85.032118