Large dynamic light-matter entanglement from driving ...
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Large dynamic light-matter entanglement from drivingneither too fast nor too slow
Alvaro Jose Gonzalez1
1Departamento de FısicaUniversidad de los Andes
Seminario Optica Cuantica, 2017
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 1 /
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Outline
1 IntroduccionModelo de Dicke (DM)Medidas de entanglement entre dos sistemas
2 Nuevo regimen de comportamiento dinamico de radiacion-materiaEvolucion temporal del sistemaPersistencia de los resultados
3 Gas super fluido en una cavidad optica
4 Conclusiones
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 2 /
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Outline
1 IntroduccionModelo de Dicke (DM)Medidas de entanglement entre dos sistemas
2 Nuevo regimen de comportamiento dinamico de radiacion-materiaEvolucion temporal del sistemaPersistencia de los resultados
3 Gas super fluido en una cavidad optica
4 Conclusiones
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 3 /
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Hamiltoniano DM
Describe el comportamiento de un sistema compuesto por N qubits demateria interactuando con un unico modo de radiacion (Luz) siguiendo elsiguiente hamiltoniano
H = εJz + ωa†a + 2λ(t)√NJx(a† + a)
Donde el operador
Ji = 12
∑Nj=1 σ
(j)i
denota los operadores colectivos de los N qubits. y λ(t) representa lafuerza de interaccion radiacion-materia en un tiempo t
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QFT en el DM
En el limite termodinamico N →∞ el hamiltoniano del DM puedepresentar una transicion de fase
lo que implica un cambio significativo en el estado base del DM. En la fasesuperradiante
< Nrad >=< a†a >6= 0
< NQ >=< ˆJz + N2 >6= 0
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 5 /
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Outline
1 IntroduccionModelo de Dicke (DM)Medidas de entanglement entre dos sistemas
2 Nuevo regimen de comportamiento dinamico de radiacion-materiaEvolucion temporal del sistemaPersistencia de los resultados
3 Gas super fluido en una cavidad optica
4 Conclusiones
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 6 /
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Entropia de von Neumann SN
Dado un sistema compuesto (A,B), la entropia de von Neumen se definepara el subsitema A como:
SN = −tr{ρAln(ρA)}, ρA = trB{|ψ〉 〈ψ|}
y su valor representa el intercambio irreversible de informacion entre lossubsistemas, de tal manera que:
SN = 0⇒ |ψ〉 = |ψ〉Q ⊗ |ψ〉rad
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Negatividad Cuantica
Si el sistema ahora esta abierto
|ψ〉 → ρ
SN ya no es un buen testigo de entanglement y se debe definir lanegatividad cuantica como:
N−(ρ) = ||ρΓq ||−12
donde, para estados entangled se tiene que
N−(ρ) 6= 0
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Outline
1 IntroduccionModelo de Dicke (DM)Medidas de entanglement entre dos sistemas
2 Nuevo regimen de comportamiento dinamico de radiacion-materiaEvolucion temporal del sistemaPersistencia de los resultados
3 Gas super fluido en una cavidad optica
4 Conclusiones
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Annealing parameter
El Annealing parameter, representa el grado de interaccion existen deentra la radiacion y la materia en el tiempo.
λ(t) = vt
ω = ε
λc = 0.5
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Estado puro
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 11 /
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Outline
1 IntroduccionModelo de Dicke (DM)Medidas de entanglement entre dos sistemas
2 Nuevo regimen de comportamiento dinamico de radiacion-materiaEvolucion temporal del sistemaPersistencia de los resultados
3 Gas super fluido en una cavidad optica
4 Conclusiones
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 12 /
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Dependencia del Annealing velocity con N
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Sistema cuantico abierto
La evolucion temporal para la matriz densidad del sistema, se puedemodelar por una ecuacion maestra en forma de Linbland:
ddt ρ = −i [H, ρ] + 2κ(n + 1)D(ρ; a) + 2κnD(ρ; a)
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Disipacion
Alvaro Jose Gonzalez (Universidad de los Andes)Large dynamic light-matter entanglement from driving neither too fast nor too slowSeminario Optica Cuantica, 2017 15 /
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BEC en una cavidad
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Conclusiones
Se descubrio un regimen dinamico donde el entanglementradiacion-materia se logra para velocidades intermedias
Se argumento, que los resultados persisten bajo condiciones masrealistas, correspondientes a N muy grandes y a la presencia defactores de disipacion
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bibliografıa
Acevedo, O. L., Quiroga, L., Rodrıguez, F. J., Johnson, N. F. (2015).Large dynamic light-matter entanglement from driving neither toofast nor too slow. Physical Review A, 92(3), 032330.
Baumann, K., Guerlin, C., Brennecke, F., Esslinger, T. (2010). Dickequantum phase transition with a superfluid gas in an optical cavity.Nature, 464(7293), 1301-1306.
Emary, C., Brandes, T. (2003). Chaos and the quantum phasetransition in the Dicke model. Physical Review E, 67(6), 066203.
Gomez-Ruiz, F. J., Acevedo, O. L., Quiroga, L., Rodrıguez, F. J.,Johnson, N. F. (2016). Quantum Hysteresis in Coupled Light–MatterSystems. Entropy, 18(9), 319.
Acevedo, O. L., Quiroga, L., Rodrıguez, F. J., Johnson, N. F. (2015).Robust quantum correlations in out-of-equilibrium matter–lightsystems. New Journal of Physics, 17(9), 093005.
Amico, L., Fazio, R., Osterloh, A., Vedral, V. (2008). Entanglementin many-body systems. Reviews of Modern Physics, 80(2), 517.
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