¡Nos trasladamos! E-Prints cerrará el 7 de junio.

En las próximas semanas vamos a migrar nuestro repositorio a una nueva plataforma con muchas funcionalidades nuevas. En esta migración las fechas clave del proceso son las siguientes:

Es muy importante que cualquier depósito se realice en E-Prints Complutense antes del 7 de junio. En caso de urgencia para realizar un depósito, se puede comunicar a docta@ucm.es.

Linear response theory for quantum Gaussian processes



Downloads per month over past year

Mehboudi, Mohammad and Rodríguez Parrondo, Juan Manuel and Acin, Antonio (2019) Linear response theory for quantum Gaussian processes. New journal of physics, 21 . ISSN 1367-2630

[thumbnail of RParrondo28libre+CC.pdf]
Creative Commons Attribution.


Official URL: http://dx.doi.org/10.1088/1367-2630/ab30f4


Fluctuation dissipation theorems (FDTs) connect the linear response of a physical system to a perturbation to the steady-state correlation functions. Until now, most of these theorems have been derived for finite-dimensional systems. However, many relevant physical processes are described by systems of infinite dimension in the Gaussian regime. In this work, we find a linear response theory for quantum Gaussian systems subject to time dependent Gaussian channels. In particular, we establish a FDT for the covariance matrix that connects its linear response at any time to the steady state two-time correlations. The theorem covers non-equilibrium scenarios as it does not require the steady state to be at thermal equilibrium. We further show how our results simplify the study of Gaussian systems subject to a time dependent Lindbladian master equation. Finally, we illustrate the usage of our new scheme through some examples. Due to broad generality of the Gaussian formalism, we expect our results to find an application in many physical platforms, such as opto-mechanical systems in the presence of external noise or driven quantum heat devices.

Item Type:Article
Additional Information:

© 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. We thank Anna Sanpera, Andreu Riera-Campeny, and Janek Kolodynski for fruitful discussions. Support from the Spanish MINECO (QIBEQI FIS2016-80773-P, ConTrAct FIS2017-83709-R, and Severo Ochoa SEV-2015-0522), the ERC CoG QITBOX, the AXA Chair in Quantum Information Science, Fundacio Privada Cellex, and the Generalitat de Catalunya (CERCA Program and SGR1381) is acknowledged.

Uncontrolled Keywords:Fluctuation-dissipation; Entanglement; Information; Systems; Noise
Subjects:Sciences > Physics > Nuclear physics
ID Code:58029
Deposited On:12 Dec 2019 12:39
Last Modified:12 Dec 2019 13:32

Origin of downloads

Repository Staff Only: item control page