Lindblad Dynamics and Disentanglement in Multi-Mode Bosonic Systems

In this paper, we consider the thermal bath Lindblad master equation to describe the quantum nonunitary dynamics of quantum states in a multi-mode bosonic system. For the two-mode bosonic system interacting with an environment, we analyse how both the coupling between the modes and the coupling with the environment characterised by the frequency and the relaxation rate vectors affect dynamics of the entanglement. We discuss how the revivals of entanglement can be induced by the dynamic coupling between the different modes. For the system, initially prepared in a two-mode squeezed state, we find the logarithmic negativity as defined by the magnitude and orientation of the frequency and the relaxation rate vectors. We show that, in the regime of finite-time disentanglement, reorientation of the relaxation rate vector may significantly increase the time of disentanglement.

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Entanglement Generation in Two-Mode Gaussian Systems in a Thermal Environment

Open Systems & Information Dynamics ◽

10.1142/s1230161216500074 ◽

2016 ◽

Vol 23 (01) ◽

pp. 1650007 ◽

Cited By ~ 6

Author(s):

Aurelian Isar

Keyword(s):

Open Systems ◽

Thermal Environment ◽

Thermal Bath ◽

Infinite Time ◽

Entanglement Generation ◽

Logarithmic Negativity ◽

Quantum Dynamical ◽

Strength Of Interaction ◽

Initial States ◽

Thermal States

We describe the evolution of the quantum entanglement in a system composed of two interacting bosonic modes immersed in a thermal reservoir, in the framework of the theory of open systems based on completely positive quantum dynamical semigroups. The evolution of entanglement is described in terms of the covariance matrix for Gaussian initial states. We calculate the logarithmic negativity and show that for separable initial squeezed thermal states entanglement generation may take place, for definite values of squeezing parameter, average photon numbers, temperature of the thermal bath, dissipation constant and the strength of interaction between the two modes. After its generation one can observe temporary suppressions and revivals of the entanglement. For entangled initial squeezed thermal states, entanglement suppression takes place, for all temperatures of the reservoir, and temporary revivals and suppressions of entanglement can be observed too. In the limit of infinite time the system evolves asymptotically to an equilibrium state which may be entangled or separable.

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Transformations properties of quantum optical signals in phase modulator

EPJ Web of Conferences ◽

10.1051/epjconf/201922002017 ◽

2019 ◽

Vol 220 ◽

pp. 02017

Author(s):

Alexander Trifanov ◽

Ekaterina Trifanova

Keyword(s):

Phase Modulation ◽

Classical Model ◽

Optical Modulator ◽

Squeezed State ◽

Optical Signals ◽

Semiclassical Model ◽

Electro Optical Modulator ◽

Quantum Optical ◽

Modulated Light ◽

Multi Mode

We investigate evolution of multimode quantum light in electro-optical modulator, using semiclassical model of phase modulation process. For the case of monochromatic incoming signal, we consider transformation of its spectrum and calculate statistical properties of each frequency mode. Particularly, we find that for the case of initial coherent state our result is covered by the well-known classical model. While for the case of initially squeezed state we observe single- and multi-mode squeezing in frequency spectrum of modulated light.

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Multi-mode light microscopy of microtubule assembly dynamics and chromosome movement in vivo and In vitro

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100166117 ◽

1996 ◽

Vol 54 ◽

pp. 730-731

Author(s):

E. D. Salmon ◽

J. C. Waters ◽

C. Waterman-Storer

Keyword(s):

Imaging System ◽

Ccd Camera ◽

Transmitted Light ◽

Microtubule Assembly ◽

Live Cells ◽

Optical Efficiency ◽

Multiple Band ◽

Multi Mode

We have developed a multi-mode digital imaging system which acquires images with a cooled CCD camera (Figure 1). A multiple band pass dichromatic mirror and robotically controlled filter wheels provide wavelength selection for epi-fluorescence. Shutters select illumination either by epi-fluorescence or by transmitted light for phase contrast or DIC. Many of our experiments involve investigations of spindle assembly dynamics and chromosome movements in live cells or unfixed reconstituted preparations in vitro in which photodamage and phototoxicity are major concerns. As a consequence, a major factor in the design was optical efficiency: achieving the highest image quality with the least number of illumination photons. This principle applies to both epi-fluorescence and transmitted light imaging modes. In living cells and extracts, microtubules are visualized using X-rhodamine labeled tubulin. Photoactivation of C2CF-fluorescein labeled tubulin is used to locally mark microtubules in studies of microtubule dynamics and translocation. Chromosomes are labeled with DAPI or Hoechst DNA intercalating dyes.

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A mind full of happiness: How mindfulness shapes affect dynamics in daily life.

Emotion ◽

10.1037/emo0000562 ◽

2020 ◽

Vol 20 (3) ◽

pp. 436-451 ◽

Cited By ~ 2

Author(s):

Zarah Rowland ◽

Mario Wenzel ◽

Thomas Kubiak

Keyword(s):

Daily Life ◽

Affect Dynamics

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Analysis of the backbone dynamics of capsicein using 15N NMR relaxation rate measurements

Journal de Chimie Physique ◽

10.1051/jcp/1994910776 ◽

1994 ◽

Vol 91 ◽

pp. 776-784

Author(s):

C van Heijenoort ◽

S Bouaziz ◽

E Guittet

Keyword(s):

Relaxation Rate ◽

Nmr Relaxation ◽

Backbone Dynamics ◽

15N Nmr ◽

15N Nmr Relaxation

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Magnetic resonance image attributes of the bovine ovarian follicle antrum during development and regression

Reproduction ◽

10.1530/reprod/120.2.311 ◽

2000 ◽

pp. 311-323 ◽

Cited By ~ 3

Author(s):

JL Hilton ◽

GE Sarty ◽

GP Adams ◽

RA Pierson

Keyword(s):

Magnetic Resonance ◽

Relaxation Rate ◽

Follicular Fluid ◽

Magnetic Resonance Image ◽

Follicular Development ◽

Physiological Status ◽

Proton Density ◽

Dominant Follicle ◽

Rate Heterogeneity ◽

Pixel Value

The magnetic resonance images and maps of bovine ovaries acquired at defined phases of follicular development and regression were studied to determine whether magnetic resonance image attributes of the follicular antrum reflect the physiological status of dominant and subordinate ovarian follicles. Ovariectomies were performed at day 3 of wave one, day 6 of wave one, day 1 of wave two and at >/= day 17 after ovulation. The timings of ovariectomies were selected to acquire growing, early static, late static and regressing follicles of the first wave and preovulatory follicles of the ovulatory wave. Pre-selection and subordinate follicles were also available for analysis. Serum samples were taken on the day of ovariectomy and follicular fluid samples were taken after imaging. Numerical pixel value and pixel heterogeneity in a spot representing approximately 95% of the follicular antrum were quantified in T(1)- and T(2)-weighted images. T(1) and T(2) relaxation rates (T(1) and T(2)), proton density, apparent diffusion coefficients and their heterogeneities were determined from the computed magnetic resonance maps. The antra of early atretic dominant follicles showed higher T(2)-weighted mean pixel value (P < 0.008) and heterogeneity (P < 0. 01) and lower T(2) heterogeneity (P < 0.008) than growing follicles. Subordinate follicles in the presence of a preovulatory dominant follicle had higher T(1), T(1) heterogeneity, proton density, proton density heterogeneity, and lower mean pixel value in T(1)-weighted images than subordinate follicles of the anovulatory wave (P < 0.04). T(1) relaxation rate heterogeneity and proton density heterogeneity were positively correlated with follicular fluid oestradiol concentration (r = 0.4 and 0.3; P < 0.04). T(2) relaxation rate heterogeneity was positively correlated with follicular fluid progesterone concentration (r = 0.4; P < 0.008). Quantitative differences in magnetic resonance image attributes of the antrum observed among phases of follicular development and regression coincided with changes in the ability of the dominant follicle to produce steroid hormones and ovulate, and thus were indicative of physiological status and follicular health.

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