ENTANGLEMENT FOR THE TWO-MODE FIELD IN THREE-LEVEL ATOMIC SYSTEMS

2007 ◽  
Vol 21 (13) ◽  
pp. 781-788 ◽  
Author(s):  
BO ZHANG ◽  
GUO-QIN GE ◽  
YUN-XIA PING

We investigate entanglement for the two-mode field in three-level atomic systems. Entanglement of the system is demonstrated according to the Duan's criterion.16 It shows that the entanglement has a close relation with the pump intensity. For large pump intensity, particular choice of its phase, zero detuning and cooperativity parameter, perfect entanglement for the two-mode field can be generated outside the cavity.

2021 ◽  
pp. 2150060
Author(s):  
N. H. Abd El-Wahab ◽  
R. A. Zait

We consider a generalized multi-photon interaction of two collectively two-level atoms with two-mode of electromagnetic field in the presence of Kerr medium and intensity-dependent coupling. We show that this atomic system possesses supersymmetric structure. We solved this system by virtue of supersymmetric unitary transformation. The supersymmetric generators of this atomic system are constructed. The diagonalization of the corresponding Hamiltonian is performed by introducing a supersymmetric unitary transformation. Accordingly, the eigenvalues and eigenfunctions of the Hamiltonian of the atomic system are obtained. The time evolution of the atom–field wave functions is derived in an exact form for two cases of the initial states of the atoms and the field modes. Some quantum effects such as the second-order correlation function, cross-correlation, purity and Husimi Q-function are investigated. The effects of the Kerr medium, detuning parameter, intensity-dependent coupling and multi-photon transition on the evolution of these quantum effects are examined. We conclude that the supersymmetric unitary transformation method is very simple and can be applied to a variety of atomic systems which possess a supersymmetric structure.


Ramus ◽  
1985 ◽  
Vol 14 (2) ◽  
pp. 75-84 ◽  
Author(s):  
Graham Ley ◽  
Michael Ewans

For some years past there has been a welcome change of emphasis towards the consideration of staging in books published on Greek tragedy; and yet with that change also a curious failure to be explicit about the central problem connected with all stagecraft, namely that of the acting-area. In this study two scholars with considerable experience of teaching classical drama in performance consider this problem of the acting-area in close relation to major scenes from two Greek tragedies, and suggest some general conclusions. The article must stand to some extent as a critique of the succession of books that has followed the apparently pioneering study of Oliver Taplin, none of which has made any substantial or sustained attempt to indicate where actors might have acted in the performance of Greek tragedy, though most, if not all, have been prepared to discard the concept of a raised ‘stage’ behind the orchestra. Hippolytus (428 BC) is the earliest of the surviving plays of Euripides to involve three speaking actors in one scene. Both Alcestis (438 BC and Medea (431 BC almost certainly require three actors to be performed with any fluency, but surprisingly present their action largely through dialogue and confrontation — surprisingly, perhaps, because at least since 458 BC and the performance of the Oresteia it is clear that three actors were available to any playwright.


2019 ◽  
Vol 16 (2) ◽  
pp. 265-271
Author(s):  
Claudia Lintner

This article analyses the relationship between migrant entrepreneurship, marginalisation and social innovation. It does so, by looking how their ‘otherness’ is used on the one hand to reproduce their marginalised situation in society and on the other to develop new living and working arrangements promoting social innovation in society. The paper is based on a qualitative study, which was carried out from March 2014- 2016. In this period, twenty semi-structured interviews were conducted with migrant entrepreneurs and experts. As the results show, migrant entrepreneurs are characterised by a false dichotomy of “native weakness” in economic self-organisation against the “classical strength” of majority entrepreneurs. It is shown that new possibilities of acting in the context of migrant entrepreneurship are mostly organised in close relation to the lifeworlds and specific needs deriving from this sphere. Social innovation processes initiated by migrant entrepreneurs through their economic activities thus develop on a micro level and are hence less apparent. Supportive networks are missing on a structural level, so it becomes difficult for single innovative initiatives to be long-lasting.


2020 ◽  
Vol 11 (2) ◽  
pp. 139
Author(s):  
Priyo Joko Purnomo ◽  
Wahyudhi Wahyudhi

Gambuh as the performing art in Malay area became one of the cultural transformation evidences of the close relation between Java and Malay. The history of gambuh performance in Malay area recorded in the archipelago’s manuscripts, one of them is a manuscript entitled Surat Gambuh which is being the collection of Leiden University Library. This paper attempts to examine the contents of the manuscript in order to reconstruct the gambuh performance art in Malay and also trace the historical aspects. As far as the research had been done, there have been no studies of this manuscript so it is necessary to first transliterate it using a critical method. Furthermore, the historical aspects are explored using a historical approach by adding data from other texts of Panji. The analysis result of the reflection of Malay gambuh performance rules and historical aspects show that there is a transformation of work from oral tradition to written tradition, the cultural acculturation between Java and Malay, and the Islamic influence behind Malay gambuh.


2017 ◽  
Vol 31 (2) ◽  
pp. 67-74
Author(s):  
G. V. Yakshibaeva

The problem of providing the most efficient and rational selection, distribution, use of migrant workers, with regard to both internal and external migration in close relation to socio-economic and demographic interests of the state are currently of particular relevance. Scientific novelty of work consists in the identification of factors and directions of flows as departing and arriving labor migrants in the Republic of Bashkortostan, the characteristics of the development of labour migration and its impact on employment, which allowed to identify problems and negative trends.


1989 ◽  
Vol 25 (8) ◽  
pp. 493
Author(s):  
M. Ohashi ◽  
N. Shibata ◽  
K. Sato

1989 ◽  
Vol 25 (2) ◽  
pp. 142 ◽  
Author(s):  
G.L. Tangonan ◽  
H.P. Hsu ◽  
V. Jones ◽  
J. Pikulski

Author(s):  
Matthias Armgardt

AbstractReuven Yaron (1924–2014) in memoriamThe importance of Ancient Jewish Law for Roman Law and Ancient Legal History – the example of the Rabbinic reception and modification of the Greco-Hellenistic diathēkē as dîjathîqî and the donatio mortis causa. This paper aims to show that ancient Jewish law is of greatest importance for interpreting Roman law and understanding ancient legal history. After exemplifying the close relation of the Pentateuch and the cuneiform law, we focus on the reception and modification of the Greco-Hellenistic diathēkē (testament), which came into Jewish law during tannaitic times as dîjathîqî and was reinterpreted by the rabbis as donation. Finally, we compare the rabbinic dîjathîqî and the Roman donatio mortis causa.


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