22282 research outputs found
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Enhancing multiphoton rates with quantum memories
No full textSingle photons are a vital resource for optical quantum information processing. Efficient and deterministic single photon sources do not yet exist, however. To date, experimental demonstrations of quantum processing primitives have been implemented using non-deterministic sources combined with heralding and/or postselection. Unfortunately, even for eight photons, the data rates are already so low as to make most experiments impracticable. It is well known that quantum memories, capable of storing photons until they are needed, are a potential solution to this `scaling catastrophe'. Here, we analyze in detail the benefits of quantum memories for producing multiphoton states, showing how the production rates can be enhanced by many orders of magnitude. We identify the quantity as the most important figure of merit in this connection, where and are the efficiency and time-bandwidth product of the memories, respectively
The Royal Academy of Arts Audio Project
No full textThe Royal Academy Audio Project
Overview
The Royal Academy Audio Project (RAAP) is an on-going practical research project, sponsored by The Contemporary Circle on behalf of the Royal Academy of Art Library.
Aims
The primary purpose of this project is to record a series of interviews with leading Royal Academicians, concentrating on their professional career, and their relationship with the Royal Academy of Art.
Many of the most influential artists of the 20th Century are now of an advanced age and whilst some have been interviewed in the past, many have not – certainly not in a considered and rigorous manner. This project will seek to address that before it is too late. The Library have identified upwards of seventy Royal Academicians that they believe should be included. It is anticipated that RAAP will look to record twelve subjects per year.
Outcomes
The bulk of the material is intended for archive within the Royal Academy of Art library as primary source material for researchers and academics.
1. The completely unedited recordings – the non-mediated audio texts.
2. The ‘Umm & Ah’ Edit – removal of the hesitations and repetitions of all interviews.
3. The 45 Minute Documentary – the mediated text intended as a potentially ‘commercial’ and ‘engaging’ output for educated but uninformed listeners (based on the BBC Reithian precept).
4. Transcription texts of all the interviews (post ‘Umm & Ah’ edit)
Production Breakdown
Interview 1: The artist in his/her studio or workspace
Interview 2: The artist in the sound studio at Royal Holloway
Interview 3: With another RA artist commenting upon the work of the subject.
Interview 4: A recorded conversation between the subject and the commenting artist.
The Radio Documentary – constructed from all the interviews
Personnel
Rhys Davies – Editor (archive) Producer & Studio Presenter (Documentary)
Dr Jean Wainwright – Researcher and Interviewer.
rhysdavies201
A Penrose polynomial for embedded graphs
No full textWe extend the Penrose polynomial, originally defined only for plane graphs, to graphs embedded in arbitrary surfaces. Considering this Penrose polynomial of embedded graphs leads to new identities and relations for the Penrose polynomial which can not be realized within the class of plane graphs. In particular, by exploiting connections with the transition polynomial and the ribbon group action, we find a deletion-contraction-type relation for the Penrose polynomial. We relate the Penrose polynomial of an orientable checkerboard colourable graph to the circuit partition polynomial of its medial graph and use this to find new combinatorial interpretations of the Penrose polynomial. We also show that the Penrose polynomial of a plane graph G can be expressed as a sum of chromatic polynomials of twisted duals of G. This allows us to obtain a new reformulation of the Four Colour Theorem
Superconducting phase coherent electron transport in nano-engineered ferromagnetic vortices
No full textThis thesis presents an experimental study of the superconducting proximity effect in sub-micrometer sized ferromagnetic discs. Such discs belong to a class of mesoscopic ferromagnets intermediate between microscopic magnets with dimensions below about 10nm that behave as single giant spins and macroscopic structures that are larger than approximately 1 micrometer where domains are formed to minimise stray fields. The magnetic structure of mesoscopic magnets is strongly dependent on their geometric shape, allowing for purposeful engineering of magnetic structures using modern lithographic techniques. The ground magnetic state of mesoscopic ferromagnetic discs is the magnetic vortex where unusual time-asymmetric triplet superconductivity is predicted to exist and survive up to the non-magnetic coherence length, that is orders in magnitude larger than the ferromagnetic singlet coherence length. Magnetic Force Microscopy (MFM) was used to directly study the magnetic structure of the discs. To detect the proximity effect in the vortices, Andreev interferometers were used with normal parts replaced with mesoscopic ferromagnetic discs in the magnetic vortex state. The samples were fabricated using electron-beam lithography and a modified shadow evaporation technique developed within this project, allowing the whole structure to be made with highly precise alignment, without breaking vacuum and avoiding redundant ferromagnetic elements disturbing the magnetic vortices. Observations were made of superconducting phase periodic oscillations in the conductance of the Andreev interferometers. Such oscillations provide unambiguous evidence of phase coherent electron transport through the ferromagnetic vortex. Finally, further experiments are discussed that would provide a more detailed understanding of the long range proximity effect in SFS junctions
Repopulating the Emptiness: A Spatial Critique of Ruination in Israel/Palestine
No full textThis article critically examines the notions of spatial emptiness and ruination through their unsettled appearance in the archive of colonization. Focusing on the history of Zionist colonization of Palestine/Eretz Israel, it illustrates how the encounter with the land fractures the ideological construct of emptiness and foregrounds the ambiguities found at the heart of the self-assured discourse of Zionism. Though there is an established corpus of scholarship that deconstructs the colonial fallacy of ‘the empty land’, the actuality and materiality of emptying processes and acts of ruination remains on the margins of this critical effort. Through a re-reading of key Zionist texts from different historical moments, the analysis sheds light on the contradictions and ambiguities that lie at the heart of the Zionist territorial project and the inherent weaknesses of the hegemonic production of space
Talking to Publishers about PDA: Interviews for E-BASS25
Get PDFPresentation given at the E-BASS25 End of Project Briefing on the interviews with publishers carried out by JISC Collections
Don’t mention Europe: a study of the Europeanisation of party organisation in the British Labour Party, the French Socialist Party and the German Social Democratic Party.
No full textThis thesis examines how the British Labour Party, the French Socialist Party (PS) and the German Social Democratic Party (SPD) have ‘Europeanised’ their organisations in three different arenas: (1) in the electorate and party system; (2) in central government and parliament; and (3) in their internal procedures and activities. ‘Europeanisation’ is defined as ‘a shorthand term for a complex process whereby national actors (in this case, parties) adapt to, and also seek to shape, the trajectory of European integration in general, and EU policies and processes in particular’ (Bomberg: 2002, 32). The underlying argument is that social democratic parties have to respond to challenges created by the European Single Market, which demands the reduction of state subsidies, and by the Economic and Monetary Union (EMU), which sets limits to public spending. Social democratic parties are expected to react to these challenges by Europeanising their organisations.
This thesis draws on the academic literature, party documents and contemporary newspaper articles, together with insights gained from 70 semi-structured interviews with EU experts at the European and national levels.
The central claim is that Labour, the PS and SPD have not become as Europeanised as might have been supposed for three ostensibly pro-European parties. Whilst successive party leaderships have paid lip service to the increasing importance of European integration, their party organisations have barely been involved in the formulation of European policy. The findings have serious implications for the three parties and domestic politics in Britain, France and Germany, since the memberships lack the enthusiasm and expertise to lead well-informed, critical, Europeanised debates and election campaigns
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