65,084 research outputs found

    Finite-key security analysis for multilevel quantum key distribution

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    We present a detailed security analysis of a d-dimensional quantum key distribution protocol based on two and three mutually unbiased bases (MUBs) both in an asymptotic and finite key length scenario. The finite secret key rates are calculated as a function of the length of the sifted key by (i) generalizing the uncertainly relation-based insight from BB84 to any d-level 2-MUB QKD protocol and (ii) by adopting recent advances in the second-order asymptotics for finite block length quantum coding (for both d-level 2- and 3-MUB QKD protocols). Since the finite and asymptotic secret key rates increase with d and the number of MUBs (together with the tolerable threshold) such QKD schemes could in principle offer an important advantage over BB84. We discuss the possibility of an experimental realization of the 3-MUB QKD protocol with the orbital angular momentum degrees of freedom of photons.Comment: v4: close to the published versio

    From Normative Power to Great Power Politics: Change in the European Union's Foreign Policy Identity. Jean Monnet/Robert Schuman Paper Series. Vol. 5, No. 14 June 2008

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    [From the Introduction] At the beginning of the twenty-first century, one of the most significant developments in international relations is the important and growing role of the European Union (EU) as a global player in contemporary world politics. But what exactly is that role, how does the EU manage its relations with the external world and what identity does the EU wish to present to that world? In other words, what is the foreign policy identity of the EU? These are questions that analysts and scholars have grappled with since the formal creation of the EU at Maastricht in 1991 (Treaty on European Union). The EU has worked very carefully to foster a specific type of international identity. It is generally seen and theorized as a leader in the promotion of international peace and humanitarian issues. The EU presents itself as a normative force in world politics. It has customarily placed overriding emphasis on international law, democracy, human rights, international institutions, and multilateralism in its foreign policy, while eschewing a foreign policy based on traditional national interests and material gain. The EU has, in fact, explicitly and formally announced these normative goals for its foreign policymaking in the second pillar of the Treaty on European Union, more commonly known as the CFSP (Common Foreign and Security Policy). But in a world that has become markedly more perilous since September 11, 2001, many Europeans consider U.S. unilateralism as dangerous as the putative terrorist activity it is attempting to halt. As a result, are we seeing the foreign policy identity of the EU begin to change? Does the EU see itself as a possible balance against the primacy of the United States? In other words, does the EU show signs of transforming to a more traditional foreign policy orientation; one based on traditional great power politics and geared towards ensuring the most basic of state interests: survival, security and power? This paper will investigate this transforming foreign policy identity of the EU by seeking to answer the following questions: If the EU’s foreign policy identity is indeed changing, then how is it changing, what is it becoming, and most importantly, what is causing it to change? I will argue that the EU’s foreign policy identity is changing from a normative power to an identity based more closely on a great power politics model; and that the influence of epistemic communities or knowledge based networks is a primary catalyst for this change

    Do employees’ generational cohorts influence corporate venturing? A multilevel analysis

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    Organizations are facing an interesting phenomenon in the composition of theirworkforce: the concurrence of multiple age generations that demand suitablestrategies regarding work design, job satisfaction, and incentives. Ongoingentrepreneurship and strategic management debates require a betterunderstanding of the relationship between workplace generational cohorts’configurations and organizational performance. We propose a conceptual modelfor understanding how a diversified workforce influences some determinants(i.e., employees’ human capital and attitudes, organizational climate, andenvironmental conditions) of entrepreneurial organizations’ outcomes (i.e.,corporate venturing). Our framework offers insights into corporate venturingdeterminants for three generational cohorts: Baby Boomers, Generation X, andGeneration Y. Using a sample of 20,256 employees across 28 countries, ourfindings lend support to the positive effect of individual and organizationaldeterminants on corporate venturing, as well as how these effects are reinforcedper generational cohort. Specifically, our results show that younger generations(millennials) have more propensity to be involved in corporate venturingactivities. This study also contributes to thought-provoking implications forentrepreneurial organizational leaders who manage employees from differentgenerations
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