Single Wall Carbon Nanotube Weak Links

We have reproducibly contacted gated single wall carbon nanotubes (SWCNT) to superconducting leads based on niobium. The devices are identified to belong to two transparency regimes: The Coulomb blockade and the Kondo regime. Clear signature of the superconducting leads is observed in both regimes and in the Kondo regime a narrow zero bias peak interpreted as a proximity induced supercurrent persist in Coulomb blockade diamonds with Kondo resonances.Comment: Proceeding for International Symposium on Mesoscopic Superconductivity and Spintronics 2006, NTT BRL, Atsugi, Japa

Lessons learned from testing a prototype combining talent development and leadership innovation in a Scandinavian hospital setting

This paper addresses the potential clash between the “non-failure” culture of the hospital and the “fail-fast-forward” approach of innovation by sharing and analysing narratives from a field study of innovation processes. The case is a large university hospital in Scandinavia and the health care sector in general is outlined as context of the challenges addressed by the innovation processes. The narratives fall into three overlapping categories; the product, the process and the culture of innovation. Regarding the product of innovation, we outline the lessons learned about tensions created by ambitions of radical innovation in a public sector context, challenged by the idea of small-scale experiments and the participant’s feelings of inferiority. As for the process of innovation: we share the lessons learned about how linear and non-linear thinking affects the process of innovation. Addressing the culture of innovation, we discuss the lessons learned from working with a prototype testing approach in a system characterized by an evidence-based non-failure culture. Finally we summarize the lessons learned and share concluding perspectives

Orbital angular momentum states enabling fiber-based high-dimensional quantum communication

Quantum networks are the ultimate target in quantum communication, where many connected users can share information carried by quantum systems. The keystones of such structures are the reliable generation, transmission and manipulation of quantum states. Two-dimensional quantum states, qubits, are steadily adopted as information units. However, high-dimensional quantum states, qudits, constitute a richer resource for future quantum networks, exceeding the limitations imposed by the ubiquitous qubits. The generation and manipulation of such $D$-level systems have been improved over the last ten years, but their reliable transmission between remote locations remains the main challenge. Here, we show how a recent air-core fiber supporting orbital angular momentum (OAM) modes can be exploited to faithfully transmit $D$-dimensional states. Four OAM quantum states and their superpositions are created, propagated in a 1.2 km long fiber and detected with high fidelities. In addition, three quantum key distribution (QKD) protocols are implemented as concrete applications to assert the practicality of our results. This experiment enhances the distribution of high-dimensional quantum states, attesting the orbital angular momentum as vessel for the future quantum network

High-risk HPV is not associated with epithelial ovarian cancer in a Caucasian population

Dataset containing information on individual samples and PCR reactions. (XLSM 26 kb

Kondo-enhanced Andreev tunneling in InAs nanowire quantum dots

We report measurements of the nonlinear conductance of InAs nanowire quantum dots coupled to superconducting leads. We observe a clear alternation between odd and even occupation of the dot, with sub-gap-peaks at $|V_{sd}|=\Delta/e$ markedly stronger(weaker) than the quasiparticle tunneling peaks at $|V_{sd}|=2\Delta/e$ for odd(even) occupation. We attribute the enhanced $\Delta$-peak to an interplay between Kondo-correlations and Andreev tunneling in dots with an odd number of spins, and substantiate this interpretation by a poor man's scaling analysis

12 mode, WDM, MIMO-free orbital angular momentum transmission

Simultaneous MIMO-free transmission of 12 orbital angular momentum (OAM) modes over a 1.2 km air-core fiber is demonstrated. WDM compatibility of the system is shown by using 60, 25 GHz spaced WDM channels with 10 GBaud QPSK signals. System performance is evaluated by measuring bit error rates, which are found to be below the soft FEC limit, and limited by inter-modal crosstalk. The crosstalk in the system is analyzed, and it is concluded that it can be significantly reduced with an improved multiplexer and de-multiplexer