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You searched on: Topic Area: Quantum Physics

Displaying records 11 to 20 of 26 records.
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11. Bell violation using entangled photons without the fair-sampling assumption
Topic: Quantum Physics
Published: 4/14/2013
Authors: Marissa Giustina, Alexandra Mech, Sven Ramelow, Bernhard Wittman, Johannes Keffler, Joern Beyer, Adriana Eleni Lita, Thomas Gerrits, Sae Woo Nam, Rupert Ursin, Anton Zeilinger, Brice R. Calkins
Abstract: The violation of a Bell inequality is an experimental observation that forces the abandonment of a local realistic viewpoint - namely, one in which physical properties are (probabilistically) defined before and independently of measurement, and in ...

12. Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination
Topic: Quantum Physics
Published: 1/6/2013
Authors: Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L Migdall
Abstract: The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical limits is of both technological and fundamental interest. Quantum noise prevents any mutually nonorthogonal quantum states ...

13. Preface to Proceedings of the International Conference Quantum Theory: Reconsideration of Foundations-6 (QTRF6) held in Vaxjo, Sweden, 11-14 June 2012
Topic: Quantum Physics
Published: 12/18/2012
Authors: Harald Atmanspacher, Andrei Khrennikov, Alan L Migdall, Sergey V Polyakov
Abstract: A wide spectrum of topics was presented in talks at this conference: quantum foundations (especially, Heisenberg's uncertainty relation and its generalizations) and information, mathematical formalism of quantum theory, philosophy, methodology of m ...

14. Quantum interface between an electrical circuit and a single atom
Topic: Quantum Physics
Published: 3/30/2012
Authors: Jacob M Taylor, Dvir Kafri, David Kielpinski, G J Milburn, M J Woolley
Abstract: Atomic systems are remarkably well suited to storage and processing of quantum information. However, their properties are tightly constrained by physical law, causing difficulties in interfacing to optical or electronic devices. On the other hand, q ...

15. Electron Vortex Beams with High Quanta of Orbital Angular Momentum
Topic: Quantum Physics
Published: 1/14/2011
Authors: Benjamin James McMorran, Amit Kumar Agrawal, Ian M. Anderson, Andrew A Herzing, Henri J Lezec, Jabez J McClelland, John Unguris
Abstract: Analogous to vortices in light optical beams, electron optical beams with helical wavefronts carry orbital angular momentum and promise new capabilities for electron microscopy and other applications. We use nanofabricated diffraction holograms in an ...

16. Preserving quantum coherence using optimized open-loop control techniques
Topic: Quantum Physics
Published: 5/16/2010
Authors: Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M Itano, John J Bollinger
Abstract: We describe experimental and theoretical studies of open-loop quantum control techniques known as dynamical decoupling (DD) for the suppression of decoherence-induced errors in quantum systems. Our experiments on trapped atomic ion qubits demonstra ...

17. Mode Expansion and Bragg Filtering Enable a High-Fidelity Fiber-Based Photon-Pair Source
Topic: Quantum Physics
Published: 11/9/2009
Authors: Alexander E. Ling, Jun Chen, Jingyun Fan, Alan L Migdall
Abstract: We report the development of a fiber-based single spatial mode source of photon-pairs where the efficiency of extracting photon-pairs is 15x better than a previous implementation [16]. This critical improvement in efficiency enabled a spectrally bri ...

18. Electromagnetically induced transparency in a superconducting three-level system
Topic: Quantum Physics
Published: 4/16/2009
Authors: Mika Sillanpaa, Katarina Cicak, Fabio Altomare, Jae Park, Raymond Wiley Simmonds, Jian Li, G. S. Paraoanu, Pertti Hakonen
Abstract: When a three-level quantum system is irradiated by an intense coupling field resonant with two of the three possible transitions, the resonant absorption of the system from its ground state by an additional radiation field is suppressed. This effec ...

19. Improved implementation of the Alicki Van Ryn nonclassicality test for a single particle using Si detectors
Topic: Quantum Physics
Published: 4/15/2009
Authors: Sergey V Polyakov, Alan L Migdall, Giorgio Brida, Ivo Pietro Degiovanni, Marco Genovese, Fabrizio Piacentini, V Schettini, Nicolas Gisin
Abstract: Recently a test of nonclassicality for a single qubit was proposed R. Alicki and N. Van Ryn, J. Phys, A: Math. Theor. 41, 062001 2008. We present an optimized experimental realization of this test leading to a 46standard deviation violation of cl ...

20. Improved multiplexed Infrared Single Photon Detectors
Topic: Quantum Physics
Published: 8/11/2008
Authors: Sergey V Polyakov, Alan L Migdall, V Schettini, Ivo Pietro Degiovanni, Giorgio Brida, F Piacentini
Abstract: We discuss a scheme for a photon-counting detection system that overcomes the difficulties of photon-counting at high rates at telecom wavelengths. Our method uses an array of N detectors and a 1-by-N optical switch with a control circuit to direct i ...

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