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Displaying records 31 to 40 of 45 records.
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31. Photon Temporal Correlations Measured Using a Dual-Channel Upconversion Detector
Topic: Quantum Information
Published: 10/14/2012
Authors: Paulina S Kuo, Jason S. Pelc, Oliver T Slattery, Martin M. Fejer, Xiao Tang
Abstract: We demonstrate application of a dual-channel upconversion detector as a beamsplitter that preserves photon statistics. We use this beamsplitter to characterize temporal correlations of photons from coherent and pseudo-thermal sources.

32. Photonic Technologies for Quantum Information Processing
Topic: Quantum Information
Published: 10/2/2004
Authors: Prem Kumar, P G Kwiat, Alan L Migdall, Sae Woo Nam, Jelena Vuckovic, F Wong
Abstract: The last several years have seen tremendous research toward practical optical quantum information processing, including single- and entangled-photon sources and high-efficiency photon counting detectors, covering a range of wavelengths. We review som ...

33. Preparation of Dicke States in an Ion Chain
Topic: Quantum Information
Published: 11/2/2009
Authors: David Hume, Chin W. Chou, Till P Rosenband, David J Wineland
Abstract: We have investigated theoretically and experimentally a method for preparing Dicke states in trapped atomic ions. We consider a linear chain of N ion qubits that is prepared in a particular Fock state of motion, jmi. The m phonons are removed by ap ...

34. Quantum Tomography via Compressed Sensing: Error Bounds, Sample Complexity, and Efficient Estimators
Topic: Quantum Information
Published: 9/27/2012
Authors: Yi-Kai Liu, Steven T. Flammia, David Gross, Jens Eisert
Abstract: Intuitively, if a density operator has small rank, then it should be easier to estimate from experimental data, since in this case only a few eigenvectors need to be learned. We prove two complementary results that confi rm this intuition. First, ...

35. Quantum Transduction of Telecommunications-band Single Photons from a Quantum Dot by Frequency Upconversion
Topic: Quantum Information
Published: 10/3/2010
Authors: Matthew T. Rakher, Lijun Ma, Oliver T Slattery, Xiao Tang, Kartik A Srinivasan

36. Quantum information processing and metrology with trapped ions
Topic: Quantum Information
Published: 1/25/2011
Authors: David J Wineland, Dietrich G Leibfried
Abstract: The use of trapped atomic ions in the field of quantum information processing is briefly reviewed. We summarize the basic mechanisms required for logic gates and the use of the gates in demonstrating simple algorithms. We discuss the potential of tra ...

37. Quantum information processing and quantum control with trapped atomic ions
Topic: Quantum Information
Published: 12/14/2009
Author: David J Wineland
Abstract: The role of trapped atomic ions in the field of quantum information processing is briefly reviewed. We discuss some of the historical developments that enabled ions to enter the field and then summarize the basic mechanisms required for logic gates a ...

38. Quantum state tomography of a fiber-based source of polarization-entangled photon pairs
Topic: Quantum Information
Published: 12/20/2007
Authors: Jingyun Fan, M D. Eisaman, Alan L Migdall
Abstract: We report an experimental demonstration of a bright highfidelity single-mode-optical-fiber source of polarization-entangled photon pairs. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phas ...

39. Realization of a programmable two-qubit quantum processor
Topic: Quantum Information
Published: 11/15/2009
Authors: David Hanneke, Jonathan Home, John D. Jost, Jason Amini, Dietrich G Leibfried, David J Wineland
Abstract: The universal quantum computer is a device that could simulate any physical system and represents a major goal for the field of quantum information science. Algorithms performed on such a device are predicted to offer significant gains for some impor ...

40. Reduced Deadtime and Higher Rate Photon-Counting Detection Using a Multiplexed Detector Array
Topic: Quantum Information
Published: 1/20/2007
Authors: Stefania Castelletto, Ivo Pietro Degiovanni, V Schettini, Alan L Migdall
Abstract: We present a scheme for a photon-counting detection system that can be operated at incident photon rates higher than otherwise possible by suppressing the effects of detector deadtime. The method uses an array of N detectors and a 1-by-N optical swit ...

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