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Topic Area: Quantum Information
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Displaying records 21 to 30 of 47 records.
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21. Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
Topic: Quantum Information
Published: 2/17/2010
Authors: Chin W. Chou, David Hume, J.C. Koelemeij, David J Wineland, Till P Rosenband
Abstract: We have constructed an optical clock with a fractional frequency inaccuracy of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser-cool the Al+ ion and detect its quantum state. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904590

22. Heralded, pure-state single-photon source based on a Potassium Titanyl Phosphate waveguide
Topic: Quantum Information
Published: 2/15/2010
Authors: Zachary H Levine, Jingyun Fan, Jun Chen, Alexander E. Ling, Alan L Migdall
Abstract: WWe analyze the generation of single spatial mode, spectrally uncorrelated photon pairs via type II spontaneous parametric downconversion in a Potassium Titanyl Phosphate (KTP) waveguide using real experimental parameters. We show that this source ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904223

23. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903175

24. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903420

25. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903578

26. Microstructure fiber-based source of photonic entanglement
Topic: Quantum Information
Published: 11/1/2009
Authors: Jingyun Fan, Alan L Migdall, Jun Chen, Elizabeth A Goldschmidt, Alexander E. Ling
Abstract: We review the development of photonic entanglement via four-wave mixing in microstructure fiber
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902840

27. Innovations in Maximum Likelihood Quantum State Tomography
Topic: Quantum Information
Published: 10/9/2009
Authors: Scott C Glancy, Emanuel H Knill, Thomas Gerrits, Tracy S. Clement, Brice R. Calkins, Adriana Eleni Lita, Aaron J Miller, Alan L Migdall, Sae Woo Nam, Richard P Mirin
Abstract: At NIST we are engaged in an experiment whose goal is to create superpositions of optical coherent states (such superpositions are sometimes called "Schroedinger cat" states). We use homodyne detection to measure the light, and we apply ma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904007

28. Ultra-cold mechanical resonators coupled to atoms in an optical lattice
Topic: Quantum Information
Published: 9/17/2009
Authors: Andrew Geraci, John E Kitching
Abstract: We propose an experiment utilizing an array of cooled micro-cantilevers coupled to a sample of ultra-cold atoms trapped near a micro-fabricated surface. The cantilevers allow individual lattice site addressing for atomic state control and readout, an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903004

29. Energy Decay in Josephson Qubits from Non-equilibrium Quasiparticles
Topic: Quantum Information
Published: 8/26/2009
Authors: Jose Alberto Aumentado, John M Martinis, M Ansmann
Abstract: We calculate the energy decay rate of Josephson qubits and superconducting resonators from non-equilibrium quasiparticles. The decay rates from experiments are shown to be consistent with our predictions based on a prior measurement of the quasipar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902421

30. Waveguide source of correlated photon pairs for chip-scale quantum information processing
Topic: Quantum Information
Published: 8/26/2009
Authors: Jun Chen, Aaron Pearlman, Alexander E. Ling, Jingyun Fan, Alan L Migdall
Abstract: We present a systematic study of a correlated photon-pair source based on a periodically-poled KTiOPO4 (PPKTP) waveguide. The waveguide was fabricated on a KTiOPO4 crystal supporting type-II parametric down-conversion. In addition, periodic poling ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903158



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