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Topic Area: Quantum Information
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Displaying records 1 to 10 of 46 records.
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1. Entangled photon generation in a phase-modulated, quasi-phasematched crystal
Topic: Quantum Information
Published: 10/14/2013
Authors: Paulina S Kuo, Jason S. Pelc, Oliver T Slattery, Yong-Su Kim, Xiao Tang
Abstract: We propose a scheme to generate polarization-entangled photon pairs by spontaneous parametric downconversion in a phase-modulated, type-II, quasi-phasematched (QPM) crystal. Instead of using two distinct crystals to generate |HV>and |VH> stat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914712

2. Efficient, low-noise, single-photon frequency conversion
Topic: Quantum Information
Published: 6/9/2013
Authors: Paulina S Kuo, Jason S. Pelc, Oliver T Slattery, Yong-Su Kim, M. M. Fejer, Xiao Tang
Abstract: We demonstrate simultaneous low-noise and efficient frequency conversion in a periodically poled LiNbO3 waveguide with spectral filtering. We achieve >50% external conversion efficiency and 600 noise counts per second at peak conversion.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913243

3. Demonstrating a High Symmetric Single-Photon Heralding Efficiency in Spontaneous Parametric Downconversion
Topic: Quantum Information
Published: 5/6/2013
Authors: Marcelo Pereira, Francisco Elohim Becerra Chavez, Boris L. Glebov, Jingyun Fan, Sae Woo Nam, Alan L Migdall
Abstract: We demonstrate a symmetric, single-spatial mode, single-photon heralding efficiency of 84% for a type-II spontaneous parametric downconversion process. This achievement of high efficiency, single-spatial mode collection is key to enabling many quantu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913209

4. Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination
Topic: Quantum Information
Published: 1/6/2013
Authors: Francisco Elohim 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912063

5. 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.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911446

6. 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, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911441

7. Gradient-based stopping rules for maximum-likelihood quantum-state tomography
Topic: Quantum Information
Published: 9/18/2012
Authors: Scott C Glancy, Emanuel H Knill, Mark Girard
Abstract: When performing maximum likelihood quantum state tomography, one must find the quantum state that maximizes the likelihood for observed measurements on identically prepared systems, all having that quantum state. This optimization is usually perform ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911222

8. M-ary state phase-shift keying discrimination below the homodyne limit
Topic: Quantum Information
Published: 12/22/2011
Authors: Francisco Elohim Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Sergey V Polyakov, Julius Goldhar, Jonathan Kosloski, Alan L Migdall
Abstract: We investigate a strategy for M-ary discrimination of nonorthogonal phase states with error rates below the homodyne limit. This strategy uses feed forward to update a reference field and Signal nulling for the state discriminati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908874

9. Multi-Spatial-Mode Single-Beam Quadrature Squeezed States of Light from Four-Wave Mixing in Hot Rubidium Vapor
Topic: Quantum Information
Published: 10/24/2011
Authors: Neil V. (Neil Vladimir) Corzo Trejo, Alberto Manuel Marino, Kevin M. Jones, Paul D Lett
Abstract: We present experimental results on the generation of multi-spatial-mode, single-beam, quadrature squeezed light using four-wave mixing in hot Rb vapor. Squeezing and phase-sensitive deamplification are observed over a range of powers and detunings ne ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909323

10. State Discriminiation Signal Nulling Receivers
Topic: Quantum Information
Published: 9/6/2011
Authors: Francisco Elohim Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Sergey V Polyakov, Julius Goldhar, Jonathan Kosloski, Alan L Migdall
Abstract: Optimized state-discrimination receiver strategies for nonorthogonal states can improve the capacity of the communication channels operating with error rates below the ones corresponding to conventional receivers. Coherent signal-nulling receivers us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909465



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