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Your search keyword '"Stewart, Kevin A."' showing total 25 results
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3. Coupling a Surface Acoustic Wave to an Electron Spin in diamond via a Dark State

Author

Golter, D. Andrew, Oo, Thein, Amezcua, Mayra, Lekavicius, Ignas, Stewart, Kevin A., and Wang, Hailin

Subjects
Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The emerging field of quantum acoustics explores interactions between acoustic waves and artificial atoms and their applications in quantum information processing. In this experimental study, we demonstrate the coupling between a surface acoustic wave (SAW) and an electron spin in diamond by taking advantage of the strong strain coupling of the excited states of a nitrogen vacancy center, while avoiding the short lifetime of these states. The SAW-spin coupling takes place through a lamda-type three-level system where two ground spin states couple to a common excited state through a phonon-assisted as well as a direct dipole optical transition. Both coherent population trapping and optically-driven spin transitions have been realized. The coherent population trapping demonstrates the coupling between a SAW and an electron spin coherence through a dark state. The optically-driven spin transitions, which resemble the sideband transitions in a trapped ion system, can enable the quantum control of both spin and mechanical degrees of freedom and potentially a trapped-ion-like solid state system for applications in quantum computing. These results establish an experimental platform for spin-based quantum acoustic, bridging the gap between spintronics and quantum acoustics.

Published
2016
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4. Optomechanical Quantum Control of a Nitrogen Vacancy Center in Diamond

Author

Golter, D. Andrew, Oo, Thein, Amezcua, Mayra, Stewart, Kevin A., and Wang, Hailin

Subjects
Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We demonstrate optomechanical quantum control of the internal electronic states of a diamond nitrogen vacancy (NV) center in the resolved-sideband regime by coupling the NV to both optical fields and surface acoustic waves via a phonon-assisted optical transition and by taking advantage of the strong excited-state electron-phonon coupling of a NV center. Optomechanically-driven Rabi oscillations as well as quantum interferences between the optomechanical sideband and the direct dipole-optical transitions have been realized. These studies open the door to using resolved-sideband optomechanical coupling for quantum control of both the atom-like internal states and the motional states of a coupled NV-nanomechanical system, leading to the development of a solid-state analog of trapped ions.

Published
2016
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5. Restoration Hydro: A Watershed Approach to Standard Modular New Hydropower

Author

Schneider, Abe, primary, Penrod, Jessica, additional, Zhao, Jin, additional, Marzan, Tatiana, additional, Abbe, Tim, additional, Dickerson-Lange, Susan, additional, Nelson, Megan, additional, Chevalier, Brian, additional, Anderson, John, additional, DeNeale, Scott, additional, Stewart, Kevin, additional, Matson, Paul, additional, DeRolph, Chris, additional, Oladosu, Gbadebo, additional, George, Lindsay, additional, Wells, Jeremy, additional, Stein, Sam, additional, and Larsen, Laurel, additional

Published
2022
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9. Pumped Storage Hydropower Valuation Guidebook: A Cost-Benefit and Decision Analysis Valuation Framework

Author

Koritarov, Vladimir, primary, Balducci, Patrick, additional, Levin, Todd, additional, Christian, Mark, additional, Kwon, Jonghwan, additional, Milostan, Catharina, additional, Ploussard, Quentin, additional, Padhee, Malhar, additional, Tian, Yuting, additional, Mosier, Thomas, additional, Alam, S.M., additional, Bhattarai, Rojan, additional, Mohanpurkar, Manish, additional, Stark, Gregory, additional, Bain, Dominique, additional, Craig, Michael, additional, Hadjerioua, Boualem, additional, O’Connor, Patrick, additional, Mukherjee, Srijib, additional, Stewart, Kevin, additional, Ke, Xinda, additional, and Weimar, Mark, additional

Published
2021
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12. Pumped Storage Hydropower (PSH) FAST Commissioning Prize Technical Analysis

Author

Hadjerioua, Boualem, primary, Deneale, Scott, additional, Curd, Shelaine, additional, Greco, Tessa, additional, DeGeorge, Elise, additional, Veselka, Thomas, additional, Levin, Tod, additional, Saulsbury, Bo, additional, Stewart, Kevin, additional, Tingen, William, additional, Smith, Brennan, additional, Stark, Greg, additional, Koritarov, Vladimir, additional, Bottenud, Audum, additional, Christian, Mark, additional, and Colotelo, Alison, additional

Published
2020
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13. Pumped Storage Hydropower FAST Commissioning Technical Analysis

Author

Hadjerioua, Boualem, primary, Stewart, Kevin, additional, DeNeale, Scott, additional, Tingen, William, additional, Curd, Shelaine, additional, Smith, Brennan, additional, Greco, Tessa, additional, Stark, Greg, additional, Degeorge, Elise, additional, Koritarov, V., additional, Veselka, Thomas, additional, Botterud, Audun, additional, Levin, Todd, additional, Christian, Mark, additional, Saulsbury, James, additional, and Colotelo, Alison, additional

Published
2020
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16. Simulation and Modeling Capability for Standard Modular Hydropower Technology

Author

Stewart, Kevin M., primary, Smith, Brennan T., additional, Witt, Adam M., additional, DeNeale, Scott T., additional, Bevelhimer, Mark S., additional, Pries, Jason L., additional, Burress, Timothy A., additional, Kao, Shih-Chieh, additional, Mobley, Miles H., additional, Lee, Kyutae, additional, Curd, Shelaine L., additional, Tsakiris, Achilleas, additional, Mooneyham, Christian, additional, Papanicolaou, Thanos, additional, Ekici, Kivanc, additional, Whisenant, Matthew J., additional, Welch, Tim, additional, and Rabon, Daniel, additional

Published
2017
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18. A Multi-Year Plan for Research, Development, and Prototype Testing of Standard Modular Hydropower Technology

Author

Smith, Brennan T., primary, Welch, Tim, additional, Witt, Adam M., additional, Stewart, Kevin M., additional, Lee, Kyutae, additional, DeNeale, Scott T., additional, Bevelhimer, Mark S., additional, Burress, Timothy A., additional, Pracheil, Brenda M., additional, Pries, Jason L., additional, O'Connor, Patrick W., additional, Curd, Shelaine L., additional, Ekici, Kivanc, additional, Papanicolaou, Thanos, additional, Tsakiris, Achilleas, additional, Kutz, Benjamin, additional, Bishop, Norm, additional, McKeown, Alisha, additional, Rabon, Daniel, additional, Zimmerman, Gregory P., additional, Uria Martinez, Rocio, additional, and McManamay, Ryan A., additional

Published
2017
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19. Exemplary Design Envelope Specification for Standard Modular Hydropower Technology

Author

Witt, Adam M., primary, Smith, Brennan T., additional, Tsakiris, Achilleas, additional, Papanicolaou, Thanos, additional, Pries, Jason L., additional, Burress, Timothy A., additional, Stewart, Kevin M., additional, Lee, Kyutae, additional, DeNeale, Scott T., additional, Bevelhimer, Mark S., additional, Pracheil, Brenda M., additional, McManamay, Ryan A., additional, Ekici, Kivanc, additional, Kutz, Benjamin, additional, Curd, Shelaine L., additional, Bishop, Norm, additional, Welch, Tim, additional, Rabon, Daniel, additional, and Fernandez, Alisha, additional

Published
2017
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23. Energy Zones Study: A Comprehensive Web-Based Mapping Tool to Identify and Analyze Clean Energy Zones in the Eastern Interconnection

Author

Koritarov, Vladimir, primary, Kuiper, James, additional, Hlava, Kevin, additional, Orr, Andrew, additional, Rollins, Katherine, additional, Brunner, Donna, additional, Green, Jr., Herman, additional, Makar, Jeffrey, additional, Ayers, Andrew, additional, Holm, Michael, additional, Simunich, Kathy, additional, Wang, Jianhui, additional, McLamore, Michael, additional, Shamsuddin, Shabbir, additional, Kavicky, James, additional, Portante, Edgar, additional, Conzelmann, Guenter, additional, Molburg, John, additional, Clark, Corrie, additional, Snyder, Seth, additional, Darling, Seth, additional, Braun, Joseph, additional, Botterud, Audun, additional, Gasper, John, additional, Richmond, Pamela, additional, Beardsley, Brett, additional, Schlueter, Scott, additional, Augustine, Chad, additional, Heimiller, Donna, additional, Hurlbut, David J., additional, Milbrandt, Anelia, additional, Schneider, Thomas R., additional, Hadley, Stanton W., additional, Gracia, Jose R., additional, Mays, Gary T., additional, Belles, Randy, additional, Omitaomu, Olufemi A., additional, Fernandez, Steven, additional, Hadjerioua, Boualem, additional, Stewart, Kevin M., additional, Kodysh, Jeffrey, additional, and Smith, Travis, additional

Published
2013
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25. The Integrated Basin-Scale Opportunity Assessment Initiative, FY 2011 Year-End Report: Deschutes Basin Preliminary Hydropower Opportunity Assessment Draft Report

Author

Geerlofs, Simon, primary, Voisin, Nathalie, additional, Ham, Kenneth, additional, Tagestad, Jerry, additional, Hanrahan, Timothy, additional, Coleman, Andre, additional, Saulsbury, James, additional, Wolfe, Amy, additional, Hadjerioua, Boualem, additional, and Stewart, Kevin, additional

Published
2011
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