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Thursday, August 14 • 11:00 - 13:00
Quantum Information II

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Oral: Christopher Ford
Non-Adiabatic Excitation & Detection of Coherent Oscillations of Single Electrons
Co-author: Matthew Benesh

Oral: Liron Gantz
Coherent Control of Quantum Dot Spin & Novel Approach for Spin-Photon Entanglement
Co-authors: Ido Schwartz, Emma Schmidgall, Dan Cogan, Gad Bahir, David Gershoni

Oral: Shoji Baba
Cooper-Pair Splitting in a Nb-Based Parallel Double Quantum Dot Josephson Junction
Co-authors: Juergen Sailer, Russell Deacon, Akira Oiwa, Kenji Shibata, Kazuhiko Hirakawa, Seigo Tarucha

Oral: Junko Ishi-Hayase
Photon-Echo-Based Broadband Quantum Interface Using an Inhomogeneous Quantum Dot Ensemble
Co-authors: Kazumasa Suzuki, Shota Ichikawa, Kouichi Akahane

Invited: Preden Roulleau
Minimal-Excitation States for Electron Quantum Optics Using Levitons
Co-authors: Preden Roulleau, Matthieu Santin, Thibaut Jullien, Ian Farrer, David Ritchie, Yong Jin, Werner Wegscheider, D. Christian Glattli

The on-demand generation of pure quantum excitations is important for the operation of quantum systems, but it is particularly difficult for a system of fermions. This is because any perturbation affects all states below the Fermi energy, resulting in a complex superposition of particle and hole excitations. However, it was predicted nearly 20 years ago that a Lorentzian time-dependent potential with quantized flux generates a minimal excitation with only one particle and no hole. Here we report that such quasiparticles (called levitons) can be generated on demand in a conductor by applying voltage pulses to a contact [1]. Partitioning the excitations with an electronic beam splitter generates a current noise that we use to measure their number. Minimal-excitation states are observed for Lorentzian pulses, whereas for other pulse shapes there are significant contributions from holes. Further identification of levitons is provided in the energy domain with shot-noise spectroscopy, and in the time domain with electronic Hong-Ou-Mandel noise correlations.

[1] J. Dubois, T. Jullien, F. Portier, P. Roche, A. Cavanna, Y. Jin, W. Wegscheider, P. Roulleau and D. C. Glattli, Minimal-excitation states for electron quantum optics using levitons, Nature 502, 659-663 (2013).

Oral: Erika Kawakami
Electrical Control of a Long-Lived Spin Qubit in a Si/SiGe Quantum Dot
Co-authors: Pasquale Scarlino, Dan Ward, Floris Braakman, Mark Friesen, Don Savage, Max Lagally, Susan Coppersmith, Mark Eriksson, Lieven Vandersypen

Oral: Otto Rendon
Quantum Decoherence at Zero Temperature for Electron Scattering off Two Mobile-Impurities 
Co-authors: Enesto Medina

Session Chairs

Chungwei Lin

The University of Texas at Austin


Thursday August 14, 2014 11:00 - 13:00
Room 19B

Attendees (12)