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Thursday, August 14 • 14:30 - 16:30
Quantum Information III

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Oral: Andrew Sachrajda
Three Spin Coherent Interference Behavior
Co-authors: Gabriel Poulin-Lamarre, Joelle Thorgrimson, Sergei Studenikin, Geof Aers, Alicia Kam, Piotr Zawadzki, Zbig Wasilewski

Invited: Dohun Kim
Quantum Control & Process Tomography of a Semiconductor Quantum Dot Hybrid Qubit
Co-authors: Zhan Shi, C. B. Simmons, D. R. Ward, Jon Prance, Teck Seng Koh, John King Gamble, Don E. Savage, M. G. Lagally, Mark Friesen, Susan N. Coppersmith, Mark A. Eriksson

We experimentally demonstrate quantum operations and tomographic characterization of a quantum dot hybrid qubit: a qubit based on three electrons in two dots formed in a Si/SiGe heterostructure that was proposed theoretically in [1]. Full qubit control on the Bloch sphere is performed using fast changes to only a single gate voltage used as the qubit control parameter [2]. X rotations are performed at the anticrossing between the (1,2) and (2,1) charge-like ground states, while Z rotations are performed through the use of phase accumulation between the ground state and an excited state with the same charge occupation. We measure a rotation rate of ~5 GHz (~11GHz) and a T2* of ~2ns (~10ns) for X (Z) rotations, both of which have visibility greater than 80%. Tomographic characterization of the hybrid qubit is performed through state and process tomography; measurements are performed in the Pauli basis and analyzed using maximum likelihood estimation. We show that the process fidelities for the X(π) and Z(π) gate operations are higher than 84% and 94%, respectively, demonstrating a promising combination of high speed, high fidelity, and efficient control in a semiconductor quantum dot qubit [3].

[1] Z. Shi et al., Phys. Rev. Lett. 108, 140503 (2012).
[2] Teck Seng Koh et al. Phys. Rev. Lett. 109, 250503 (2012).
[3] Dohun Kim et al. arXiv:1401.4416 (2014). 

Oral: Dmitrii Gets
N-VSi-Related Center in Non-Irradiated 6H SiC Nanostructure
Co-authors: Edward Danilovskii, Ekaterina Kalabukhova, Leonid Klyachkin, Anna Malyarenko, Daria Savchenko, Bela Shanina

Oral: M. Fernando Gonzalez-Zalba
An Exchanged-Coupled Donor Molecule in Silicon
Co-authors: Andre Saraiva, Maria J. Calderon, Dominik Heiss, Belita Koiller, Andrew J. Ferguson

Oral: Andreas Betz
Sensitive Gate-Based Charge Read-Out of Few-Electron Si Double Quantum Dots
Co-authors: Sylvain Barraud, Andrew Ferguson, Fernando Gonzalez-Zalba

Oral: Evgeny Chekhovich
Nuclear Spin-Echo Coherence in Strained InGaAs Quantum Dots: Quadrupolar Induced Suppression of Nuclear Spin Fluctuations 
Co-authors: Mark Hopkinson, Maurice Skolnick, Alexander Tartakovskii 

Session Chairs

Dohun Kim

Post Doctoral Research Associate, University of Wisconsin

Thursday August 14, 2014 14:30 - 16:30
Room 19B

Attendees (8)