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IQIM Postdoctoral and Graduate Student Seminar

Friday, March 16, 2018
12:00pm to 1:00pm
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East Bridge 201 (Richard P. Feynman Lecture Hall)
Isotopically Enhanced Triple-Dot Qubits in SiGe
Thaddeus Ladd, senior research scientist, HRL Laboratories, LLC,

Abstract: Qubits based on silicon offer the promise of low magnetic noise due to isotopic enhancement and the availability of existing silicon growth and fabrication processes.  Triple-dot qubits offer promise of exchange-only spin-qubit control, enabling operation using only gate voltages.  The main impediments to silicon qubits are interface disorder, charge noise, valley degeneracy, and nuclear magnetism.  In this talk, I will summarize recent data characterizing these impediments for SiGe triple dots fabricated in an undoped accumulation-mode gate architecture, including symmetric barrier control to mitigate charge noise, and isotopic enhancement to mitigate nuclear noise.  I will then discuss the mathematics of pulse sequences allowing gauge-independent quantum logic, enabling future developments for exchange-only multiqubit quantum processors.

Updated location for this week's talk: Talk will begin at 12 noon in 201 E. Bridge. Lunch will be available following the talk in 114 E. Bridge.



For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at [email protected].