Friday, March 16, 2018
12:00 pm

IQIM Postdoctoral and Graduate Student Seminar

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.

 

 

Contact Marcia Brown marciab@caltech.edu at 626-395-4013
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