Theory - Quantum Information

Robust FM 2-Qubit Gate For Ion Traps - Posted to ArXiv

We have developed a novel method for optimizing two-qubit gate in a trapped ion chain by frequency modulation. The method has been experimentally demonstrated in Chris Monroe's group at JQI and shown to have ~98% fidelity and robust against frequency errors over 1kHz in a 5-ion trap. The paper is now on the arXiv: 1708.08039

Bare [[7,1,3]] code paper posted to arXiv

In this paper we present a [[7,1,3]] quantum error-correcting code that is able to achieve fault-tolerant syndrome measurement using one ancillary qubit per stabilizer. Our results on this [[7,1,3]] code demonstrates how physically motivated noise models may simplify fault-tolerent protocols.
The paper can be found at arXiv:1702.01155.

Errors and pseudothresholds for incoherent and coherent noise published in Physical Review A


In this paper, we study the distinctive effects that incoherent and coherent errors have on an encoded qubit.  We use the effective 1-qubit process matrix at the logical level to understand the fundamental differences between these kinds of errors.  Congratulations to Mauricio, Conor, Livia, and Smitha!

Special Topics in Quantum Information - Spring 2016

I forgot my camera on the last day of class.
In addition to fundamentals of quantum computation, a large part of the class dealt with surface codes.  Final projects covered a wide range of topics from implementation of quantum computation on ion traps to quantum algorithms based on random walks.
Students were from the following majors: CHEM, CHBE, CS, CSE, ECE, and PHYS,
Special thanks to Colin Trout for serving as the unofficial TA.

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