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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

"Quantum error-correction failure distributions: Comparison of coherent and stochastic error models" published in Phys Rev A

 

With collaborators at the Johns Hopkins Applied Physics Laboratory, we studied the output failure distributions of quantum error correcting codes under the influence of of coherent and incoherent error sources. The paper can be found here.

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!

Rene Rugango defends PhD thesis


Rene successfully defends his thesis Spectroscopy of molecular ions in Coulomb crystals.  Congratulations Rene!
 
Rene's thesis builds off his three publications listed below:
 
Trapping and sympathetic cooling of Boron ions, R. Rugango, M. Sinhal, G. Shu, and K. R. Brown, arXiv:1609.09521 (2016)

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