Discover and read the best of Twitter Threads about #DukeQuantum
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Congratulations to Pak Hong (James) Leung for successfully defending his PhD on "Robust Ion Trap Quantum Computation Enabled by Quantum Control." @DukePhysics @DukeTrinity #DukeQuantum 
James had a great collaboration with @kalandsman9 @JQInews where James would invent pulses for two-qubit gates and Kevin would show that they worked in practice.
arxiv.org/abs/1708.08039
arxiv.org/abs/1808.02555
arxiv.org/abs/1905.10421
arxiv.org/abs/1708.08039
arxiv.org/abs/1808.02555
arxiv.org/abs/1905.10421
James worked with an undergraduate Catherine Liang (co-founder duqis.org) and grad students @Huang_Shilin, and Bichen Zhang to optimize digitial implementations leading to great gates @DukeEngineering arxiv.org/abs/2003.12430
Today the lab had a virtual sendoff for Muyuan Li (PhD 2020, @GTCSE 🔜 @IBM #IBMQ), Natalie Brown (PhD 2020, @GTPhysics🔜@honeywell), and Mike Newman (Postdoc @DukeEngineering🔜 @GoogleAI). Here is a picture of everyone @QIP2020. #DukeQuantum
Since we couldn't get together in person, we played a virtual escape room together. It was like real life where someone would have the right idea early and everyone would ignore them.
I am going to miss this crew of quantum error correction experts and I wish them the best of luck in their future endeavors.
A thread on the Cirac-Zoller gate: why it is important and why it is never used. (1/n)
In 1995, ions were clearly a good choice for a qubit. The internal states were known to be very coherent and are still used to this day to build incredibly precise atomic clocks (2/n).
The problem is how to couple the internal states of the ions together to do conditional logic. In an ion trap, ions stay microns apart due to the Coulomb repulsion and at that distance the coupling between internal states is very weak. (3/n)
Happy to join in celebrating #NSF70 with my #NSFstories.
As an undergraduate @univpugetsound at a small liberal arts college, I was unsure what graduate school would be like. Thanks to the @NSF REU at the @UMNews, I was able to join @VPRCramer's lab for the summer and see what grad school life was like at a research university. #SeeNSF
This summer led to my first paper with my grad student mentor @mbsullivan .
pubs.acs.org/doi/full/10.10… #NSFstories
pubs.acs.org/doi/full/10.10… #NSFstories
New paper on a weighted Union-Find decoder for the toric code with @Huang_Shilin and Mike Newman (arxiv.org/abs/2004.04693). #DukeQuantum @DukeEngineering
A weighted Union-Find decoder increases the threshold for the Union-Find decoder but at what cost? In previous work with @Huang_Shilin (arxiv.org/abs/1911.11317) on 2D compass codes, we predicted it should be quadratically slower.
In this paper, we show that with truncated weights that the speed is comparable to unweighted Union-Find with negligible loss in performance.
New paper on QCCD ion trap architectures for near-term devices (arxiv.org/abs/2004.04706).
A great collaboration with Prakash Murali (@MartonosiGroup) , @margmartonosi, & @DriptoDebroy (@DukePhysics). Paper accepted at @ISCAConfOrg. #DukeQuantum @DukeEngineering @Princeton
A great collaboration with Prakash Murali (@MartonosiGroup) , @margmartonosi, & @DriptoDebroy (@DukePhysics). Paper accepted at @ISCAConfOrg. #DukeQuantum @DukeEngineering @Princeton
In the ion trap community there is a bit of a divide between what is the right size of an ion chain. On the one hand, small ion chains have been shown to have incredible fidelities. On the other hand, long ion chains allow you to grow Hilbert space more easily.
There are two main camps: (1) shuttling with 2-4 ion chains is the best and (2) the longest chain that works is the best. Here we study what is the best ion chain length in an architecture that has long chains and shuttling. It turns out to depend on the application.
Congratulations to Dr. Muyuan for a great thesis defense today on Fault-Tolerance on Near-Term QuantumComputers and Subsystem Quantum Error Correcting Codes. Here he is defending his 2017 paper on how physical errors simplify fault tolerant circuits arxiv.org/abs/1702.01155 .
Thanks to the committee
@RichVuduc, Edmund Chow, @cd_sherrill
and Brian Kennedy. Muyuan's work was done
@GTCSE @GT_CHEM @DukeEngineering @ChesterfieldNC
and @IBMResearch #IBMQ #DukeQuantum
@RichVuduc, Edmund Chow, @cd_sherrill
and Brian Kennedy. Muyuan's work was done
@GTCSE @GT_CHEM @DukeEngineering @ChesterfieldNC
and @IBMResearch #IBMQ #DukeQuantum
I am missing the immediate post thesis celebration but it was great to have Muyuan's collaborators from @UniversidadCR , @IQ_USherbrooke , and @HHU_de be able to join the defense.
Natalie Brown (@GTPhys), Andrew Cross (#IBMQ), and I posted a new paper on leakage errors in the surface code to the arXiv today. arxiv.org/abs/2003.05843 @DukeEngineering #DukeQuantum
Natalie recently defended her thesis on leakage errors. First, she compared whether it was better to have a magnetic field sensitive qubit or a leaky qubit using the standard depolarizing error model for the leaky qubit interaction. arxiv.org/abs/1803.02545
Then Natalie, Mike Newman ,and I realized the physical model of how leaked states and qubit states interact for trapped ion gates is nicer than the standard depolarizing error model. arxiv.org/abs/1903.03937 arxiv.org/abs/1904.10724
