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Kenneth Brown Profile picture
@kenbrownquantum
Apr 18, 2019 • 7 tweets • 3 min read • Read on X
In 2010, I was part of a Phase 1 @NSF Chemical Center for Innovation based out of @PurdueChemistry and led by Sabre Kais.
The team was Sabre, Daniel Lidar, Peter Love, and @A_Aspuru_Guzik .
It also included @JarrodMcclean @faherreraur @caoyudong @JDWhitfield11 and many more without Twitter accounts.
Today when I returned to Purdue seven years after the program ended, its impact was more clear. The students that it trained have gone into do amazing things in quantum computing and outside of it.
My PhD student Muyuan Like first joined me as an undergrad summer student funded by this project.
Lately, he has been exploring quantum error correction (e.g. see arXiv:1804.01127 ), writing an ion trap module for Google #cirq, and preparing for an internship at #IBMQ.
Our proposal for Phase 2 was rejected but the seeds were already planted, and the science continues to be harvested.

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More from @kenbrownquantum

Kenneth Brown Profile picture
Sep 25, 2020
The @bacon-@PeterShor1 code project has been a great collaboration with Chris Monroe's group @JQInews and my group @DukeEngineering @DukePhysics @GTCSE. It is an amazing experiment with excellent control over 13 ions in a chain of 15 ions. Here is a thread about the theory. 1/n
The first error correction code is a concatenation of two repetition codes by @PeterShor1 in 1995
journals.aps.org/pra/abstract/1… 2/n
In 2005, @dabacon (typo in 1/n whoops) was looking for a stable quantum memory and posted a subsystem version of Shor's code arxiv.org/abs/quant-ph/0…. Immediately David Poulin released a paper showing how it connected to the stabilizer formalism arxiv.org/abs/quant-ph/0… 3/n
Read 19 tweets
Kenneth Brown Profile picture
Aug 5, 2020
I agree with @abe_asfaw and @crazy4pi314 that the Bloch sphere doesn't help that much understanding larger quantum systems. However, there is an interesting set of counter examples.
The Bloch sphere needs two non-commuting Pauli matrices. Any two. They could be k-qubit Pauli matrices.
This was used by @nmrqip to show how to use single-qubit composite pulses to make two-qubit gates robust to systematic error.
arxiv.org/abs/quant-ph/0…
Read 8 tweets
Kenneth Brown Profile picture
Aug 2, 2020
Our paper on weighted union-find decoding on the toric code is now out in @PhysRevA journals.aps.org/pra/abstract/1…
@Huang_Shilin first developed the weighted union-find decoder to look at the whole family of compass codes but using a slightly non-standard error model. arxiv.org/abs/1911.11317
In this paper (arxiv vesrsion her arxiv.org/abs/2004.04693), Mike and Shilin use the standard error model and find that even truncated weights give great performance.
Read 4 tweets
Kenneth Brown Profile picture
Jul 8, 2020
Congratulations to Pak Hong (James) Leung for successfully defending his PhD on "Robust Ion Trap Quantum Computation Enabled by Quantum Control." @DukePhysics @DukeTrinity #DukeQuantum Image
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
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
Read 4 tweets
Kenneth Brown Profile picture
Jun 25, 2020
The #SummerSTAQ 2020 lecture notes, recorded lectures, problem sets, and discussion sections are now all available openly here. Enjoy and think about joining as a student or lecturer for #SummerSTAQ 2021.
staq.pratt.duke.edu/summer-school
Let me again thank this years lecturers: @quantum_aram (@MIT), Akimasa Miyake (@UNM), Peter Love (@TuftsUniversity), Chris Monroe (@JQInews, @IonQ_Inc ), Abhinav Kandala and David McKay (@IBMResearch, #IBMQ), and Casey Duckering @prof_chong (@EPiQCExpedition @UChicago )
I'd also like to thank the students for joining us for this virtual school.
Read 5 tweets
Kenneth Brown Profile picture
Jun 6, 2020
I am really sorry to hear this but in the spirit of Jon Dowling, I will retell my two favorite slightly irreverent Dowling stories.
When I was a grad student QC funding was the wild west because nothing worked and the government was trying to see if anything worked. This ended in a strange way where some program calls were made and then mysteriously canceled right around when I became a postdoc 2003-4
I think of this as "the first quantum winter" and was bad for QC grad students trying to become faculty in the US. Anyway, the next time there was a call for proposals everyone ignored the last weird time but Jon.
Read 7 tweets

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