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Kenneth Brown Profile picture
@kenbrownquantum
Jun 1, 2020 • 7 tweets • 3 min read • Read on X
This week is also #DAMOP online.
aps.org/units/damop/me…

My students and postdocs are presenting work @DukeEngineering and collaborators @JQInews @EmoryChem @UCLA and @TempleUniv
Talks by session
D03.00002 Efficient Coherent Error Cancellation in Ion Trap Quantum Computers by Hidden Inverses
E01.00070 System Stability Optimization and Gate Operations in a Compact Cryogenic Ion Trap Setup
E01.00123 Towards sympathetic rotational cooling of CaH+ in a hybrid atom-ion trap
E01.00071 Characterizing the Coherence of Trapped Ion Qubits in the STAQ co-design hardware #SeeNSF
H06.00006 Demonstration of Shor encoding on a trapped-ion quantum computer #quantumerrorcorrection
K01.00168 Progress towards dipole-phonon quantum logic with trapped ions
S03.00003 Light assisted charge exchange interaction between potassium atoms and calcium ions in an ion-atom hybrid trap
T03.00004 Characterization of a Compact Cryogenic Package Approach to Ion Trapping

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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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