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Kenneth Brown Profile picture
@kenbrownquantum
Dec 30, 2019 • 6 tweets • 7 min read • Read on X
We are one week away from @QIP2020 and I am excited to hear more about cutting-edge quantum information processing. This year @DukeEngineering is well represented with 1 plenary talk, 2 contributed talks, and 5 posters #qip2020 #QuantumDuke.
@QIP2020 @DukeEngineering Daily Guide to @DukeEngineering presentations @QIP2020

Monday:
Poster 118 -N. Brown, M. Newman and KRB
Conditions for fault tolerance in the presence of leakage
@QIP2020 @DukeEngineering Tuesday:
Talk: 14:25 @nrenga92 , R. Calderbank, M. Newman and H. Pfister. On Optimality of CSS Codes for Transversal T

Posters: 247, 248, 289, 326
247 @DriptoDebroy , M. Li, @SeeLamWong and KRB 9 Qubit Compass Codes Under Realistic Ion-Trap Noise
@QIP2020 @DukeEngineering @nrenga92 @DriptoDebroy @SeeLamWong 248M. Li (@GTCSE ) and T. Yoder (#IBMQ)Decoding Subsystem Codes Defined with Classical Expander Codes

289@nrenga92 , K. Seshadreesan, S. Guha and H. PfisterBelief-Propagation with Quantum Messages on Pure-State Channels

326@SeeLamWong and KRB, FTQEC for 2D Compass Codes
@QIP2020 @DukeEngineering @nrenga92 @DriptoDebroy @SeeLamWong @GTCSE Wednesday:
9:00 KRB, The Fault is in Our Qubits: FTQEC for Device Dependent Noise
@QIP2020 @DukeEngineering @nrenga92 @DriptoDebroy @SeeLamWong @GTCSE Thursday:
14:25 M. Newman, @leoadec (now @qctrlHQ) and KRB.
Crystalline Cluster States for Topological Measurement-Based Quantum Computing

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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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