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
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).
May 13, 2020 • 9 tweets • 10 min read
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
Simulating water on a quantum computer with @IonQ_Inc nature.com/articles/s4153…
As we all know quantum computers are currently small and do not solve chemistry problems better than a classical computer cluster.
Mar 23, 2020 • 20 tweets • 3 min read
Exponents and Logarithms: A Tutorial Thread 1/n
We are all familiar with addition
but somehow the US has done a poor job teaching its citizens exponents and logarithms 2/n
Mar 13, 2020 • 7 tweets • 3 min read
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
Mar 10, 2020 • 10 tweets • 3 min read
❄️👨💻👩🏾🔬❄️New cold chemistry paper! Our theory collaborators @TempleUniv, Hui Li, Ming Li, Alexander Petrov, and Svetlana Kotochigova, explain the charge exchange rate for K + Ca+ -> Ca + K+ that Jyothi Saraladevi (@DukeEngineering) measured. arxiv.org/abs/2003.03430
Taking place at 200 mK (-273 C or -459 F), it is probably the coldest reaction on @DukeU campus but I would need to check with @DukeChemistry
Poster 118 -N. Brown, M. Newman and KRB
Conditions for fault tolerance in the presence of leakage
Oct 23, 2019 • 5 tweets • 1 min read
My Intro to Q. Eng. class today was supposed to cover ion trap gates. (We covered superconductor gates last week). The students demanded to hear about the Google experiment. I told them I would do a quick five minutes and we could cover it in more detail on Monday.
1 hr later the class ended. We covered the following items briefly: technical changes between Google Bristlecone and Sycamore (worked well with the material from last week), what are quantum sampling problems about and why are they hard classically, and the IBM simulation paper.
Apr 30, 2019 • 4 tweets • 2 min read
Earlier this month I was quoted in @cenmag about ion trap quantum computers.
Two years ago, I was quoted in @cenmag about materials simulations on near-term devices.
Apr 27, 2019 • 4 tweets • 2 min read
New paper examining circuit level error models for error correction circuits composed of qubits that leak and noisier qubits that don't leak. We find that for a physically motivated leakage model, a mixture of qubits works best. arxiv.org/abs/1904.10724
This paper is the third in a series.
In paper 1, Natalie Brown and I compared two types of ion qubits (hyperfine=leaky, Zeeman=noisy) for toric codes using a standard leakage model. Zeeman wins for low magnetic field noise. arxiv.org/abs/1803.02545
Apr 18, 2019 • 7 tweets • 3 min read
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 .