[Physics-grads-open] PASS talk on Quantum Computing

[Pooyan Goodarzi]

Hi all,


We will have our next PASS talk on Monday with Shelby talking about his 
work on Quantum Computing. Please join us on *November 4th (Monday)* at 
*noon* (from 12:00 pm to 1:00 pm) in the *Nebula Room* (PHYS 3027).


*Shelby Mo, PhD student*

Monday, 12:00 pm, Nebula Room (PHYS 3027)

*Modular Fault tolerant scaling of a quantum chip with lossy links*
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A modular approach presents a highly promising direction for scalable 
quantum computing. In this work, we show that separate patches of 
rotated surface code can be reliably connected through a fault-tolerant 
interface, even in the presence of substantial noise. By implementing a 
ZigZag cut along the boundary and using a pair of entangled ancillas as 
an extraction gadget—similar to Shor's gadget, hereafter referred to as 
the CAT ancilla—our design withstands up to 28 times more noise at the 
interface than in the bulk, doubling the best-known tolerance to date 
(Ramette /et al./, 2024). Our approach also cleverly mitigates hook 
errors through an optimized measurement schedule and strategic boundary 
choice between modules. Achieving a high interface noise threshold 
around 18% and a bulk threshold near 1%, this design enables 
exceptionally low logical error rates, marking a critical step toward 
practical fault-tolerant scaling of modular quantum devices with 
existing technologies.


If you’re interested in sharing your work as a speaker, please feel free 
to add your name to the spreadsheet [Google Sheet 
<https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing>].


Best,
Pooyan
Physics and Astronomy Student Seminar (PASS)
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