[Joint CQSE & NCTS Special Seminar] High fidelity magic state preparation with non-local connectivity

Title: [Joint CQSE & NCTS Special Seminar] High fidelity magic state preparation with non-local connectivity
Speaker: Pei-Kai Tsai (Yale University)
Time: 2026/1/19 (Mon.) 14:30
Place: NCTS Physics Lecture Hall, 4F, Chee-Chun Leung Cosmology Hall, NTU
Online: https://nationaltaiwanuniversity-zbh.my.webex.com/nationaltaiwanuniversity-
zbh.my/j.php?MTID=m314bb49889ca5a7ce97eed6d55ff1beb
 

Abstract
Magic state cultivation is a state-of-the-art protocol to prepare high-fidelity non-
Clifford resource states for universal quantum computation. It offers a significant
reduction in spacetime overhead compared to traditional magic state distillation
techniques. Cultivation protocols involve measuring a transversal logical Clifford
operator on an initial small-distance code and then rapidly growing to a larger-distance
code. In this work, we present a new cultivation scheme in which we measure the fold-
transversal Hadamard of the unrotated surface code, and leverage unitary techniques to
grow within the surface code family. Using both stabilizer and state vector simulations
we find that this approach achieves the lowest known spacetime overhead for magic
state cultivation. Practical implementation of our protocol is best suited to architectures
with non-local connectivity, showing the strength of architectures where such
connectivity is readily available.
 
Biography
Pei-Kai Tsai is a Ph.D. candidate in Applied Physics at Yale University, working on
quantum error correction for discrete qubit architectures. His recent research focuses on
fault-tolerant quantum state preparation in quantum error-correcting codes. He received
his B.S. in Physics from National Taiwan University in 2021.

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