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SUMMARY:Artificial Kitaev chains in quantum dots coupled through supercond
 uctors - Prof. Greg Mazur
DTSTART:20251002T130000Z
DTEND:20251002T143000Z
UID:TALK236563@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Majorana zero modes (MZMs)—spinless\, charge-neutral\, zero-
 energy excitations—arise at the boundaries of one-dimensional p-wave sup
 erconductors and are promising building blocks for fault-tolerant quantum 
 computing. Candidate platforms include topological insulators\, spin–orb
 it-coupled semiconducting nanowires\, iron-based superconductors\, and fra
 ctional quantum Hall systems. Here we pursue a bottom-up route: semiconduc
 tor quantum dots with strong spin–orbit coupling\, coupled via supercond
 uctors to realize the unit cell of the Kitaev chain [1\,2]. Using InSb nan
 owires clad with epitaxial aluminum half-shells\, we engineer fine-tuned p
 aired MZMs within minimal chains\, enabling controlled studies of their hy
 bridization\, fermion parity\, and robustness to disorder and gating [3]. 
 I will present an experimental framework for assembling and characterizing
  basic Kitaev-chain components in this hybrid platform\, followed by syste
 matic “chain-scaling” results that track the evolution from a single u
 nit cell to extended chains [4]. I will conclude with outlook protocols fo
 r reading out quantum information in this architecture.\n\n[1] Wang\, G.\,
  Dvir\, T.\, Mazur\, G. P.\, Liu\, C. X.\, van Loo\, N.\, Ten Haaf\, S. L.
 \, ... & Kouwenhoven\, L. P. (2022). Singlet and triplet Cooper pair split
 ting in hybrid superconducting nanowires. Nature\, 612(7940)\, 448-453.\n[
 2] Dvir\, T.\, Wang\, G.\, van Loo\, N.\, Liu\, C. X.\, Mazur\, G. P.\, Bo
 rdin\, A.\, ... & Kouwenhoven\, L. P. (2023). Realization of a minimal Kit
 aev chain in coupled quantum dots. Nature\, 614(7948)\, 445-450.\n[3]  Lei
 jnse\, M. and Flensberg\, K.\, 2012. Parity qubits and poor man's Majorana
  bound states in double quantum dots. PRB\, 86(13)\, p.134528. \n[4] Bordi
 n\, A.\, Liu\, C. X.\, Dvir\, T.\, Zatelli\, F.\, Ten Haaf\, S. L.\, van D
 riel\, D.\, ... & Mazur\, G. P. (2025). Enhanced Majorana stability in a t
 hree-site Kitaev chain. Nature Nanotechnology\, 1-6.\n\n
LOCATION:Seminar Room 3\, RDC
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