iiinova — where your digital self keeps evolving

Afham

@afhamash.bsky.social

210 followers 185 following 24 posts

Research Fellow at the Centre for Quantum Technologies, National University of Singapore. Postdoc-ing instead of Age of Empires-ing. Malayali.

Posts Replies Media

Afham @afhamash.bsky.social · 01/10/2026

New preprint with @sayantansen.bsky.social and @marcotomamichel.bsky.social!! In Fast and Sure-ious QPT, we describe a simple and rigorous way to lift any QST algorithm (in fidelity) to a QPT algorithm, while allowing for all guarantees to transfer! scirate.com/arxiv/2609.3...

Abstract of the preprint "Fast and Sure-ious Quantum Process Tomography"

122

Afham @afhamash.bsky.social · 04/09/2026

New preprint out! Paradoxical: both my first 'solo-authored' and first LLM-assisted paper. Projected Riemannian Gradient Descent for the Bures-Wasserstein Barycenter: Dimension-Independent Linear Convergence at Unit Step Size scirate.com/arxiv/2609.0... Also an ML paper with applications to QI?

110

Reposted by Afham

arXiv bot (quant-ph) @krxiv-quant-ph.bsky.social · 18/02/2026

Entanglement in the Dicke subspace arxiv.org/pdf/2602.15800 Aabhas Gulati, Ion Nechita, Clément Pellegrini.

arxiv.org

https://arxiv.org/abs/2602.15800

arXiv abstract link

032

Reposted by Afham

arXiv bot (quant-ph) @krxiv-quant-ph.bsky.social · 17/02/2026

Projections with Respect to Bures Distance and Fidelity: Closed-Forms and Applications arxiv.org/pdf/2602.14732 A. Afham, Marco Tomamichel.

arxiv.org

https://arxiv.org/abs/2602.14732

arXiv abstract link

022

Afham @afhamash.bsky.social · 17/02/2026

New preprint out with @marcotomamichel.bsky.social ! Projections with Respect to Bures Distance and Fidelity: Closed-Forms and Applications scirate.com/arxiv/2602.1... We derive simple closed-form solutions for fidelity / Bures/purified distance projections to various sets of interest.

A meme indicating how various objects in quantum information (pretty good measurement, Petz recovery map, Leifer-Spekkens state over time, and others) are shown to be fidelity/Bures projections in our article.

192

Afham @afhamash.bsky.social · 21/03/2025

Q: Let X be a (non-Hermitian) matrix with positive eigenvalues (such X = AB, where A,B >= 0) and let Λ be a Completely positive map. Is Λ(X) guaranteed to be a matrix with positive eigenvalues? That is, do CP maps take EVERY (including non-Herm) matrix with pos evals to matrices with pos evals?

110