The last defence this year 🥳💐 Congratulations to Hu Yanglin for successfully defending his thesis, "Quantum Oblivious Transfer: Bounds and Applications", on how to protect privacy with quantum technologies and how to learn quantum systems efficiently. He was advised by @marcotomamichel.bsky.social

Quantum Toolbox (12): Bretagnolle-Huber Inequality (1/6)

What would you do? Many senior academics seem to freeze and go straight ahead!

The senior academic trolley problem: You can go straight ahead, but there is the career of a junior researcher on the track. Or you can go right or left to avoid any calamities. 1/3

Quantum Toolbox (10): Uhlmann's Theorem (1/6)

Please get in touch if you are interested in a PhD on the mathematics of quantum information and its applications to learning and communication.

Quantum Toolbox (9): Sample Complexity Lower Bounds via Mutual Information (1/6)

Congratulations to CQT Principal Investigator @marcotomamichel.bsky.social who has been awarded the prestigious National Research Foundation (NRF) Investigatorship. He receives support for a five-year programme of research starting in August 2025. buff.ly/QrAJWkn

🍾💐 Celebrating a successful thesis defence by Josep Lumbreras Zarapico!! 🍉🧀🍪 Advised by @marcotomamichel.bsky.social, Josep defended his thesis "Bandits Roaming Hilbert Space". He will next join Mile Gu’s group as a research fellow. Congrats and all the best, Dr Josep!

Quantum Toolbox (8): Hadamard's Three-Lines Theorem (1/6)

"I’m interested in how we create quantum primitives which ensure security of data," says Tristan Philippe, one of the first PhD students to start research at CQT under Singapore's National Quantum Scholarships Scheme 🇸🇬 🎓 Read his interview: bit.ly/3Zc95KK

🚨 Job alert 🚨 The group of Principal Investigator @ValerioScarani is looking for a Research Fellow! Find more information and apply here: t.co/PwKZfN6eTA

👏💐Congrats to PhD student Roberto Rubboli who successfully defended his thesis, "Optimization and Additivity of Quantum Relative Entropies"! He was advised by @marcotomamichel.bsky.social‬. Next, he will join the group of Daniel Stilck França at the University of Copenhagen. All the best Dr Roberto!

Quantum Toolbox (7): Continuity of the von Neumann Entropy (1/6)

We are happy to share our work in classical distribution testing "Testing (Conditional) Mutual Information" (arxiv.org/abs/2506.03894), which was recently accepted at COLT 2025. (1/6)

Quantum Toolbox (6): Hoeffding's Inequality (1/7)

Our work "Learning pure quantum states (almost) without regret" (arxiv.org/abs/2406.18370) has received an important extension! We connect the notion of regret with the disturbance caused by projective measurements to efficiently learn pure states (almost) without disturbance. (1/3)

Quantum Toolbox (5): Cauchy-Schwarz Inequality (1/6)

It's time we rename Q-Day to Gidney-Day. arxiv.org/abs/2505.15917

Quantum Toolbox (4): Jordan's Lemma (1/6)

Quantum state-agnostic work extraction (almost) without dissipation: We are excited to share a new application of the multi-armed quantum bandit framework—this time in quantum thermodynamics!

Submit your favorite, itch-to-scratch, drive-you-mad, want-to-see-solved open problems in learning theory to #COLT2025! More info: learningtheory.org/colt2025/cfp... ⏰ Deadline: June 6 AoE

We were excited to host @christophhirche.bsky.social as an outgoing MSCA postdoc here in Singapore and are ready to host again whenever scientific interests align.

The larger-than-life Quantum Duel between Matthias Christandl and Gil Kalai will take place on Tuesday at 6:00 PM (CEST) in Prague. www.learned.cz/en/activitie... Watch the live stream here: www.youtube.com/live/ykBkZB8...

Nice to see the university recognising not only ours but also our significant others’ contributions!

Quantum Toolbox (3): Data-Processing Inequality (1/7)

We are currently looking for a postdoc. If you are intrigued by Singapore and CQT (and you should be) and have experience in mathematical aspects of quantum information, especially with information measures, quantum cryptography or learning theory, get in touch! careers.nus.edu.sg/job/Research...

Quantum Toolbox (2): Schur-Weyl Duality (1/6)

Quantum Toolbox (1): Jensen's Inequality (1/6)

The consecutive measurement theorem makes rigorous and robust the intuition that if there exist measurements that succeed with high probability to guess various properties of a quantum system then two consecutive such measurements can be used to deduce two properties with high probability as well.

This birthday I received a very special present from my group, a quantum information theory toolbox! Follow @qit-cqt.bsky.social as we go through the tools one by one!

The official account of the Quantum Information Theory group at the Centre for Quantum Technologies, Singapore.

Wotkshop 13th Beyond IID in Information Theory quantiki.org/conference/1...

We're looking for a new addition to our group. Drop me a message if you're interested!

The research group of Prof. Christoph Hirche @christophhirche.bsky.social at the University of Hannover (Germany) is looking for a motivated PhD student. #QuantumInformationTheory #QuantumComputing www.quantiki.org/position/phd...

TQC 2025 will take place at IISc Bengaluru, India, September 15-19, 2025. Submission deadline is March 1. tqc-conference.org

Trying this out by announcing our new preprint: Not too long ago, @marcotomamichel.bsky.social and I gave a new definition of quantum f-divergences. Now, we teamed up with Salman Beigi to dive deeper into their properties and how they relate to previous definitions: scirate.com/arxiv/2501.0...