@qit-cqt.bsky.social
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.
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 (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!
👏💐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!
"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
Meet a CQTian: Tristan Philippe - CQT - Centre for Quantum Technologies
For French student Tristan, Singapore’s National Quantum Scholarship supports him to work on theoretical quantum cryptography
bit.ly
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)
Testing (Conditional) Mutual Information
We investigate the sample complexity of mutual information and conditional mutual information testing. For conditional mutual information testing, given access to independent samples of a triple of ra...
arxiv.org
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)
Learning pure quantum states (almost) without regret
We initiate the study of sample-optimal quantum state tomography with minimal disturbance to the samples. Can we efficiently learn a precise description of a quantum state through sequential measureme...
arxiv.org
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!
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.
European Commission@ec.europa.eu · last yr.Choose Science. Choose Europe. In 2025, Marie Skłodowska-Curie Actions will invest over €1.25B, supporting more than 10,000 researchers. A new Choose Europe for Science pilot will promote stable research careers across the EU. Explore the calls ↓
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...
Research Fellow (Quantum Information Theory)
Research Fellow (Quantum Information Theory)
careers.nus.edu.sg
In a series of posts, we aim to present a set of essential tools & techniques that we believe every aspiring quantum information theorist should have in their toolbox. 🧰🛠️ We think these techniques will also be useful for researchers in adjacent fields. All tools will be linked in this thread: 🧵
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.
A tight consecutive measurement theorem and its applications
In many cryptographic tasks, we encounter scenarios where information about two incompatible observables must be retrieved. A natural approach is to perform consecutive measurements, raising a key que...
scirate.com
