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qit-cqt.bsky.social

@qit-cqt.bsky.social
183 followers 168 following 133 posts
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qit-cqt.bsky.social @qit-cqt.bsky.social · 11/09/2026
A tale of two proofs of the strong converse for quantum capacity, and maybe also one about how to use AI for science without losing the fun in the process: marcotom.info/the-tale-of-...
marcotom.info
The tale of two proofs of the strong converse | Tomamichel Group
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QIP @qipconference.bsky.social · 07/09/2026
The submission servers are now open! Note the two separate key dates for talk submissions: 28 Sept: talk registration deadline (start with title and abstract) 5 Oct: talk submission deadline (add extended abstract, technical paper and arXiv link) Refer to qipconference.org/2027/call/ for details.
qipconference.org
Call for Submissions
QIP 2027 will take place in Singapore from February 20 to 26, 2027. We invite submissions presenting outstanding recent research in the theory of quantum information and computation. Contributions may...
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Centre for Quantum Technologies @quantumlah.bsky.social · 18/08/2026
Frits Verhagen successfully defended his thesis "Classical And Quantum Information Measures Characterizing Convertibility: An Axiomatic Approach". 🥂 Congrats!👏 He was advised by @marcotomamichel.bsky.social and Erkka Haapasalo. Frits will be starting a postdoc at NTU. All the best, Dr Frits! 🎓️
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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.
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qit-cqt.bsky.social @qit-cqt.bsky.social · 15/01/2026
Quantum Toolbox (15): Relating Relative Entropy and Fidelity (1/6):
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qit-cqt.bsky.social @qit-cqt.bsky.social · 15/01/2026
Quantum Toolbox (15): Relating Relative Entropy and Fidelity (1/6):
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qit-cqt.bsky.social @qit-cqt.bsky.social · 30/12/2025
Quantum Toolbox (14): Quantum Pinsker Inequality (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 04/12/2025
Quantum Toolbox (13): Matrix Geometric Mean (1/7)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 04/12/2025
Quantum Toolbox (13): Matrix Geometric Mean (1/7)
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Centre for Quantum Technologies @quantumlah.bsky.social · 02/12/2025
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
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qit-cqt.bsky.social @qit-cqt.bsky.social · 05/11/2025
Quantum Toolbox (12): Bretagnolle-Huber Inequality (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 16/10/2025
Quantum Toolbox (11): Generalized Operator Schwarz Inequality (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 29/09/2025
Quantum Toolbox (10): Uhlmann's Theorem (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 10/09/2025
Quantum Toolbox (9): Sample Complexity Lower Bounds via Mutual Information (1/6)
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Centre for Quantum Technologies @quantumlah.bsky.social · 10/09/2025
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
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Centre for Quantum Technologies @quantumlah.bsky.social · 12/08/2025
🍾💐 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!
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qit-cqt.bsky.social @qit-cqt.bsky.social · 01/08/2025
Quantum Toolbox (8): Hadamard's Three-Lines Theorem (1/6)
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Centre for Quantum Technologies @quantumlah.bsky.social · 17/06/2025
👏💐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!
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Centre for Quantum Technologies @quantumlah.bsky.social · 16/06/2025
"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
bit.ly
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
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qit-cqt.bsky.social @qit-cqt.bsky.social · 05/07/2025
Quantum Toolbox (7): Continuity of the von Neumann Entropy (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 13/06/2025
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)
arxiv.org
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...
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qit-cqt.bsky.social @qit-cqt.bsky.social · 11/06/2025
Quantum Toolbox (6): Hoeffding's Inequality (1/7)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 07/06/2025
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)
arxiv.org
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...
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qit-cqt.bsky.social @qit-cqt.bsky.social · 06/06/2025
Quantum Toolbox (5): Cauchy-Schwarz Inequality (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 23/05/2025
Quantum Toolbox (4): Jordan's Lemma (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 21/05/2025
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!
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qit-cqt.bsky.social @qit-cqt.bsky.social · 19/05/2025
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.
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qit-cqt.bsky.social @qit-cqt.bsky.social · 09/05/2025
Quantum Toolbox (3): Data-Processing Inequality (1/7)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 04/05/2025
Quantum Toolbox (2): Schur-Weyl Duality (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 24/04/2025
Quantum Toolbox (1): Jensen's Inequality (1/6)
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qit-cqt.bsky.social @qit-cqt.bsky.social · 24/04/2025
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: 🧵
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qit-cqt.bsky.social @qit-cqt.bsky.social · 18/04/2025
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.
scirate.com
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...
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Marco Tomamichel @marcotomamichel.bsky.social · 10/04/2025
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!
quantum information toolbox
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qit-cqt.bsky.social @qit-cqt.bsky.social · 14/03/2025
The official account of the Quantum Information Theory group at the Centre for Quantum Technologies, Singapore.
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