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@qit-cqt

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Posts 14.03.2025
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Latest posts by @qit-cqt

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.

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.

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.

17.02.2026 05:52 👍 7 🔁 2 💬 1 📌 1
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Quantum Toolbox (15): Relating Relative Entropy and Fidelity (1/6):

15.01.2026 02:04 👍 12 🔁 3 💬 1 📌 1

15. Relating Relative Entropy and Fidelity: bsky.app/profile/qit-...

15.01.2026 02:08 👍 1 🔁 0 💬 0 📌 0
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(6/6)

15.01.2026 02:04 👍 0 🔁 0 💬 0 📌 0
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15.01.2026 02:04 👍 0 🔁 0 💬 1 📌 0
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15.01.2026 02:04 👍 0 🔁 0 💬 1 📌 0
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15.01.2026 02:04 👍 0 🔁 0 💬 1 📌 0
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(2/6)

15.01.2026 02:04 👍 0 🔁 0 💬 1 📌 0
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Quantum Toolbox (15): Relating Relative Entropy and Fidelity (1/6):

15.01.2026 02:04 👍 12 🔁 3 💬 1 📌 1

14. Quantum Pinsker Inequality: bsky.app/profile/qit-...

30.12.2025 06:27 👍 0 🔁 0 💬 0 📌 0
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(6/6)

30.12.2025 06:22 👍 1 🔁 0 💬 0 📌 0
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30.12.2025 06:22 👍 0 🔁 0 💬 1 📌 0
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30.12.2025 06:22 👍 0 🔁 0 💬 1 📌 0
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30.12.2025 06:22 👍 1 🔁 0 💬 1 📌 0
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(2/6)

30.12.2025 06:22 👍 0 🔁 0 💬 1 📌 0
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Quantum Toolbox (14): Quantum Pinsker Inequality (1/6)

30.12.2025 06:22 👍 8 🔁 1 💬 1 📌 1
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Quantum Toolbox (13): Matrix Geometric Mean (1/7)

04.12.2025 07:02 👍 11 🔁 3 💬 1 📌 1

13. Matrix Geometric Mean: bsky.app/profile/qit-...

04.12.2025 07:13 👍 0 🔁 0 💬 0 📌 0
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(7/7)

04.12.2025 07:02 👍 2 🔁 0 💬 0 📌 0
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04.12.2025 07:02 👍 0 🔁 0 💬 1 📌 0
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04.12.2025 07:02 👍 0 🔁 0 💬 1 📌 0
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04.12.2025 07:02 👍 1 🔁 0 💬 1 📌 0
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04.12.2025 07:02 👍 0 🔁 0 💬 1 📌 0
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(2/7)

04.12.2025 07:02 👍 1 🔁 0 💬 1 📌 0
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Quantum Toolbox (13): Matrix Geometric Mean (1/7)

04.12.2025 07:02 👍 11 🔁 3 💬 1 📌 1
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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

02.12.2025 11:35 👍 6 🔁 2 💬 0 📌 0

Indeed, or the (exponential of the) Rényi divergence of order 1/2, as we also like to call it.

05.11.2025 12:41 👍 1 🔁 0 💬 0 📌 0

12. Bretagnolle-Huber Inequality: bsky.app/profile/qit-...

05.11.2025 00:46 👍 3 🔁 0 💬 0 📌 0
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(6/6)

05.11.2025 00:41 👍 3 🔁 0 💬 1 📌 0
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(5/6)

05.11.2025 00:41 👍 1 🔁 0 💬 1 📌 0