Search Results for author: Marco Tomamichel

Found 6 papers, 2 papers with code

Linear bandits with polylogarithmic minimax regret

no code implementations19 Feb 2024 Josep Lumbreras, Marco Tomamichel

We study a noise model for linear stochastic bandits for which the subgaussian noise parameter vanishes linearly as we select actions on the unit sphere closer and closer to the unknown vector.

Quantum contextual bandits and recommender systems for quantum data

no code implementations31 Jan 2023 Shrigyan Brahmachari, Josep Lumbreras, Marco Tomamichel

Using this model we formulate the low energy quantum state recommendation problem where the context is a Hamiltonian and the goal is to recommend the state with the lowest energy.

Multi-Armed Bandits Recommendation Systems

Quantum attacks on Bitcoin, and how to protect against them

no code implementations28 Oct 2017 Divesh Aggarwal, Gavin K. Brennen, Troy Lee, Miklos Santha, Marco Tomamichel

We investigate the risk of Bitcoin, and other cryptocurrencies, to attacks by quantum computers.

Quantum Physics General Finance

Non-asymptotic entanglement distillation

1 code implementation19 Jun 2017 Kun Fang, Xin Wang, Marco Tomamichel, Runyao Duan

For isotropic states, it can be further simplified to a linear program.

Quantum Physics

A largely self-contained and complete security proof for quantum key distribution

no code implementations28 Jun 2015 Marco Tomamichel, Anthony Leverrier

In this work we present a security analysis for quantum key distribution, establishing a rigorous tradeoff between various protocol and security parameters for a class of entanglement-based and prepare-and-measure protocols.

Quantum Physics

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