July 2024 - ITP-quantumseminare - lists.phys.ethz.ch

No seminar this week
by Ladina Hausmann 29 Jul '24

29 Jul '24

Hi all, There is no seminar planned for this week. Best, Ladina

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This Friday's QIT seminar
by Ladina Hausmann 22 Jul '24

22 Jul '24

Hi all, This week we have a talk by our visitor Nick Spooner on “An efficient quantum parallel repetition theorem”, see below for the abstract. The talk will take place on Friday at 14:00 in HIT K51. Best, Ladina ************ Title: An efficient quantum parallel repetition theorem Abstract: A fundamental question in cryptography is whether the security of a “weak” cryptographic primitive can be generically amplified. We investigate this question in the quantum setting. We prove a general security amplification result for any quantum cryptographic primitive with a three-message security game, including (canonical) quantum commitments and quantum money.

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Thursday's QIT seminar at 14:00 in HIT E41.1
by Ladina Hausmann 15 Jul '24

15 Jul '24

Hi all, this week Petr Ivashkov will tell us about his master thesis "Exploring improvements of quantum-enhanced Markov chain Monte Carlo", see below for the abstract. The talk will take place on Thursday at 14:00 in HIT E41.1 and on zoom https://ethz.zoom.us/j/362994444. Best, Ladina ************ Title: Exploring improvements of quantum-enhanced Markov chain Monte Carlo Abstract: Sampling from Boltzmann distributions is crucial in scientific computing with applications ranging from statistical physics to machine learning. Recently, Layden et al. [Nature 619, 282–287 (2023)] proposed a quantum-enhanced Markov chain Monte Carlo (MCMC) algorithm that uses quantum dynamics to propose transitions between classical states. While this algorithm showed an empirical polynomial speedup, the physical origin of the speedup remains unclear. We analyze the parameter regimes of quantum-enhanced MCMC for optimal performance and conjecture that the observed speedup is connected to the phase transition of the quantum spin glass. Additionally, we explore alternative quantum proposal strategies using classically optimized time-dependent Hamiltonian evolution. Looking forward, we expect that our empirical findings will aid future theoretical studies in understanding the precise mechanisms underlying the quantum speedup.

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No QIT seminar this week
by Ladina Hausmann 09 Jul '24

09 Jul '24

Hi all, there is no QIT seminar planned for this week. Best, Ladina

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This weeks QIT seminar
by Ladina Hausmann 01 Jul '24

01 Jul '24

Hi all, This week our visitor Marco Tomamichel will tell us about “Conditional Rényi entropies from alpha to z and beyond”. The talk will take place on Friday at 14:00 in HIT F31.2. See below for the abstract. Best, Ladina ******** Title: Conditional Rényi entropies from alpha to z and beyond Abstract: This work in progress is an attempt to bring a little bit more order into the entropy zoo. We start with the observation that general alpha-z conditional entropies as defined so far are not closed under the entropic duality relation which relates conditional entropies for pure states. We solve this problem by introducing another parameter and thus a much larger class of conditional entropies that satisfy data-processing and additivity, and is closed under duality. We hope that this perspective eventually will lead to complete characterisations of conditional Rényi entropies and tighter entropic inequalities, but here I just report on some initial steps.

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