August 2025 - ITP-quantumseminare

Thursday's QIT seminar
by Ladina Hausmann 25 Aug '25

25 Aug '25

Hi all, This week, Apostolos Giovanakis will talk about “An Operational Perspective on Non-Ideal Quantum Reference Frames”. See below for the abstract. The talk will take place on Thursday at 11:00 in HIT E41.1. Best, Ladina

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Monday's QIT seminar at 11:15 in HIT F32
by Ladina Hausmann 15 Aug '25

15 Aug '25

Hi all, Next Monday, Elias Rothlin will tell us about “Exploring the Connection between Gauge Theory and Quantum Error Correction via Quantum Reference Frames”. See below for the abstract. The talk will take place on Monday at 11:15 in HIT F 32. Best, Ladina **** Title: Exploring the Connection between Gauge Theory and Quantum Error Correction via Quantum Reference Frames Abstract: How is physical information robustly preserved in quantum gauge theories? One possible way of addressing this question is by noticing that gauge systems share a key feature with quantum error correction codes (QECCs): in both cases, the relevant information is redundantly encoded in a larger space. In gauge theories, this ensures invariance under certain gauge symmetry transformations, while in QECCs, it protects logical data against noise by distributing it as entanglement across many subsystems. This connection has been made precise in prior work where stabilizer QECCs were interpreted as gauge systems and their error correction properties were investigated via the perspective-neutral framework of quantum reference frames (QRFs). Applying the tools of this formalism, we identify sets of correctable errors for general gauge systems viewed as QECCs. As an example, we analyze lattice quantum electrodynamics as a QECC and its correctable errors tied to QRFs and to syndrome measurements.

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Thursday's QIT seminar at 14:00 in HIT E41.1
by Ladina Hausmann 12 Aug '25

12 Aug '25

Hi all, This week, our visitor Richard Kueng will talk about “Quantum-enhanced shadow tomography of (very many) Pauli observables”. See below for the abstract. The talk will take place on Thursday at 14:00 in HIT E41.1 Best, Ladina **** Title: Quantum-enhanced shadow tomography of (very many) Pauli observables Abstract: Shadow tomography protocols have recently emerged as powerful tools for efficient quantum state learning, aiming to reconstruct expectation values of observables with considerably fewer resources than traditional quantum state tomography. For the particular case of estimating Pauli observables, entangling two-copy measurement schemes can offer an exponential improvement in sample complexity over any single-copy strategy conceivable [Huang, Kueng, Preskill, PRL (2021)]. A recent refinement of these ideas by King et al. King, Gosset, Kothari, Babbush, SODA (2025)] does not only achieve polynomial sample complexity, but also maintains reasonable computational demands and utilizes joint measurements on only a small constant number of state copies. This ‘triple efficiency’ is achievable for any subset of n-qubit Pauli observables, whereas single-copy strategies can only be efficient if the Pauli observables in question have advantageous structure. In this work, we complement existing theoretical performance guarantees with the empirical evaluation of triply efficient shadow tomography using classical, noise-free simulations. Our findings indicate that the empirical sample complexity aligns closely with theoretical predictions for stabilizer states and, notably, demonstrates slightly improved scaling for random Gibbs states compared to established theoretical bounds. In addition, we improve a central subroutine in the triply-efficient shadow protocol by leveraging insights from a refined quantum and quantum-inspired convex optimization algorithm [Henze et al. arXiv:2502.15426 (2025)].

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Nur noch 1 Schritt bis zu Ihrem E-Bike Gewinn!
by Ethan From TEMU 09 Aug '25

09 Aug '25

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Ihr kostenloses Wanderpaket wartet – 1 Minute Umfrage genügt!
by Decathlon 05 Aug '25

05 Aug '25

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No seminar planned this week
by Ladina Hausmann 04 Aug '25

04 Aug '25

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

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