ITP-quantumseminare

itp-quantumseminare@lists.phys.ethz.ch

1 participants
1357 discussions

Next weeks QIT seminars
by Ladina Hausmann 10 Oct '24

10 Oct '24

Hi all, Next week we will have two seminars both will be in HIT E41.1 1. On Monday at 16:00 Antonia Weber will talk about “The Bose-Marletto-Vedral proposal in different frames of reference and the quantum nature of gravity” 2. On Tuesday at 13:00 Elias Rothlin will talk about "Bridging Quantum Error Correction, Gauge Theory Quantisation and Quantum Reference Frames” see below for the abstracts. Best, Ladina %%%%%%%%%%%%%%%%%%%%% Title: The Bose-Marletto-Vedral proposal in different frames of reference and the quantum nature of gravity Abstract: Observing spatial entanglement in the Bose-Marletto-Vedral (BMV) experiment would demonstrate the existence of non-classical properties of the gravitational field. We show that the special relativistic invariance of the linear regime of general relativity implies that all the components of the gravitational potential must be non-classical. This is simply necessary in order to describe the BMV entanglement consistently across different inertial frames of reference. On the other hand, we show that the entanglement in accelerated frames could differ from that in stationary frames. ********************** Titel: Bridging Quantum Error Correction, Gauge Theory Quantisation and Quantum Reference Frames Abstract: By encoding logical data in the entanglement structure of a larger set of physical qubits, quantum error correction (QEC) paves the way for fault-tolerant quantum computing. Lately, ideas from QEC have also found applications in other areas of theoretical physics, e.g. as toy models for holography. In this talk, I will connect concepts in the stabilizer formalism of QEC with the Dirac quantization of gauge theories as well as quantum reference frames (QRFs). The latter connection will be made explicit by interpreting the code subspace in a system of physical qubits as a perspective-neutral structure as introduced for QRFs. Lastly, I will provide perspectives on the future developments and potential applications arising from these connections.

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No QIT seminar next week
by Ladina Hausmann 04 Oct '24

04 Oct '24

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

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Monday's QIT seminar at 16:00 in E41.1.
by Ladina Hausmann 26 Sep '24

26 Sep '24

Hi all, Next week Antoine Coquet will talk about “Ruling out N-partite quantum causal networks as a complete theory of Nature”, see below for the abstract. The talk will take place on Monday at 16:00 in HIT E41.1. Best, Ladina *** Title: Ruling out N-partite quantum causal networks as a complete theory of Nature Abstract: A fundamental pursuit of physics is to understand correlations between events, or, in other words, causal relationships. Causal networks are a useful conceptual tool to study such causal structures. In this talk, we will: i) Give a brief introduction to the different types of correlations in Nature and to causal networks. ii) Introduce the class of proof techniques called "proofs by inflation" alongside a novel instance of such proofs which was developed in the course of the present work. iii) Use the above to prove that Nature’s correlations cannot be captured by quantum causal networks of N-partite quantum resources even when allowing for unlimited access to shared classical randomness.

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No QIT seminar this week
by Ladina Hausmann 20 Sep '24

20 Sep '24

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

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QIT seminar next week, new time for the semester
by Ladina Hausmann 13 Sep '24

13 Sep '24

Hi all, there is no QIT seminar planned for next week. We changed the seminar timeslot because the new semester will start next week. This semester it is Mondays at 16:00. Best, Ladina

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QIT seminars this week
by Ladina Hausmann 09 Sep '24

09 Sep '24

Hi all, this week we will have two seminars: - On Tuesday at 14:00 in HCI F2 Viktoria Kabel will talk about “Quantum Reference Frames & Subregions in Spacetime” - On Friday at 14:00 in HIT J52 Jakob Miller will talk about “Improving the performance of two-source randomness extractors against quantum side-information” see below for the abstracts. Best, Ladina *** Title: Quantum Reference Frames & Subregions in Spacetime Abstract: In this talk, I will dive into the connection between quantum reference frames and the study of subregions in general relativity. The first part of the talk will motivate the concept of edge modes - additional degrees of freedom that arise at the boundary of subregions in gauge theory and gravity - and provide a gentle introduction to the mathematical tools used to study them. In the second part of the talk, these ideas will be applied to subregions in linearised general relativity. Here, edge modes arise naturally at the boundary of spacetime subregions and can be interpreted as reference frames for the diffeomorphism group. When quantising the theory, we must account for these degrees of freedom, which gives rise to quantum reference frames at the boundary of spacetime. *** Title: Improving the performance of two-source randomness extractors against quantum side-information Abstract: In most (quantum) cryptographic protocols perfect randomness is an essential resource that is typically taken for granted, although the existence of real-world sources of perfect randomness is questionable. Fortunately, randomness extractors can bridge the gap between theory and implementation. Illustrated by the above application, in this talk we introduce two-source extractors against quantum/classical side-information. In particular, we discuss side-information in the product and Markov model. We derive a new XOR lemma that allows for significant improvements of the achievable output length of the extractors first introduced by Dodis et al. and that promises further improvements for a wide range of two-source extractors.

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No seminar this week
by Ladina Hausmann 03 Sep '24

03 Sep '24

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

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Thursday's QIT seminar in E41.1 at 14:00
by Ladina Hausmann 26 Aug '24

26 Aug '24

Hi all, this week Mattia Chiruco will tell us about his semester thesis "Assessing quantum circuits for 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. Best, Ladina ******** Title: Assessing quantum circuits for quantum-enhanced Markov chain Monte Carlo Abstract: Quantum computing offers the potential to revolutionize the way we approach complex computational problems, providing solutions at speeds unattainable by classical methods. In this presentation, we explore two cutting-edge quantum algorithms designed to enhance Markov chain Monte Carlo (MCMC) methods, a vital tool in areas such as machine learning and statistical physics. The first algorithm, Quantum-enhanced MCMC, developed by D. Layden et al., integrates quantum computation to propose transitions, while relying on classical computation for acceptance or rejection, aiming to improve the efficiency of the MCMC process. The second algorithm, proposed by Y. Nakano et al., introduces a QAOA-type circuit that fine-tunes parameters for specific problem instances, offering a tailored approach to MCMC enhancement. This presentation will compare these two algorithms, evaluating their approaches, outcomes, strengths, and limitations, particularly in relation to their feasibility on current quantum hardware and their potential impact on practical applications.

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No QIT seminar this week
by Ladina Hausmann 19 Aug '24

19 Aug '24

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

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No QIT seminar this week
by Ladina Hausmann 12 Aug '24

12 Aug '24

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

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ITP-quantumseminare