Austrian Quantum Talks

This website is an overview of all quantum related talks and seminars. 

Overview

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Erwin Schroedinger Lecture
Photonic quantum computing -- a bright future for many applications
Prof. Philipp Walther (University of Vienna)
12.12.2022
17:00
Erwin Schroedinger Institut, Boltzmann Lecture Hall
Erwin Schroedinger Institut
The precise quantum control of single photons, together with the intrinsic advantage of being mobile make optical quantum system ideally suited for quantum information applications that require communication or the delegation of tasks. Examples include quantum cryptography as well as quantum clouds and quantum computer networks. I present the current architectures for scalable photonic quantum computers and special purpose applications that exploit advantages of photonic quantum system. This is shown by examples for various quantum computations such as quantum machine learn! ing and i n particular reinforcement learning, in addition to secure quantum and classical computing tasks that require quantum networks. I will discuss technological challenges for the scale up of photonic quantum computers and remarkable opportunities for special-purpose applications such as neuromorphic circuits.
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Distracted by Science-Fiction: The Physics of Reverse-Engineered Metrics
Distracted by Science-Fiction: The Physics of Reverse-Engineered Metrics
Sebastian Schuster (Charles University, Prague)
13.12.2022
14:00
Erwin Schroedinger Institut, Boltzmann Lecture Hall
S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi
Reverse-engineered metrics are ad-hoc metrics; instead of using the Einstein equation to solve for a metric given a stress-energy tensor as input,the metric is the input and the stress-energy tensor the output. Much of the attention is taken up by metrics inspired by science fiction:Wormholes, warp drives, tractor beams. Historically, however, this was not the case, as both the Gödel universe and regular black holes are similarly reverse-engineered.The goal of this talk will be to demonstrate how the mathematical simplicity (differentiation instead of integration) is ga! ined thro ugh physical difficulty. Usually this is reduced to a question of physicality.Worse this question is then in turn answered in an oversimplified way by invoking (point-wise) energy conditions. I will demonstrate why energy condition cannot easily separate the physical wheat from the metric chaff and how . . .
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Thermal fate and many-body parametric resonances in a driven sine Gordon model
Thermal fate and many-body parametric resonances in a driven sine Gordon model
Roberta Citro (University of Salerno, IT)
16.12.2022
10:00
Atominstitut, Stadionallee 2, Lecture Hall​
Jörg Schmiedmayer
Integrable systems are expected to not thermalize, but it is still an open question if interactions and mode coupling at long times can let the system reach the infinite temperature limit. The questions I will address in this talk are how an integrable quantum system breaks the non-ergodicity and undergoes the thermal fate and how the mode coupling appears at long times. I will give some answers for the many-body Kapitza pendulum and ! the param etric harmonic oscillator, the so-called driven sine-Gordon model. I will also discuss a proposal for experiments with cold atoms.
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101 Fun Things to Do with a Quantum Entanglement Source
101 Fun Things to Do with a Quantum Entanglement Source
Paul Kwiat (University of Illinois at Urbana-Champaign)
11.01.2023
15:30
online
Armando Rastelli
The Quantum Information Revolution is in full swing, and entanglement — the spooky nonclassical, nonlocal connection that can be shared by quantum particles — is the key ingredient. In this talkwe’ll discuss how to create (photon) entanglement, and several applications for secure communication and quantum-enhanced sensing. Time permitting, we’ll include a lesson in quantum cooking..
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The Impact of Imperfect Timekeeping on Quantum Computation
The Impact of Imperfect Timekeeping on Quantum Computation
Jake Xuereb (TU Wien)
11.01.2023
16:15
Atominstitut, TU Wien
Maximilian Prüfer
In order to unitarily evolve a quantum system, an agent requires knowledge of time, a parameter which no physical clock can ever perfectly characterise. In this talk, I will communicate how limitations on acquiring knowledge of time impact quantum computation. The quality of timekeeping an agent has access to impacts the gate complexity they are able to achieve within a computation. Although some tasks such as cooling a qubit can be achieved using a timer of arbitrary quality for control. To carry out these investigations, I will introduce tick distributions, a tool developed in the field of autonomous quantum clocks [1,2] which allows us to understand the operational performance of a clock and the average gate fidelity of a noisy channel introduced by the randomized benchmarking [3,4] community which allows one to investigate the quality of a quantum computation. Putting these techniques together we'll understand how access to robust timekeeping is essential for accurate quantum computation. [1] - P. Erker, M. T. Mitchison, R. Silva, M. P. Woods, N. Brunner, and M. Huber, Autonomous quantum clocks: Does thermodynamics limit our ability to measure time?, Phys. Rev. X 7, 031022 (2017) [2] - M. P. Woods, Autonomous Ticking Clocks from Axiomatic Principles, Quantum 5, 381 (2021) [3] - J. Emerson, R. Alicki, and K. Zyczkowski, Scalable noise estimation with random unitary operators, Journal of Optics B: Quantum and Semiclassical Optics 7, S347 (2005) [4] - M. A. Nielsen, A simple formula for the average gate fidelity of a quantum dynamical operation, Physics Letters A 303, 249 (2002).

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