Physics and Metaphysics of Wigner’s Friends

Physics and Metaphysics of Wigner’s Friends

2022-04-04
Date: 2022-04-11
Time: 14:15
Location: Quantum Chaos and Quantum Information (Jagiellonian University)
seminar
Speaker:  Marcin Markiewicz ( University of Gdańsk ) Abstract Recently there appeared many works on modified Wigner's Friend paradoxes, which suggest that quantum theory cannot consistently describe the scenario with many observers. In this presentation I will show an alternative approach to this problem, which indicates that the paradoxes are in fact apparent, and the […]

Quantum Complexity of Experiments

2022-04-04
Date: 2022-04-06
Time: 16:00
Location: Team-Net Quantum Computing Colloquium
seminar
Speaker: Jordan Cotler (Harvard University) Abstract We introduce a theoretical framework to study experimental physics using quantum complexity theory. This allows us to address: what is the computational complexity of an experiment? For several 'model' experiments, we prove that there is an exponential savings in resources if the experimentalist can entangle apparatuses with experimental samples. […]

Quantum thermodynamics of coronal heating

2022-04-04
Date: 2022-04-06
Time: 14:15
Location: ICTQT Seminar (room 45)
ICTQT Seminar
Speaker: Alejandro Jenkins (ICTQT) Abstract The question of how heat is persistently transported from the Sun's photosphere (at about 6,000 K) to the much hotter corona (at about 10^6 K) is one of the great open puzzles in astrophysics. Using the quantum Markovian master equation, we show that convection in the stellar photosphere generates plasma […]

Heat release to and entropy production in the electromagnetic and the (linear) gravitational vacua

2022-03-30
Date: 2022-04-04
Time: 12:00
Location: ICTQT Seminar (room 45)
seminar
Speaker: Erik Aurell (KTH Royal Institute of Technology, Stockholm) Abstract A well-studied model in open quantum system theory is a system interacting with a thermal bath of harmonic oscillators at finite temperature. This provides a quantum mechanical model of a classical resistive element in a circuit, and includes as famous examples the Caldeira-Leggett theory of […]

Operational Quantum Average-Case Distance

2022-03-22
Date: 2022-03-28
Time: 14:15
Location: Quantum Chaos and Quantum Information (Jagiellonian University)
seminar
Speaker: Filip Maciejewski (CFT PAN Warszawa) Abstract We introduce operational distance measures between quantum states, measurements, and channels based on their average-case distinguishability. To this end, we analyze the average Total Variation Distance (TVD) between statistics of quantum protocols in which quantum objects are intertwined with random circuits and subsequently measured in a computational basis. […]

Examples of standing gravitational waves in general relativity

2022-03-22
Date: 2022-03-25
Time: 11:00
Location: ICTQT room 42
ICTQT Seminar
Speaker: Sebastian Szybka  (Jagiellonian University) Abstract Standing waves are a quite common phenomenon in physics.They are well understood in linear theories. In Einstein's gravity, which is a nonlinear theory, the lack of superposition principle complicates studies. I will present exact solutions to Einstein equations that correspond to standing gravitational waves. They provide useful toy-models that […]

Physics and Metaphysics of Wigner’s Friends

2022-03-21
Date: 2022-03-25
Time: 12:15
Location: IFTIA Seminar
seminar
Speaker: Marcin Markiewicz  (ICTQT) Abstract Recently there appeared many works on modified Wigner's Friend paradoxes, which suggest that quantum theory cannot consistently describe the scenario with many observers. In this presentation I will show an alternative approach to this problem, which indicates that the paradoxes are in fact apparent, and the source of confusion is […]

Wave and particle realism in quantum delayed-choice experiments

2022-03-21
Date: 2022-03-23
Time: 14:15
Location: ICTQT Seminar (room 45)
ICTQT Seminar
Speaker: Pedro Dieguez (ICTQT) Abstract Wheeler’s delayed-choice experiment, a scenario wherein a classical apparatus, typically an interferometer, is settled only after the quantum system has entered it, has corroborated the complementarity principle. However, the quantum version of Wheeler's delayed-choice experiment has challenged the robustness of this principle. Based on the visibility at the output of […]
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