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X-WR-CALNAME:Instituto de Física Teórica
X-ORIGINAL-URL:https://www.ift.uam-csic.es
X-WR-CALDESC:Events for Instituto de Física Teórica
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TZID:Europe/Madrid
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DTSTART;TZID=Europe/Madrid:20261022T113000
DTEND;TZID=Europe/Madrid:20261022T123000
DTSTAMP:20261017T040523
CREATED:20261014T151836Z
LAST-MODIFIED:20261014T151836Z
UID:25860-1792668600-1792672200@www.ift.uam-csic.es
SUMMARY:Quantum Info JC: "An operational continuum limit of quantum processes"
DESCRIPTION:Title: An operational continuum limit of quantum processes \nVenue & Time: 11:30 / Gray Room 3 \nAbstract: Quantum combs are a powerful tool for investigating quantum processes and their multi-time correlations in quantum information theory. However\, they do not naturally accommodate a physical connection to time\, and their probes are inherently instantaneous\, meaning control strength is not encoded in the theory. \nIn this talk I will present our work which introduces a framework of continuous process tensors (cPTs) for combs in a process context\, remedying this situation. Here\, process tensors are represented by bosonic field theory vectors on the relevant time interval. Associating controls with particle insertions allows us to relate the distinguishing power of instruments with the energetic resources required to implement them. For example\, recovering the discrete case\, instantaneous probes correspond to particle number eigenstates with infinite Fock space norm. As I will elaborate\, this finite-energy perspective also yields well-behaved measures of non-Markovianity\, fixing contradictory properties of standard measures. \nBuilding on this\, we also proved via an explicit dilation theorem that our framework connects to the Schrödinger equation. This gives physical context\, showing that any cPT can be approximated arbitrarily well in Fock space norm by a coupled system-environment dynamics. I will explain in more detail this theorem and show how it enables a set of structural results\, such as Choi duality in the continuum and a rigorous treatment of measurements. \nOur framework thus fills a substantial gap in the quantum information literature by enabling the physically-consistent study of open quantum dynamics and multi-time correlations in the continuum.
URL:https://www.ift.uam-csic.es/event/quantum-info-jc-an-operational-continuum-limit-of-quantum-processes/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20261022T120000
DTEND;TZID=Europe/Madrid:20261022T130000
DTSTAMP:20261017T040523
CREATED:20261015T081424Z
LAST-MODIFIED:20261015T151902Z
UID:25867-1792670400-1792674000@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: "Journey to the Centre of the Black Hole" by Matthew J. Blacker
DESCRIPTION:Strings\, Pheno and the Swampland (SPS) Journal Club. Every Thursday at 12:00 in the Red Room. \nTitle: “Journey to the Centre of the Black Hole” \nVenue & Time: Red Room / 12:00 \n Speaker: Matthew J. Blacker \nAbstract: What can we say about holographic theories\, given what we know about the bulk? Conversely\, how can we use holographic theories to probe regions of the bulk where classical physics breaks down? This talk will explore the link between bulk canonical quantum gravity and holographic theories\, using radial Wheeler-DeWitt states as the bridge. We will discuss how Wheeler-DeWitt states can be used a) to constrain putative holographic duals to de Sitter space\, and b) to probe the interior of black holes and the (chaotic) approach to the singularity. Finally\, we will explain how these radial states relate to $T^2(+ \Lambda_2)$ deformed field theories.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-2/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20261022T170000
DTEND;TZID=Europe/Madrid:20261022T180000
DTSTAMP:20261017T040523
CREATED:20261015T080624Z
LAST-MODIFIED:20261015T080624Z
UID:25865-1792688400-1792692000@www.ift.uam-csic.es
SUMMARY:Old Journal Club: “Distortions of the Background Radiation Spectrum”
DESCRIPTION:Title: Distortions of the Background Radiation Spectrum \nSpeaker: Mikel Martin Barandiaran \nVenue & Time: Blue Room / 17:00 \nAbstract: The discovery of cosmic blackbody radiation with a temperature of 2.7 K is widely considered as powerful evidence for the hot\, big-bang model of the universe. As first discussed by Gamow\, it is assumed that a very hot\, dense plasma was present during the early stages of the universe\, and interaction of photons and electrons leads inevitably to an equilibrium (blackbody) spectrum. The shape of the equilibrium spectrum is preserved during the subsequent expansion and cooling\, although the radiation temperature decreases to the value of 2.7 K observed today.
URL:https://www.ift.uam-csic.es/event/old-journal-club-distortions-of-the-background-radiation-spectrum/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
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