Quantum Steampunk -- FQXi Podcast by Nicole Yunger Halpern
By FOUNDATIONAL QUESTIONS INSTITUTE, FQXI • May. 23, 2022 @ 16:09 GMT

On the latest edition of the FQXi podcast, quantum physicist Nicole Yunger Halpern talks about her new book, "Quantum Steampunk," on quantum thermodynamics, temperatures below absolute zero, and the physics of yesterday's tomorrow.

I also mention that Ian Durham, who regular visitors know well as an FQXi member, quantum physicist and frequent FQXi podcast contributor, is running a summer school at Saint Anselm College in New Hampshire. It's on quantum computing and here are some more details from Ian:

Science and engineering stand before a new paradigm in which the exploitation of quantum phenomena offers major breakthroughs in sensing and measurement, computing and simulation, and communication and networking. Be a part of this revolution by joining Q-School!

Q-School is a two-week summer program taking place July 11 - 22, 2022 aimed at high school students wanting to develop real-world knowledge of quantum physics and information science. Through daily lectures and laboratory sessions, and an immersive experience with like-minded peers, students will learn the basics of quantum physics and computation, and ultimately develop and run code on a quantum computer."

The website is www.anselm.edu/q-school.



Keywords: #FQXiPodcast #QuantumSteampunk #QuantumThermodynamics #FFF #FetzerFranklinFund #InformationAsFuel #AbsoluteZero #Temperature #IanDurham #QSchool


Fingerprints of Invisibles
By ZEEYA MERALI • May. 21, 2022 @ 15:26 GMT

İzzet Sakallı of Eastern Mediterranean University in Northern Cyprus and Sara Kanzi of Final International University have published a topical review article, "Greybody Factors and Quasinormal Modes for Black Holes in Various Theories – Fingerprints of Invisibles" in the Turkish Journal of Physics, a scientific journal of Scientific And Technological Research Council Of Turkey, (Turk J Phys (2022) 46: 51 – 103 © TUBİTAK https://doi.org/10.55730/1300-0101.2691, arXiv preprint (2022).)

From İzzet Sakallı:

Black holes, a generic prediction of Einstein’s General Relativity, are objects of paramount importance both for classical and quantum gravity. Greybody factors and quasinormal modes are two topics related to black hole physics of particular interest. On the one hand, Hawking since it is as a manifestation of a quantum effect in curved spacetime, has always attracted a lot of interest although it has not been detected in the Universe yet. The emitted particles feel an effective potential that back scatters part of the emitted radiation back into the black hole. The greybody factor is a frequency dependent quantity that measures the deviation from the original black body radiation spectrum and provides us with valuable information about the black hole horizon structure. On the other hand, LIGO historical direct detection of gravitational waves from black hole mergers has opened a completely new window to our Universe and allows us to test gravity and probe strong gravitational fields. Consequently, lately there is an increasing interest in black hole perturbations and quasinormal modes of black holes, intimately related to the ring down phase after the formation of the distorted object during the merging of two black holes. When a black hole is perturbed the geometry of spacetime undergoes dumped oscillations, which are characterized by the quasinormal modes with a non-vanishing imaginary part. Chandrasekhar’s famous monograph “The Mathematical Theory of Black Holes” provides us with a comprehensive overview of black hole perturbations.

The study, published April 28 in the Turkish Journal of Physics (doi:10.3906/fiz-2203-15), reviewed the various analytical and numerical methodologies to derive the greybody factors and quasinormal modes of the black holes and black hole like curved spacetimes. The physicists gave specific examples about how one can compute the greybody factors and quasinormal modes. Theoretical findings are also linked to current and possible future observational physics. Stating that it will be a good resource for all physicists interested in these issues, the authors also said that they are going to update their work over the years.

One of the greybody factor results is shown in the figure below:




MCQST2021 | The universe as a quantum many-body system (Daniele Oriti) by Daniele Oriti
By JOSH HOFFMAN • Mar. 25, 2022 @ 01:28 GMT

The universe as a quantum many-body system

Speaker: Daniele Oriti | LMU München & MCQST



Abstract

Several approaches to quantum gravity suggest that spacetime and geometry are emergent from non-spatiotemporal quantum structures. In some of them, the fundamental quantum entities admit (in some approximation) a simplicial geometric description and can be mapped to generalized tensor networks. This allows also for a primitive entanglement/geometry correspondence. I summarize this formulation of the universe as a quantum many-body system, these immediate consequences as well as more recent results about holographic behavior. Then, I suggest possible lines of further developments from this perspective. Finally, I discuss how the hydrodynamic description of the same system, treated as a quantum fluid, can be given a cosmological interpretation and present a number of recent results about the resulting effective cosmological dynamics, including the replacement of the big bang singularity with a quantum bounce and a late-time accelerated behavior reproducing a phantom-like dark energy from pure quantum gravity origin.



Keywords: #Consciousness #Intelligence #Oriti #Quantum #Quantum_Gravity


The stochastic thermodynamics of computation David Wolpert Santa Fe Institute by David Wolpert
By DAVID WOLPERT • Mar. 25, 2022 @ 01:20 GMT

Colloquium Virtual Complexity at C3-UNAM

Universities for Science Consortium



Title: The stochastic thermodynamics of computation



David H. Wolpert

Santa Fe Institute



Abstract: One of the major resource requirements of computers—ranging from biological cells to human brains to high-performance digital computers—is the energy used to run them. Those energy requirements of performing a computation have been a long-standing focus of research in statistical physics, going back (at least) to the early work of Landauer and colleagues.



However, one of the most prominent aspects of computers is that they are inherently non-equilibrium systems. They are also often quite small, far from the thermodynamic limit. Unfortunately, the research by Landauer and co-workers was grounded in the statistical physics of the 20th century, which could not properly address the thermodynamics of non-equilibrium, nanoscale systems.



Fortunately, recent revolutionary breakthroughs in stochastic thermodynamics have overcome the limitations of 20th century statistical physics. We can now analyze arbitrarily off-equilibrium systems, of arbitrary size. Here I show how to apply these recent breakthroughs to analyze the thermodynamics of computation. Specifically, I present formulas for the thermodynamic costs of implementing (loop-free) digital circuits, of implementing Turing machines, and of implementing multipartite processes like the interacting organelles in a cell.







Keywords: #Intelligence #Consciousness #Wolpert #Thermodynamics


Webinário Física Quântica - Energy quantum helps - Prof. Gerardo Adesso University of Nottingham, UK by Gerardo Adesso
By GERARDO ADESSO • Mar. 25, 2022 @ 01:14 GMT



Keywords: #Intelligence #Consciousness #Adesso #Quantum #Quantum_Mechanics #Quantum_Information

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