quantum on Dan MacKinlayhttps://danmackinlay.name/tags/quantum.htmlRecent content in quantum on Dan MacKinlayHugo -- gohugo.ioen-usThu, 26 May 2022 09:52:30 +1000Emergent spacetimehttps://danmackinlay.name/notebook/emergent_spacetime.htmlThu, 26 May 2022 09:52:30 +1000https://danmackinlay.name/notebook/emergent_spacetime.htmlReferences I know nothing of this but I run across oblique analogies to graph NNs and so I note some pop sci pieces here:
A quantum origin for spacetime One Lab’s Quest to Build Space-Time Out of Quantum Particles | Quanta Magazine A Physicist’s Physicist Ponders the Nature of Reality | Quanta Magazine References Cao, ChunJun, and Sean M. Carroll. 2018. “Bulk Entanglement Gravity Without a Boundary: Towards Finding Einstein’s Equation in Hilbert Space.This is a simulationhttps://danmackinlay.name/notebook/this_is_a_simulation.htmlSat, 09 Apr 2022 15:32:42 +0800https://danmackinlay.name/notebook/this_is_a_simulation.htmlAre we living in a simulation? Conspiracies as simulation Limits to knowledge Incoming References Bekenstein limits, (quantum) information theory and physics, dreams in the minds of gods etc…
Are we living in a simulation? Scott Aaronson, Your yearly dose of is-the-universe-a-simulation:
[…] to whatever extent we believe the Bekenstein bound […] we believe that in quantum gravity, any bounded physical system (with a short-wavelength cutoff, yada yada) lives in a Hilbert space of a finite number of qubits, perhaps \(~10^69\) qubits per square meter of surface area.Quantum computinghttps://danmackinlay.name/notebook/quantum_computing.htmlFri, 21 Jan 2022 14:33:08 +1100https://danmackinlay.name/notebook/quantum_computing.htmlTopical Courses Emulations, languages, trial runs References Nothing to see yet apart from some links I myself don’t have time to inspect.
Topical Scott Aaronsons’s Quantum supremacy FAQ, What Google’s Quantum Supremacy Claim Means for Quantum Computing Preskill on quantum supremacy Stephen Jordan’s Quantum Algorithm Zoo Courses Scott Aaronsons’s his lecture notes on quantum computing now available as preprint textbook
His introduction also has some useful leads:
I don’t pretend that these notes break any new ground.Quantum information in physicshttps://danmackinlay.name/notebook/quantum_information.htmlThu, 14 Dec 2017 16:26:26 +1100https://danmackinlay.name/notebook/quantum_information.htmlI would like to understand this more deeply, through following up the references in this piece:
Scott Aaronson, Is “information is physical” contentful?
“Information is physical.”
This slogan seems to have originated around 1991 with Rolf Landauer. […] There are many things it’s taken to mean, in my experience, that don’t make a lot of sense when you think about them-- or else they’re vacuously true, or purely a matter of perspective, or not faithful readings of the slogan’s words.Quantum probabilityhttps://danmackinlay.name/notebook/quantum_probability.htmlMon, 18 Sep 2017 09:17:12 +1000https://danmackinlay.name/notebook/quantum_probability.htmlReferences On real-valued classical probability as a special case of complex-valued quantum probability. More generally (?), non-commutative probability.
Chaitanya Rao, Notes on von Neumann’s algebra formulation of Quantum Mechanics has a side-by-side comparison table, and a reading list for getting up to speed fast.
David Ellerman On Classical and Quantum Logical Entropy: The analysis of measurement advertises an article on this theme.
Terry Tao, maximally general: Notes on Free probability.Quantum-probabilistic graphical modelshttps://danmackinlay.name/notebook/graphical_models_quantum.htmlMon, 07 Aug 2017 11:46:35 +1000https://danmackinlay.name/notebook/graphical_models_quantum.htmlReferences When you have quantum probability, directed graphical models look different, especially for causality. So I am told.
Jacques Pienaar, Causality in the quantum world:
In the case of two entangled particles, Reichenbach’s principle would suggest that the correlations between the particles could be explained by a common cause. However, we also know that quantum statistics can violate Bell’s inequalities, which means that variables serving as common causes that could make the correlation disappear cannot exist.Hidden variable formalisms in quantum mechanicshttps://danmackinlay.name/notebook/hidden_variable_qm.htmlSat, 28 Nov 2015 07:36:57 +0800https://danmackinlay.name/notebook/hidden_variable_qm.htmlReferences Loosely speaking, we can have quantum mechanics without randomness, driven by deterministic hidden values but then it has to be non-local. This is apparently Bell’s theorem
The most famous version is the De Broglie-Bohm formulation/ pilot-wave theory.
I’m reading about this because actually I’m thinking about the non quantum case; what difference does it make to assume that there is a deterministic variable underlying your apparently random one?