x86 Paging Tutorial Linux kernel usage Updated 2025-07-16
The Linux kernel makes extensive usage of the paging features of x86 to allow fast process switches with small data fragmentation.
There are also however some features that the Linux kernel might not use, either because they are only for backwards compatibility, or because the Linux devs didn't feel it was worth it yet.
Poisson's equation Updated 2025-07-16
Generalization of Laplace's equation where the value is not necessarily 0.
WikiLeaks Updated 2025-07-16
God Updated 2025-07-16
Saint Updated 2025-07-16
Ultra-high-energy cosmic ray Updated 2025-07-16
Sometimes it feels like this could be how we finally make experiments to see what the theory of everything looks like, a bit like the first high energy experiments were from less exotic cosmic rays.
Brain scanning Updated 2025-07-16
Likely implies whole brain emulation and therefore AGI.
Convolution Updated 2025-07-16
E. Coli strain Updated 2025-07-16
Reference strain: E. Coli K-12 MG1655.
List of religions Updated 2025-07-16
Sexual reproduction Updated 2025-07-16
Solvay Conference Updated 2025-07-16
Egg Updated 2025-07-16
Internationalism Updated 2025-07-16
Arm on tracks Updated 2025-07-16
"Arm on tracks" refers to a variant of the robotic arm robot form factor in which the position of attachment of the robotic arm can also be moved around linearly or with more degrees of freedom.
Television Updated 2025-07-16
Overfitting Updated 2025-07-16
Superconducting quantum computing Updated 2025-07-16
Philosophically, superconducting qubits are good because superconductivity is macroscopic.
It is fun to see that the representation of information in the QC basically uses an LC circuit, which is a very classical resonator circuit.
As mentioned at en.wikipedia.org/wiki/Superconducting_quantum_computing#Qubit_archetypes there are actually a few different types of superconducting qubits:
- flux
- charge
- phase
Input:
Quantum Computing with Superconducting Qubits by Alexandre Blais (2012)
Source. - youtu.be/uPw9nkJAwDY?t=293 superconducting qubits are good because superconductivity is macroscopic. Explains how in non superconducting metal, each electron moves separatelly, and can hit atoms and leak vibration/photos, which lead to observation and quantum error
- youtu.be/uPw9nkJAwDY?t=429 made of aluminium
- youtu.be/uPw9nkJAwDY?t=432 shows the circuit diagram, and notes that the thing is basically a LC circuitusing the newly created just now Ciro's ASCII art circuit diagram notation. Note that the block on the right is a SQUID device.
+-----+ | | | +-+-+ | | | C X X | | | | +-+-+ | | +-----+ - youtu.be/uPw9nkJAwDY?t=471 mentions that the frequency between states 0 and 1 is chosen to be 6 GHz:This explains why we need to go to much lower temperatures than simply the superconducting temperature of aluminum!
- higher frequencies would be harder/more expensive to generate
- lower frequencies would mean less energy according to the Planck relation. And less energy means that thermal energy would matter more, and introduce more noise.6 GHz is aboutFrom the definition of the Boltzmann constant, the temperature which has that average energe of particles is of the order of:
- youtu.be/xjlGL4Mvq7A?t=138 superconducting quantum computer need non-linear components (too brief if you don't know what he means in advance)
- youtu.be/xjlGL4Mvq7A?t=169 quantum computing is hard because we want long coherence but fast control
Where 2 Technologies Updated 2025-07-16
Spacetime symmetry Updated 2025-07-16
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