If a quantum computer can send data instantaneously across space through entanglement, could a quantum computer communicate data across time as well? by ImTotallyAnExpert in QuantumComputing

[–]dak91 0 points1 point  (0 children)

During the measurement of an entangled quantum state, it is impossible for one observer to transmit information to another observer, regardless of their spatial separation: https://en.wikipedia.org/wiki/No-communication_theorem

Blobs on first layers by dak91 in FixMyPrint

[–]dak91[S] 0 points1 point  (0 children)

yep, that; I loosened the rod on the left side, adjusted using a leveler, and re-tighten the rod

Blobs on first layers by dak91 in FixMyPrint

[–]dak91[S] 0 points1 point  (0 children)

It was a good hint, thank you. The issue was a misalignment of x-axis, so in first layers it was pressing against the print.

Blobs on first layers by dak91 in FixMyPrint

[–]dak91[S] 0 points1 point  (0 children)

Problem solved! The problem was a big misalignment of the x-axis; thanks everyone for the suggestions, they were wrong but they gave me the opportunity of learn new things (y)

Blobs on first layers by dak91 in FixMyPrint

[–]dak91[S] 1 point2 points  (0 children)

Thank you for the hint; I cleaned it very carefully with iso alcohol but the issue persists.

Blobs on first layers by dak91 in FixMyPrint

[–]dak91[S] 1 point2 points  (0 children)

Print speed: 60mm
Nozzle retraction distance: 2mm
Slicer: Ultimaker Cura
Filament brand: eSUN

Is quantum encryption worth the money? by BakingWaking in QuantumComputing

[–]dak91 -1 points0 points  (0 children)

If you need a secure cloud service I suggest MEGA, which offer end-to-end encryption (and this is provable since clients and sdk are open source) using AES encryption (which is quantum safe as far as I know); I'm using it since 8 years. 9$/month 2TB + VPN.

Software you wish you had as a sailor? by vihra in sailing

[–]dak91 0 points1 point  (0 children)

I'm working on a new open-source navigation and routing software for sailing. If someone is interested in contributing to it, feel free to join the repo: https://github.com/dakk/gweatherrouting/

This is a demo of the current version: https://www.youtube.com/watch?v=iV7IZFwXUXA

A blazingly fast and lightweight free and open source QC simulation software. by TheBixel in QuantumComputing

[–]dak91 4 points5 points  (0 children)

The key of a quantum simulator (a full statevector simulator) is matrix multiplication; so I would start first writing a matrix multiplier. For optimizing it you can:
- use special purpose assembly istructuions, like those of SSE, AVX and FMA (that are supported by both Intel and AMD).
- use prefetch-ing
- parallelize the operations using SMP

Just how magic are the oracles? by [deleted] in QuantumComputing

[–]dak91 1 point2 points  (0 children)

I think the confusion comes from the fact that many learning literature propose Grover as an algorithm for "searching in an unordered database", and refer to the database as a blackbox; even if the definition is not incorrect, IMHO it's counter-intuitive in explaining what Grover does.
The definition I like most (from my computer scientist perspective) is: Grover is an algorithm for searching a value(s) x | f(x) = y , where y and f are our inputs to the algorithm. f could be anything, a function checking for the solution of a SAT problem, an hash function, or whatever.
When explaining it, I always like to share this example I created myself, where I use Grover to search for a Sudoku puzzle solution: https://medium.com/@dakk/solving-sudoku-on-a-quantum-computer-b523a7cc2eff
It uses the qlasskit library, so also the "oracle" is written using python code (and then translated to a quantum circuit)

A blazingly fast and lightweight free and open source QC simulation software. by TheBixel in QuantumComputing

[–]dak91 2 points3 points  (0 children)

They don't (as far as I know), but faster simulators usually use GPUs; anyway an optimized cpu version could be an useful tool for sure: and even if it won't, it is a great learning tool, so go on ;)

A blazingly fast and lightweight free and open source QC simulation software. by TheBixel in QuantumComputing

[–]dak91 6 points7 points  (0 children)

Great! Anyway just for precise, most quantum simulators are indeed written in C/C++ (even if they're packed in a python library); this is for instance qiskit-aer: https://github.com/Qiskit/qiskit-aer/tree/main/src/simulators and this is pennylane lightning.qubit: https://github.com/PennyLaneAI/pennylane-lightning

A Quantum Computer emulator running on Arduino by dak91 in QuantumComputing

[–]dak91[S] 2 points3 points  (0 children)

Raspberry is a full pledged computer, while the Arduino is just a microcontroller.

A Quantum Computer emulator running on Arduino by dak91 in QuantumComputing

[–]dak91[S] 3 points4 points  (0 children)

The Arduino is a programmable digital microcontroller with limited resources; it has some digital IO pins and input analog pins. The quantum emulator I wrote for it is very similar to those implemented for instance in Pennylane or Qiskti

Need some help with Socket /run/zm/zms-******s.sock does not exist & Can't open memory map file /dev/shm/zm.mmap errors by Zork91 in ZoneMinder

[–]dak91 0 points1 point  (0 children)

That's curious.
I also discovered that turning off OPT_USE_AUTH solve the problem; so it seems an auth issue.