Quantum Bayesian Networks

March 22, 2016

First version of Qubiter (a quantum computer simulator) is out. It says: “Welcome, my navigator. Where do you want me to take you next?”

Filed under: Uncategorized — rrtucci @ 4:44 pm

artiste-qb.net has just uploaded at GitHub its first version of Qubiter, a quantum computer simulator, under the BSD license and written in Python.

It’s saying to you: “Welcome, Navigator. Where do you want me to take you next?”



Over the last 20 years, dozens of quantum computer simulators (for gate model, aka quantum circuit QC) have been released. Here is a partial list. So what makes this one special?

Let me compare Qubiter with Microsoft’s very famous quantum simulator called Liqui|>.

  • Liqui|> is closed source (and heavily patented), Qubiter is open source under BSD license
  • Liqui|> is written in F#, Qubiter is written in Python. User base of Python is ~ 100 times bigger than that of F#. And believe me, programmers are very savvy consumers of programming languages.
  • Dave Wecker (rhymes with wrecker), chief architect of Liqui|> , has been quoted as saying that he estimates Liqui|> has about 30,000 lines of code. Qubiter currently has less than a 1000, and does all the basics and much more. So tell me, what would you prefer to have to grok, 30,000 or 1,000 lines of code?

I hope you enjoy it. Or as my grandma used to say,

Stai zitto e mangia!!



  1. Very happy to see how this turned out! Flows all very naturally in Python.

    Comment by Quax — March 23, 2016 @ 2:50 am

  2. Thanks Quax. Numpy support for tensors is very good, and tensor products are ubiquitous in quantum mechanics, so I agree, Python is a natural for a QC simulator.

    Comment by rrtucci — March 23, 2016 @ 3:30 am

  3. It’s okay. They are writing software that is specific to their platform. My software is more platform independent. Besides, my software is better😉 and open source and in Python, all good selling points.

    Other advantages we have, in my opinion:

    we are a real company, not a bunch of academics trying to do a business on the side,

    we do only software, not both software and hardware like them

    Comment by rrtucci — March 27, 2016 @ 4:27 am

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