A Look At Quantum Computer Manufacturer D-Wave and Its Founder 96
First time accepted submitter tpjunkie writes "Many slashdot readers will remember D-wave's announcement in 2007 of its quantum computer, an announcement met with skepticism and a good amount of scorn. However, today the company has sold quantum computers to such companies as Lockheed Martin and Google, and their computers have gone from a handful of qubits to 512 in their most recent offerings. Nature has a story including an interview with the company's founder Geordi Rose, and a look at where the company is headed and some of the difficulties it has overcome."
Not a QC! (Score:5, Informative)
The summary is saying it is a quantum computer because it sold these to Lockheed Martin and Google. Please. stop that shit. They are pretty fast computers, however nobody has proven it is quantum computers. Even the CTO at D-Wave is not able to demonstrate it and he just doesn't care saying it is damn fast and that's all matter for him.
Slashdot should stop advertising D-Wave computers as QC until it has been proven.
”What we do is build computers,” Rose says, “and if we can build the fastest computers the world has ever known, you can call them whatever you like, and I’ll be happy.”
"Instead, journalists have preferred a paper released this week by Catherine McGeoch and Cong Wang, which reports that quantum annealing running on the D-Wave machine outperformed the CPLEX optimization package running on a classical computer by a factor of ~3600, on Ising spin problems involving 439 bits. Wow! That sounds awesome! But before rushing to press, let’s pause to ask ourselves: how can we reconcile this with the USC group’s result of no speedup?"
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Re:quantum computing (Score:5, Informative)
The research into quantum computing is using done with the goal of a universal quantum Turing machine, which would, by proof, run classical algorithms in addition to quantum ones.
Not the D-Wave. There's two branches in current quantum computation: General quantum computation, which is still stuck at the implementation stage (of which languages like QCL derive) and D-Wave's computation (which, admittedly, is geared toward quantum annealing and no other quantum procedures, and is therefore not a general quantum computer).
If I were to think a few years down the road, the path D-Wave is taking would culminate in chips that do specific things, such as perform quantum communication protocols, but only those things that were hardwired into the chip. It's hard to think of how a quantum operating system or a quantum programming language would operate under such a model. The general quantum computing path, for which four major quantum programming languages have been written already (QCL, LANQ, CQPL, and QML), if possible, would allow for Turing-Complete machines.
Re:Not a QC! (Score:5, Informative)
Transistors directly use quantum effects to work, yet we don't call desktop computers "quantum computers".
The transistors in the CPU in your desktop computer are IGFETs (insulated gate field effect transistors). The principle of operation of this device is that moving charge on the gate can enhance or deplete the number of mobile electrons in the source to drain channel under the gate and cause it to turn on or off using an electric field effect which is not considered a quantum effect.
To be fair, at the scales that modern transistors operate, there are some interesting quantum effects. Most are considered as "bad" (causing problems with the "classical" operation of the transistor by tunneling charge or changing thresholds), but there are a few things like strained silicon that are used to improve performance (which used to create quantum containment and effective mass modifications to make small geometry operation more feasible), but these quantum effects aren't intrinsic to the operation of a generic IGFET (just a FET that's really small).
There are of course stuff in your desktop computer that intrinsically rely on quantum effects to work. For example, the flash memory (uses tunneling to move charge in and out of an isolated control gate). However, there are many other things that are similar to the transistor's use of QM effects like the optical drive (solid state laser uses bandgaps to get a certain frequency) and the disc drive (uses the GMR effect which is related to QM electron spin transport), but that's really just to make stuff work when it is really small, not intrinsic to the operation.
In the end, it's all physics and computers use physics and when you make things really small the quantum nature of physics must be accounted for, but it can be taken advantage of too. As for calling a quantum adiabatic computer a "quantum computer" I agree that would be a no. It technically relies on tunneling, so it's sort of like a flash memory in that respect (it's basic theory of operation requires a non-classical QM effect which is different than a transistor).
As to whether D-Wave actually does or doesn't implement a QM adiabatic algorithm, or perhaps just uses QM tunneling to improve a more classical annealing implementation speed and result, and if that actually makes any practical difference, is another question.