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Hi I'm a newbie in quantum computing recently I had a look at the AWS braket and I've seen they had a machine called D-Wave - Advantage_system6.1 that has 5760 qubits but when I googled the highest qubits quantum computer so far it showed me IBM's 127-qubit Eagle processor is the most potent Quantum computer so far! How are IBM's 127 qubits more potent than the 5760 qubits D-Wave - Advantage_system6.1?

Also, should I learn Amazon braket or IBM quantum computing using Qiskit?

Thank you. sorry for my English.

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3 Answers 3

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They are different kinds of quantum computers:

The D-Wave is a quantum Annealer. A rather specific (non-general purpose) device that can solve QUBO-type problems.

IBM offers universal gate-based quantum computers. They can in principle solve everything the D-Wave can. But with this generality comes the downside of control.

As regards to your questions, you should learn depending on what problems do you want to solve.

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As the other answers have stated, they're two substantially different systems that are unfortunately both marketed as quantum computers.

D-Wave is more specifically a quantum annealer. At a high level, it works by encoding a function you'd like to optimize and the system will tend to the lowest possible energy state, which should correspond to the optimal solution to the problem. This makes it powerful for solving a particular class of problems. However, the 'quantum-ness' of a such a 'computer' is debatable. While it does utilize qubits to perform these calculations, these annealers don't utilize the uniquely quantum resources of superposition and entanglement.

IBM and others' quantum computers are what people generally mean when they use the term. They can perform gate-based algorithms on qubits that utilize superposition and entanglement to enable new algorithms like Shor's, Grover's, and more. These computers are much more general than quantum annealers, because they can run any classical algorithm as well as strictly quantum algorithms, but have also been much harder to scale.

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    $\begingroup$ Thank you for the great information. $\endgroup$
    – Zakaria Halloumi
    Commented May 14, 2022 at 22:37
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My understanding isn't as deep, but those are two different quantum hardware systems. IBMs system is a gate based one, akin to a normal CPU. The d-Wave one is a Quantum Annealing system, that isn't generally usable as well as needing a much higher number of qubits to do the same task.

This is a good read on the differences of both: https://www.quantumcomputinginc.com/blog/quantum-annealing-gate/

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