# Questions tagged [d-wave]

A quantum computing company, based in Burnaby, British Columbia, Canada, mostly known for their quantum annealing computers. An early rendition of these, D-Wave One, was the first commercially available quantum computer. (Wikipedia)

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### Performance of quantum annealing systems vs gate based ones

Quantum annealers like D-Wave can be used to solve Quadratic Unconstrained Binary Optimization (QUBO) which is a NP Hard problem (see here) while gate based quantum computers, like the ones created by ...
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### Solving KnapSack problem on D Wave hybrid CQM

I am solving 01 KnapSack problem for 500k items with the help of hybrid CQM solver of D Wave. And for comparison I solved same problem with CPLEX. Solution quality of CPLEX solver is better than D-...
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### Multiplying two real variables in D Wave

I have two real variables from dimod: from dimod import Real A = Real("A") B = Real("B") However, when I try to multiply them ...
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### D-Wave hybrid solver

I am interested in using the D-Wave CQM hybrid solver for solving the job shop problem. I would like to get more information about the internal working of this solver but I have been unable to find ...
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### How to add expressions to a Binary Quadratic Model, similar to CQM?

In a constrained quadratic model, we are able to create expressions like this: ...
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### Who is currently working on coherent Ising machines (classical analog devices)?

Can you share some papers on that subject? Review papers would be highly appreciated. What are limitations in terms of connectivity between different spins?
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### Comparing BQM and CQM solving for a tree-path problem

I'm currently working on a project for my thesis regarding BQM and CQM optimisation for a path problem. Without going too much on the details, here's some info: the structure is a tree, where all the ...
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### Can D-Wave presently solve real-world problems that conventional computers cannot solve?

There are number of threads on this site about the ability of QCs solving real-world problems (see for example What are the practical applications of quantum computing in engineering by the year 2030?,...
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### QPU vs. Solvers

I am trying to understand the roles of the QPU and the solvers in a quantum device, specifically I am reading for this purpose the documentation of D-Wave. While it is clear to me that the QPU of a ...
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### Does the D-Wave hardware show any advantage for academic use-cases, for example in condensed matter physics?

The D-Wave team put out a few papers (like this one and this one) in the last few years describing how their methods can find ground states of certain spin-glass Hamiltonians faster than classical ...
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### Did D-Wave show quantum advantage in 2023?

I would like to know your thoughts on whether or not D-Wave has shown a a smoking-gun example of quantum advantage this year. I am genuinely not quite sure what to think, but I believe the answer to ...
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### Python code for D-Wave Annealer

In the below screenshot, I am aware of resolving the issue by reducing num_reads as the annealing time is exceeding my allowance. Although it works, my question ...
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### Is there any another method for adjusting transverse field? (D'wave)

By using QUBO formula, I can't take in Transverse field equation I was tried using of annealing schedule but it was failed . Is there any another method for adjusting transverse field? (I want to get ...
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### How to use D-Wave decomposers?

I'm currently trying to work on a minimization problem using D-Wave hybrid and quantum machines. The problem is, shortly, an energy optimization for a network of switches and servers, linked as a ...
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### How can I exactly solve a Quadratic Model with integer variables using DWave Ocean classical solvers?

As an example, let's consider the following simple QuadraticModel problem with just 3 INTEGER variables: ...
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### How to keep the initial Hamiltonian in D Wave

So the D wave machine claims to start in an eigenstate of the Pauli X term in the transverse Ising model Hamiltonian, $$-\frac{A(s)}{2}\sum_{i} \sigma^{x}_{i}$$ and then $A(s)$ is turned off slowly ...
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### Is there any quantum annealer simulator offered by DWave?

I am searching for quantum annealer simulator offered by DWave. I found classical solvers in dimod packages that implement simulated annealing, but I couldn’t find solver that simulates the real ...
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### D-Wave Cloud Service - Pricing for Academic Research Project

In D-wave's web portal, I found 3 different ways that one can gain access to more QPU/Hybrid Solver time. One of them is the academic research project. Does anyone here have experience of carrying out ...
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### How to compare Quantum Annealing and Adiabatic Quantum Computing?

I'm still unsure on the difference between adiabatic quantum computing (AQC) and quantum annealing (QA). Please critique these interpretations: AQC: Define a Hamiltonian with an easy-to-prepare ...
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### Absolute value of a BQM: how to substitute it with constraint?

I need to build an expression for the objective to be minimized which is based on the L1-norm. For doing this, I need to take the absolute value of a BQM, which is not possible, at least at the moment ...
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### How to add constraints to a BQM?

BQM is unconstrained by definition. I need to submit a knapsack problem with two constraints (equality constraints + inequality constraints) to a quantum annealer (DWaveSampler). How would you set the ...
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### Why does method to_bqm not maintain variables order?

When converting to bqm with .compile().to_bqm(), the original order of the variables is not maintained. To reproduce: ...
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### What arguments point towards D-Wave devices being potentially useful?

I'm looking for any evidence pointing towards D-Wave's approach to quantum computation being promising to achieve any sort of computational advantage with respect to classical devices. Note that I'm ...
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