How do you write a simple program for a D-Wave device?
Posted: Tue Jul 18, 2023 12:04 pm
To write a simple program for a D-Wave device, you can use the D-Wave Ocean software development kit (SDK), which provides the necessary tools and libraries for interacting with D-Wave quantum computers. Here's a step-by-step guide to writing a simple program:
Install the D-Wave Ocean SDK: Start by installing the D-Wave Ocean SDK, which includes the necessary libraries and tools for programming D-Wave devices. Detailed installation instructions can be found in the official documentation provided by D-Wave Systems.
Import the required modules: In your Python program, import the required modules from the D-Wave Ocean SDK. These typically include dwave.cloud for connecting to the D-Wave cloud services, and dimod for defining and working with binary quadratic models.
Connect to the D-Wave cloud: Establish a connection to the D-Wave cloud service using your D-Wave API token. This token can be obtained by signing up for an account on the D-Wave Leap platform. Replace 'YOUR_API_TOKEN' with your actual API token
Define the problem: The D-Wave quantum computer solves optimization problems, specifically binary quadratic models. Define your problem as a binary quadratic model using the dimod library. This involves specifying variables, their biases, and interactions.
In this example, we have two variables 'x' and 'y', with biases of -1 and 2 respectively. The interaction between 'x' and 'y' is set to 3.
Submit the problem to the D-Wave solver: Use the D-Wave cloud client to submit the problem to a D-Wave solver. Choose the desired solver based on your requirements and the available resources. The solver's name can be obtained from the D-Wave Leap platform.
Retrieve the results: Once the problem has been solved by the D-Wave solver, retrieve the results. This includes the best solution and its associated energy.
This code retrieves the best solution found and its corresponding energy value.
That's it! You have written a simple program to solve an optimization problem using a D-Wave quantum computer. You can further customize your program, explore different problem formulations, and leverage additional features provided by the D-Wave Ocean SDK.
Install the D-Wave Ocean SDK: Start by installing the D-Wave Ocean SDK, which includes the necessary libraries and tools for programming D-Wave devices. Detailed installation instructions can be found in the official documentation provided by D-Wave Systems.
Import the required modules: In your Python program, import the required modules from the D-Wave Ocean SDK. These typically include dwave.cloud for connecting to the D-Wave cloud services, and dimod for defining and working with binary quadratic models.
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from dwave.cloud import Client
import dimod
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# Establish a connection to the D-Wave cloud
client = Client.from_config(token='YOUR_API_TOKEN')
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# Define the problem as a binary quadratic model
bqm = dimod.BinaryQuadraticModel({'x': -1, 'y': 2}, {('x', 'y'): 3}, 0.0, dimod.BINARY)
Submit the problem to the D-Wave solver: Use the D-Wave cloud client to submit the problem to a D-Wave solver. Choose the desired solver based on your requirements and the available resources. The solver's name can be obtained from the D-Wave Leap platform.
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# Submit the problem to a D-Wave solver
solver = client.get_solver()
response = client.submit(bqm, solver)
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# Retrieve the results
best_solution = next(response.samples())
energy = response.data_vectors['energy'][0]
print("Best Solution:", best_solution)
print("Energy:", energy)
That's it! You have written a simple program to solve an optimization problem using a D-Wave quantum computer. You can further customize your program, explore different problem formulations, and leverage additional features provided by the D-Wave Ocean SDK.