Hybrid Quantum-Classical application tutorial

[KevinR_Intel]

Look for upcoming sessions of introductions to the features and programming applications with the Intel® Quantum SDK.

Attached are updated versions an example of a hybrid quantum-classical application, a variational quantum eigensolver. It contains the essential components of processing information in both classic bit representation and quantum qubit representation.

This example solves a single matrix, but can be extended with the Intel® Hybrid Quantum-Classical library https://github.com/IntelLabs/Hybrid-Quantum-Classical-Library  to treat arbitrary matrices.

[joshdumo]

Hi,

I am trying out the example and am getting an error when running the executable simple_vqe, something about GLIBC.

Please assist.

[KevinR_Intel]

Hi Josh,

It's because you're trying to run on the login node. The login node is only there to provide communication and access to the job queue.

To use the compile_and_run.txt as a job script, put it in the same directory as simple_vqe.cpp, remove the '.txt' suffix, and type

qsub compile_and_run

The 'qsub' command submits the "job script" to the machine and when it's turn in the queue comes, your job runs. If you read compile_and_run, it is basically just the sequence of things you would have typed if you had done then yourself on the Command-Line-Interface.

The output of your job will be in the file 'initial_test.oNNNN' where the NNN's are the number of your job in the total queue. Alternatively, you can also modify the source code to write out any data you'd like to preserve.

[joshdumo]

Thank you for the prompt assist.

Previously I was running "qsub compile_and_run_vqe.txt" still with the suffix attached.

I then followed the correct outlined procedure but still i get no output, instead getting 'No such process'. Please find attached the screenshot.

[KevinR_Intel]

I omitted a step in explaining how to modify the .txt to become a job file, and that may be causing the error. Try changing the first line of the script to

#!/bin/bash

i.e., remove 1 "#".

Adding an extra # was necessary because the forum wants to protect you from downloading a potentially-immediately dangerous file, and considers bash scripts to be to ready-to-go.

Also check to make sure that the end of the compile_and_run_vqe has the lines

# move to the directory run the executable
cd vqe_outputs/
./simple_vqe

[joshdumo]

Hi Kevin,

I have tried running with the updated simple_vqe and compile_and_run_vqe. This time the compilation has errors. Please see screenshot and attached job output.

[KevinR_Intel]

That simple_vqe.cpp was stale--it used the beta version API calls and that is what the compiler is (rightly) complaining about. That is my mistake; I've uploaded an updated version that is consistent with version 1.0.

TLDR:  I uploaded the .cpp file from the wrong directory.

[joshdumo]

Hi Kevin,

The updated version runs as expected. Thank you very much for the support!