a-auer/qiskit

A Jupyter notebook that demonstrates the use of Qiskit and the IBM Q Experience using the BBPSSW protocol for entanglement purification as an example.

qiskit's Issues

Add a license to the repository

I recently came across your project qiskit and I noticed that the repository github.com/a-auer/qiskit currently does not have a license specified.

Why Adding a License is Important?

As GitHub documents

Public repositories on GitHub are often used to share open source software. For your repository to truly be open source, you'll need to license it so that others are free to use, change, and distribute the software.

Would be possible to add a valid license to this repository? Probably something really OpenSource such as the Apache 2.0 license would fit really well.

Thanks!

EntanglementPurification doesn't run part 5.3 properly

When I try to run the last part of the code, it won't let me run it on an IBMQ device. It gives the following error message:

IBMQJobFailureError Traceback (most recent call last)
in
16 random_idx = np.random.randint(12)
17 job_dict = execute_purification(fidelity, random_idx, ibmq_device, shots=512)
---> 18 rho_fit = rho_from_dict(job_dict, cond_tomo=False)
19 fitted_states.append(rho_fit)
20

in rho_from_dict(job_dict, cond_tomo)
194 else:
195 # Regular quantum state tomography
--> 196 rho_fit = StateTomographyFitter(job_dict["job"].result(), job_dict["circuits"]).fit()
197
198 return rho_fit

~\Anaconda3\envs\dev_qiskit\lib\site-packages\qiskit\providers\ibmq\job\ibmqjob.py in result(self, timeout, wait, partial, refresh)
247
248 if self._status is JobStatus.ERROR and not partial:
--> 249 raise IBMQJobFailureError('Unable to retrieve job result. Job has failed. '
250 'Use job.error_message() to get more details.')
251

IBMQJobFailureError: 'Unable to retrieve job result. Job has failed. Use job.error_message() to get more details.'

With this being the error given by IMBQ: Qubit measurement is followed by instructions [7006]

Is there a way this can be solved? Or is it not possible to do this on a device as the measurement must happen before the last Hadamard gates?

New figure to depict basic purification idea

Should be figure "1a", two qubit pairs with $F$ result in one qubit apir with $F'$.

Recheck Part IV after new function definitions

Everywhere same number of shots

The + operator is no longer supported by QuantumCircuit

In Section 2.3.6, the plus is used to concatenate circuits, altough this is no longer supported.

• and += operators are no longer defined for QuantumCircuit.
  Instead, you can use the & and &= operators respectively, which use QuantumCircuit.compose().

Implement basis_gates

Implement basis_gates and describe what they are

Polish new parts of Sec. 3.2.1 Definition of Auxiliary Functions

Most of it is polished, only new passages need to be checked.