TypeError: 'NoneType' object is not subscriptable when using IBM QE

[michaelrgeller]

I'm using Python 3.6.0 and the latest source code from master.

In the examples folder, running quantum_random_numbers.py gives
(Note: This is the (slow) Python simulator.)
Measured: 0

Now try to use the IBM backend. Running quantum_random_numbers_ibm.py gives

IBM QE user (e-mail) > mgeller@uga.edu
IBM QE password > x

I enter the login information, and receive an email message:

Hi mgeller@uga.edu,

Sorry, the results of the execution of your quantum score projectq_experiment failed.

You can see the experiment code accessing to the next link:

https://quantumexperience.ng.bluemix.net/qstage/#/editor?codeId=7f838b4658f61d1d805cb31f584a5552
Thank you in advance for your help making IBM’s quantum presence on the web as exciting and cool as possible,

Sincerely,

the IBM Quantum Team

The link points to a picture of the quantum circuit that looks correct.
After a minute or so, I get the error

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/backends/_ibm/_ibm.py", line 232, in _run
data = res['data']['p']
TypeError: 'NoneType' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "quantum_random_numbers_ibm.py", line 18, in
eng.flush()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_main.py", line 229, in flush
self.receive([Command(self, FlushGate(), ([WeakQubitRef(self, -1)],))])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_main.py", line 214, in receive
self.send(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send
self.next_engine.receive(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_tagremover.py", line 56, in receive
self.send([cmd])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send
self.next_engine.receive(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_optimize.py", line 234, in receive
self.send([cmd])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send
self.next_engine.receive(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_replacer/_replacer.py", line 190, in receive
self.send([cmd])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send
self.next_engine.receive(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_tagremover.py", line 56, in receive
self.send([cmd])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send
self.next_engine.receive(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_ibmcnotmapper.py", line 194, in receive
self._run()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_ibmcnotmapper.py", line 147, in _run
self.next_engine.receive([cmd])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_optimize.py", line 234, in receive
self.send([cmd])
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send
self.next_engine.receive(command_list)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/backends/_ibm/_ibm.py", line 275, in receive
self._run()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/backends/_ibm/_ibm.py", line 262, in _run
raise Exception("Failed to run the circuit. Aborting.")
Exception: Failed to run the circuit. Aborting.

I also found same issue with the pip installed version.

Any advice would be appreciated.

[thomashaener]

Hi! To me it looks like the pip-installed version is running. Have you tried upgrading that to the newest version as well? If so, please make sure you have enough credits on your quantum experience account.

[damiansteiger]

Did you get it working? @michaelrgeller

[michaelrgeller]

I tried it again, installing both from source and pip, and still get the same problem. Unfortunately I don’t have much time to spend on this now because I think it is really interesting. Anyhow, here is what happens. First uninstall and delete previous versions. Then pip install projectq Collecting projectq Using cached projectq-0.1.3.tar.gz Requirement already satisfied: numpy in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from projectq) Requirement already satisfied: future in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from projectq) Requirement already satisfied: pytest>=3.0 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from projectq) Requirement already satisfied: pybind11>=1.7 in /Users/mgeller/Library/Python/2.7/lib/python/site-packages (from projectq) Requirement already satisfied: requests in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from projectq) Requirement already satisfied: py>=1.4.29 in /Users/mgeller/Library/Python/2.7/lib/python/site-packages (from pytest>=3.0->projectq) Requirement already satisfied: setuptools in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from pytest>=3.0->projectq) Requirement already satisfied: six>=1.10.0 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from setuptools->pytest>=3.0->projectq) Requirement already satisfied: appdirs>=1.4.0 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from setuptools->pytest>=3.0->projectq) Requirement already satisfied: packaging>=16.8 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from setuptools->pytest>=3.0->projectq) Requirement already satisfied: pyparsing in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from packaging>=16.8->setuptools->pytest>=3.0->projectq) Installing collected packages: projectq Running setup.py install for projectq ... done Successfully installed projectq-0.1.3 pip list projectq (0.1.3) Here’s the script: import projectq.setups.ibm from projectq.ops import H, Measure from projectq import MainEngine from projectq.backends import IBMBackend eng = MainEngine() q1 = eng.allocate_qubit() H | q1 Measure | q1 eng.flush() print("Measured: {}".format(int(q1))) python3 projectq_test.py gives (Note: This is the (slow) Python simulator.) Measured: 0 Seems fine. Now try eng = MainEngine(IBMBackend()) q1 = eng.allocate_qubit() H | q1 Measure | q1 eng.flush() print("Measured: {}".format(int(q1))) python3 projectq_test.py gives IBM QE user (e-mail) > mgeller@uga.edu IBM QE password > After ~2 minutes, Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/backends/_ibm/_ibm.py", line 232, in _run data = res['data']['p'] TypeError: 'NoneType' object is not subscriptable During handling of the above exception, another exception occurred: Traceback (most recent call last): File "projectq_test.py", line 57, in <module> eng.flush() File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_main.py", line 229, in flush self.receive([Command(self, FlushGate(), ([WeakQubitRef(self, -1)],))]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_main.py", line 214, in receive self.send(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send self.next_engine.receive(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_tagremover.py", line 56, in receive self.send([cmd]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send self.next_engine.receive(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_optimize.py", line 234, in receive self.send([cmd]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send self.next_engine.receive(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_replacer/_replacer.py", line 190, in receive self.send([cmd]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send self.next_engine.receive(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_tagremover.py", line 56, in receive self.send([cmd]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send self.next_engine.receive(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_ibmcnotmapper.py", line 194, in receive self._run() File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_ibmcnotmapper.py", line 147, in _run self.next_engine.receive([cmd]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_optimize.py", line 234, in receive self.send([cmd]) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/cengines/_basics.py", line 191, in send self.next_engine.receive(command_list) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/backends/_ibm/_ibm.py", line 275, in receive self._run() File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/projectq/backends/_ibm/_ibm.py", line 262, in _run raise Exception("Failed to run the circuit. Aborting.") Exception: Failed to run the circuit. Aborting. And I get the email: Hi mgeller@uga.edu, Sorry, the results of the execution of your quantum score projectq_experiment failed. You can see the experiment code accessing to the next link: https://quantumexperience.ng.bluemix.net/qstage/#/editor?codeId=03b5383fc63af77086181836664580f0 Thank you in advance for your help making IBM’s quantum presence on the web as exciting and cool as possible, Sincerely, the IBM Quantum Team

…

On Wed, Feb 1, 2017 at 2:51 PM, damiansteiger ***@***.***> wrote: Did you get it working? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#10 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ANqFeySdAHFmWw7y_Lk0g9Dp9O9IUUY1ks5rYOIpgaJpZM4LrzhO> .

[thomashaener]

Thank you for trying again!
It seems that you installed the new version of ProjectQ for python2.7, but you're running your script using python3.6. Please, try executing
python2.7 projectq_test.py
instead or reinstalling using pip3 instead of pip.

Also, you can check that you have the newest version of ProjectQ (0.1.3) as follows:

import projectq
projectq.__version__