{"action":"closed","issue":{"url":"https://api.github.com/repos/QISKit/qiskit-sdk-py/issues/439","repository_url":"https://api.github.com/repos/QISKit/qiskit-sdk-py","labels_url":"https://api.github.com/repos/QISKit/qiskit-sdk-py/issues/439/labels{/name}","comments_url":"https://api.github.com/repos/QISKit/qiskit-sdk-py/issues/439/comments","events_url":"https://api.github.com/repos/QISKit/qiskit-sdk-py/issues/439/events","html_url":"https://github.com/QISKit/qiskit-sdk-py/issues/439","id":319173152,"number":439,"title":"Unexpected behaviour for ibmqx5","user":{"login":"decodoku","id":18051574,"avatar_url":"https://avatars0.githubusercontent.com/u/18051574?v=4","gravatar_id":"","url":"https://api.github.com/users/decodoku","html_url":"https://github.com/decodoku","followers_url":"https://api.github.com/users/decodoku/followers","following_url":"https://api.github.com/users/decodoku/following{/other_user}","gists_url":"https://api.github.com/users/decodoku/gists{/gist_id}","starred_url":"https://api.github.com/users/decodoku/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/decodoku/subscriptions","organizations_url":"https://api.github.com/users/decodoku/orgs","repos_url":"https://api.github.com/users/decodoku/repos","events_url":"https://api.github.com/users/decodoku/events{/privacy}","received_events_url":"https://api.github.com/users/decodoku/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":{"login":"hanheepaik","id":4256513,"avatar_url":"https://avatars2.githubusercontent.com/u/4256513?v=4","gravatar_id":"","url":"https://api.github.com/users/hanheepaik","html_url":"https://github.com/hanheepaik","followers_url":"https://api.github.com/users/hanheepaik/followers","following_url":"https://api.github.com/users/hanheepaik/following{/other_user}","gists_url":"https://api.github.com/users/hanheepaik/gists{/gist_id}","starred_url":"https://api.github.com/users/hanheepaik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hanheepaik/subscriptions","organizations_url":"https://api.github.com/users/hanheepaik/orgs","repos_url":"https://api.github.com/users/hanheepaik/repos","events_url":"https://api.github.com/users/hanheepaik/events{/privacy}","received_events_url":"https://api.github.com/users/hanheepaik/received_events","type":"User","site_admin":false},"assignees":[{"login":"hanheepaik","id":4256513,"avatar_url":"https://avatars2.githubusercontent.com/u/4256513?v=4","gravatar_id":"","url":"https://api.github.com/users/hanheepaik","html_url":"https://github.com/hanheepaik","followers_url":"https://api.github.com/users/hanheepaik/followers","following_url":"https://api.github.com/users/hanheepaik/following{/other_user}","gists_url":"https://api.github.com/users/hanheepaik/gists{/gist_id}","starred_url":"https://api.github.com/users/hanheepaik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hanheepaik/subscriptions","organizations_url":"https://api.github.com/users/hanheepaik/orgs","repos_url":"https://api.github.com/users/hanheepaik/repos","events_url":"https://api.github.com/users/hanheepaik/events{/privacy}","received_events_url":"https://api.github.com/users/hanheepaik/received_events","type":"User","site_admin":false}],"milestone":null,"comments":2,"created_at":"2018-05-01T11:10:57Z","updated_at":"2018-05-12T00:02:17Z","closed_at":"2018-05-12T00:02:16Z","author_association":"MEMBER","body":"Output for a repetition code run gives significantly different behaviour than expected.\r\n\r\n## Expected Behavior\r\nRepetition codes were run on *ibmqx5* with an encoded bit value of `0`. The output should be `0` on all qubits. Given noise levels and previous results, it can be expected that `1` will instead be output for each qubit for 10-20% of the samples. This is seen for codes of size d=3 to d=7 using the implementation [here](https://github.com/decodoku/repetition_code/blob/master/repetition_code.ipynb).\r\n\r\n## Current Behavior\r\nFor a d=8 code, it is found that some qubits output `1` for 50-80% of the samples. A comparison of recent runs showing the expected behaviour for d=7, and the unexpected behaviour for d=8, can be found [here](https://github.com/decodoku/Misc_QISKit_Things/blob/master/RepetitionCodeBug.ipynb).\r\n\r\n## Possible Solution\r\nIf this is noise, a solution is obviously outside the scope of the SDK. However, it could be that something strange is going on in the process of taking the QASM and turning it into a pulse sequence. I'd suggest looking further down the stack for a possible bug.\r\n\r\n## Steps to Reproduce (for bugs)\r\nThis issue relates to jobs created by [this file](https://github.com/decodoku/repetition_code/blob/master/repetition_code.ipynb). A stripped down version focussed on the job with the issue can be found [here](https://github.com/decodoku/Misc_QISKit_Things/blob/master/Simple_Repetition.ipynb). Results for runs with and without the issue are compared [here](https://github.com/decodoku/Misc_QISKit_Things/blob/master/RepetitionCodeBug.ipynb).\r\n\r\n## Context\r\n<!--- How has this issue affected you? What are you trying to accomplish? -->\r\n<!--- Providing context helps us come up with a solution that is most useful in the real world -->\r\n\r\n## Your Environment\r\n* Python 3.6.0\r\n* IBMQuantumExperience      1.9.0\r\n* qiskit                    0.4.14"}}
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