Currently, most samples only have a C# host program. It would be nice if more or even most samples demonstrated how to use Python to call into Q#.

Samples with Python Hosts

• algorithms
  • chsh-game
  • database-search
  • integer-factorization
  • oracle-synthesis
  • order-finding
  • reversible-logic-synthesis
  • simple-grover

• arithmetic

The katas offer a set of programming exercises on quantum computing and reference solutions to them, but we often hear that it would be helpful to have the solutions explained, with the logic steps necessary to arrive from the problem description to the code spelled out. It is especially important for people who go through the katas on their own, without a study group to support them.

To addres

Information

• Qiskit Terra version: master
• Python version: 3.7
• Operating system: MacOS

Steps to reproduce the problem

from qiskit import *
qc = QuantumCircuit(2)
qc.draw('latex')

IndexError: list index out of range

What is the expected behavior?

Same as other drawers:

qc.draw('text')

q_0: 
     
q_1: 

We should fix all latex expressions that have no $ sign around them. I found one in channel: https://github.com/quantumlib/Cirq/blob/master/cirq/protocols/channel.py

In the new devsite both the inline (single $) and paragraph ($$) latex works so we should make sure we use them!

To get this codebase up to standard, we need to add type hints. At the very least, perhaps we should start insisting that all new code has type hints added, but moreover we need to add typing to the code that currently exists.

This is a pretty large project, but luckily it can be done incrementally - I believe at this point it's a stretch goal for v1, if anyone wants to help it would be much ap

Running travis lint gives a bunch of warning. Like for instance, sudo : required is no longer needed, and Travis migrated to a new architecture. So the travis.yml file needs to be updated.

https://blog.travis-ci.com/2018-10-04-combining-linux-infrastructures

For example, pylint would have caught ProjectQ-Framework/ProjectQ#19 via an undefined variable warning.

What is the expected enhancement?

>>> from qiskit.aqua.operators import I, X
>>> (0 * X + I) == I
False  # should be True

A possible solution would be to add a ``SummedOp.chop_summands(threshold=0)

Repro:

(describe #'COMMUTE-RZ-AFTER-CPHASE)

Output:

#<COMPILER COMMUTE-RZ-AFTER-CPHASE {10149CF36B}>
  [funcallable-instance]


Lambda-list: (X Y &KEY CONTEXT)
Derived type: (FUNCTION (T T &KEY (:CONTEXT T)) (VALUES T &OPTIONAL))
Documentation:
  T
Source file: quilc/src/compressor/rewriting-rules.lisp

Slots with :INSTANCE allocation:
  NAME                           

Now, there's no unit test.