add iswap gate

[Simone-Bordoni]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[Simone-Bordoni]

I don't know if other parts must be edited

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (2606a97) compared to base (5f1c614).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #707   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           88        88           
  Lines        11615     11629   +14     
=========================================
+ Hits         11615     11629   +14     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/qibo/models/circuit.py	100.00% <ø> (ø)
src/qibo/backends/npmatrices.py	100.00% <100.00%> (ø)
src/qibo/gates/gates.py	100.00% <100.00%> (ø)
src/qibo/tests/test_gates_gates.py	100.00% <100.00%> (ø)

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[scarrazza]

@Simone-Bordoni thank you, looks good. The only missing feature is the circuit.draw symbol plot definition.

[scarrazza]

In particular here:

qibo/src/qibo/gates/gates.py

Line 7 in 7b9ca94

QASM_GATES = {

[stavros11]

Thanks @Simone-Bordoni, looks good.

In particular here:

qibo/src/qibo/gates/gates.py

Line 7 in 7b9ca94

QASM_GATES = {

This is for circuit.to_qasm(). For circuit.draw(), the gate should be added here:

qibo/src/qibo/models/circuit.py

Line 1287 in 7b9ca94

labels = {

I think we should add it in both places. Far draw we should decide on a symbol, qiskit uses ⨂.

[Simone-Bordoni]

I have added these parts, for now i have used "i" simbol for the circuit.draw()

[stavros11]

Looks good to me, thanks.