Issue with sympy quantum module

[Iman]

Hello,

I encountered a issue with the output of the following script:

from sympy.physics.quantum import *
represent(Y(0)*Y(0),nqubits=1)

I am expecting the ouput being a 2 by 2 identity matrix. But instead,
the output is a single number 1.

I don't know if it is a bug in the Python code or I misused the python function.

Thank you,

Iman

[Oscar Benjamin]

It probably is a bug but the code shown does not run for another reason:

In [1]: from sympy.physics.quantum import *
...: represent(Y(0)*Y(0),nqubits=1)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-1-ba167e22823e> in <cell line: 2>()
1 from sympy.physics.quantum import *
----> 2 represent(Y(0)*Y(0),nqubits=1)

NameError: name 'Y' is not defined

--
Oscar

[Iman]

It runs on my PC. 

I imported additional modules: 

from sympy.physics.quantum import *
from sympy.physics.quantum.qubit import *
from sympy.physics.quantum.gate import *
from sympy.physics.quantum.grover import *
from sympy.physics.quantum.qft import QFT, IQFT, Fourier
from sympy.physics.quantum.circuitplot import circuit_plot

Sorry about the confusion. 

The output of a single Y(0) is correct. But two Y(0) multiplying is not. 

represent(Y(0),nqubits=1)

[Oscar Benjamin]

This is perhaps related to this issue:
https://github.com/sympy/sympy/issues/24153

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