[BUG] qml.TShift power method is incorrect

[willjmax]

Expected behavior

Raising a TShift operator to the power of 2 should return something.

Actual behavior

The current implementation of pow on the TShift operator is given by

    def pow(self, z):
        return super().pow(z % 3)

which calls the pow method on the Operator class, given by

        if z == 0:
            return []
        if z == 1:
            if QueuingManager.recording():
                return [qml.apply(self)]
            return [copy.copy(self)]
        raise PowUndefinedError

So, attempting to raise a TShift to the power of 2 results in a PowUndefinedError.

Additional information

No response

Source code

No response

Tracebacks

No response

System information

Name: PennyLane
Version: 0.39.0.dev25
Summary: PennyLane is a cross-platform Python library for quantum computing, quantum machine learning, and quantum chemistry. Train a quantum computer the same way as a neural network.
Home-page: https://github.com/PennyLaneAI/pennylane
Author: 
Author-email: 
License: Apache License 2.0
Location: /home/william.maxwell/venvs/pl-py3.10/lib/python3.10/site-packages
Editable project location: /home/william.maxwell/pennylane/pennylane
Requires: appdirs, autograd, autoray, cachetools, networkx, numpy, packaging, pennylane-lightning, requests, rustworkx, scipy, toml, typing-extensions
Required-by: amazon-braket-pennylane-plugin, PennyLane-Catalyst, PennyLane_Lightning, PennyLane_Lightning_Kokkos

Platform info:           Linux-6.8.0-45-generic-x86_64-with-glibc2.35
Python version:          3.10.12
Numpy version:           1.26.4
Scipy version:           1.12.0
Installed devices:
- lightning.qubit (PennyLane_Lightning-0.39.0.dev24)
- default.clifford (PennyLane-0.39.0.dev25)
- default.gaussian (PennyLane-0.39.0.dev25)
- default.mixed (PennyLane-0.39.0.dev25)
- default.qubit (PennyLane-0.39.0.dev25)
- default.qutrit (PennyLane-0.39.0.dev25)
- default.qutrit.mixed (PennyLane-0.39.0.dev25)
- default.tensor (PennyLane-0.39.0.dev25)
- null.qubit (PennyLane-0.39.0.dev25)
- reference.qubit (PennyLane-0.39.0.dev25)
- lightning.kokkos (PennyLane_Lightning_Kokkos-0.39.0.dev24)
- nvidia.custatevec (PennyLane-Catalyst-0.9.0.dev12)
- nvidia.cutensornet (PennyLane-Catalyst-0.9.0.dev12)
- oqc.cloud (PennyLane-Catalyst-0.9.0.dev12)
- softwareq.qpp (PennyLane-Catalyst-0.9.0.dev12)
- braket.aws.ahs (amazon-braket-pennylane-plugin-1.30.1)
- braket.aws.qubit (amazon-braket-pennylane-plugin-1.30.1)
- braket.local.ahs (amazon-braket-pennylane-plugin-1.30.1)
- braket.local.qubit (amazon-braket-pennylane-plugin-1.30.1)

Existing GitHub issues

• I have searched existing GitHub issues to make sure the issue does not already exist.