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### What happened?
the partial trace function of the tensor_1d module contains a bug that causes it to fail when the kept subsystem is the last site of the system. This can be fixed by adding the l…
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I was wondering if it was possible to find ground states for spin chain Hamiltonians with long-range interactions i.e. beyond nearest neighbor.
Currently, this is how I create a nearest neighbor M…
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Hi, this is an interesting, yet difficult library! While it seems intriguing, I wonder thought about the interface: why is there always a 'do'? Why does the library not just wrap the API directly? Wri…
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When calling `TensorNetwork.contract()` or any related function that filters down to `tensor_contract()`, I don't think it is currently possible to shut off caching of contraction expressions. If the …
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### What happened?
- Create a `CircuitMPS` that flips a coin.
- Draw 50 samples from it.
- Do this with `seed=None`. Behavior is as expected.
- Do this with `seed` set to some random integer…
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scipy 1.13.0 was released half an hour ago and is breaking our CI
![Screenshot from 2024-04-02 15-25-51](https://github.com/quantumlib/Cirq/assets/5949112/54714925-7847-4f42-a8e7-046ce9ef7ccd)
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### Is your feature request related to a problem?
The phase gate has the matrix `diag(1, e^{i theta})` (reference: [PhaseGate in Qiskit](https://docs.quantum.ibm.com/api/qiskit/qiskit.circuit.library…
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Sphinx documentation is missing.
At the moment, only the README material is provided as user guide. As soon as docs will be available, I'd move even the bulk of it there, and keep in the README jus…
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I would like to use the approach in example [10. Bayesian Optimizing QAOA Circuit Energy](https://quimb.readthedocs.io/en/latest/examples/ex_tn_qaoa_energy_bayesopt.html) (using cotengra contraction o…
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### What happened?
Hello,
How can you define a Hamiltonian for an MPS with PBC using the SpinHam1D class? If you try to do this you get the error:
`NotImplementedError …