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Deprecate referenceqvm #22

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## Reference QVM is deprecated. Most of the features have been integrated into [pyQuil](https://github.com/rigetti/pyquil/) and are actively developed there.

# Reference QVM

The `referenceqvm` is the reference implementation of the QVM outlined in the
The `referenceqvm` was a reference implementation of the QVM outlined in the
arXiv:1608:03355 by Robert Smith, Spike Curtis, and Will Zeng. It is a research package that
supports rapid prototyping and development of quantum programs using pyQuil.

Currently, this QVM supports a subset of functionality in the Quil specifications,
excepting certain functions (DEFCIRCUIT, WAIT, NOP).
excepting certain functions (DEFCIRCUIT, WAIT, NOP), as well as prototypes for
Kraus operator noise simulations and CHP/clifford circuit simulation.

Noise models (dephasing, Kraus operators), parametrization with bits in
classical memory, and other features will be added in future releases.
The functionality prototyped in this repository has been integrated into [pyQuil](https://github.com/rigetti/pyquil/).

## PyQuil

`referenceqvm` functionality is now in pyQuil in the following modules: `unitary_tools.py`, `reference_simulator.py`, `gate_matrices.py`, and `pyqvm.py`. Additionally, there are more performant referenceqvm-style pure-python simulators in `numpy_simulator.py`. The clifford circuit simulation has not been ported, but we would love to accept that as a community contribution (with some clean-up and integration work to play nice with pyQuil).

## Installation

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