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Release 0.5.1
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@josh146 josh146 released this 14 Sep 01:55
· 335 commits to master since this release
v0.5.1
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Learn about vigilant mode.

This is a significant release, bringing the plugin up to date with the latest
PennyLane and Qiskit features.

New features since last release

  • The plugin and the tests have been completely re-written from scratch, to ensure high quality and remove technical debt. #44 #43

  • Samples and variance support have been added to all devices. #46

  • Multi-qubit hermitian observables are now supported, due to support being added in Qiskit version 0.12.

  • Support has been added for IBM Q Experience 2.0. #44

Improvements

  • Hardware and software devices are now treated identically, with expectations, variance, and samples computed via the probability, not the amplitudes. This has several consequences:

    • It makes the code cleaner and simpler, as there is now one defined way of computing statistics.

    • It is faster in most cases, as this does not require computing large matrix-vector products, or Kronecker products. Instead, eigenvalues of single- and multi-qubit observables are computed using dyanamic programming.

    • It reduces the number of tests required.

  • Test suite now includes tests against the IBM Q Experience, in addition to the local simulators.

Bug fixes

  • Due to the move to IBM Q 2.0 credentials, users remaining with IBM Q v1.0 now must pass an additional URL argument to the service. The plugin has been modified to allow the user to pass this argument if required. #44

  • Fixed a bug where backend keyword arguments, such as backend_options and noise_model, were being passed to backends that did not support it. #51

Contributors

This release contains contributions from:

Shahnawaz Ahmed, Josh Izaac

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