v0.9.0

Version 0.9.0 (June 17th, 2021)

Summary

The main addition introduced in this release is the implementation of a new error mitigation technique: (variable-noise) Clifford data regression (arXiv:2005.10189, arXiv:2011.01157). This is structured as a Mitiq module called mitiq.cdr.

Another important change is the integration with Amazon Braket, such that Mitiq is now compatible with circuits of type braket.circuits.Circuit. Moreover all the existing Mitiq integrations are now organized into unique module called mitiq.interface.

In the context of probabilistic error cancellation, the sub-module mitiq.pec.representations has been significantly improved. Now one can easily compute the optimal quasi-probabiliy representation of an ideal gate as a linear combination of NoisyOperation objects.

Thanks to all contributors (@L-P-B, @Aaron-Robertson, @francespoblete, @LaurentAjdnik, @maxtremblay, @andre-a-alves, @paniash, @purva-thakre) and in particular to the participants of unitaryHACK!

All Changes

• New notation NoisyOperation(circuit, channel_matrix) (@andreamari, gh-725).
• Update docs for transforming Qiskit registers (@rmlarose, gh-724).
• Remove classical register transformations in Qiskit conversions (@Aaron-Robertson, gh-672).
• Change return format for execute_with_cdr (@rmlarose, gh-722).
• Organize supported packages in mitiq.interface (@rmlarose, gh-706).
• Change requirements to Cirq 0.10 (@andreamari, gh-717).
• Make CDR work with any QPROGRAM (@rmlarose, gh-718).
• Clearer return type for extrapolate and remove deprecated method (@rmlarose, gh-714).
• Update feature request template (@rmlarose, gh-713).
• CDR part two - Clifford data regression functions to fit training data (@L-P-B gh-677).
• Consolidate images, update README. (@rmlarose, gh-709).
• New logo for readme (@crazy4pi314, @francespoblete, gh-709).
• Update Guidelines for Release (@nathanshammah, gh-707).
• Add action to close stale issues/pr #698 (@crazy4pi314, gh-699).
• Optimal quasi-probability representations (@andreamari, gh-701).
• Update links to Cirq documentation (@LaurentAjdnik, gh-704).
• Warning for short programs [unitaryHACK] (@Yash-10, gh-700).
• Preparing for optimal representations: Helper functions for channel manipulation. (@andreamari, gh-694).
• [UnitaryHACK] Improve conversion from braket to cirq (@maxtremblay, gh-688).
• [unitaryHack] Add instructions to solve make docs error for Windows/3.8 users (@andre-a-alves, gh-691).
• Add link to docs for source installation in README (@paniash, gh-682).
• Mention Braket in the README (@andreamari, gh-687).
• [UnitaryHACK] ZNE-PEC uniformity (@andre-a-alves, gh-656).
• Minor update of parameter noise scaling (@andreamari, gh-684).
• Add braket support via rudimentary translator (@rmlarose, gh-590).
• Specify qiskit elements in output of about.py (@purva-thakre, gh-674).
• Depend only on cirq-core (@rmlarose, gh-673). This was reverted in gh-717.
• Fix docs build (@rmlarose, gh-671).
• Fix is_clifford logic for Clifford Data Regression (@L-P-B gh-669).