Mitiq

All Changes

- Fix broken links on the website (erkska, gh-400).
- Use cirq v0.9.0 instead of cirq-unstable (karalekas, gh-402).
- Update mitiq.about() (rmlarose, gh-399).
- Refresh the release process documentation (karalekas, gh-392).
- Redesign factories, batch runs in BatchedFactory, fix Qiskit utils tests (rmlarose, andreamari, gh-381).
- Add note on batched executors to docs (rmlarose, gh-405).
- Added Tensorflow Quantum executor to docs (k-m-schultz, gh-348).
- Fix a collection of small build & docs issues (karalekas, gh-410).
- Add optimal QPR decomposition for depolarizing noise (karalekas, gh-371).
- Add PEC basic implementation assuming a decomposition dictionary is given (andreamari, gh-373).
- Make tensorflow requirements optional for docs (karalekas, gh-417).

Thanks to erkska and k-m-schultz for their contributions to this release!

│ Scale method: fold_global │ Improvement factor: 0.3333 │ Improvement factor: 0.9709 │
├────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ Technique: ZNE │ ✘ │ ✔ │
│ Factory: Richardson │ Noisy error: 0.03 │ Noisy error: 1.0 │

│ Scale method: fold_global │ Improvement factor: 0.72 │ Improvement factor: 1.0025 │
└────────────────────────────────────┴────────────────────────────┴────────────────────────────┘


**New benchmarking circuits:** `mitiq.benchmarks` now contains a function `generate_random_clifford_t_circuit` which does what it says on the tin.
Special shoutout to new UF team member Farrokh Labib (farlab) for this contribution.

py
from mitiq.benchmarks import generate_random_clifford_t_circuit

clifft = generate_random_clifford_t_circuit(
num_qubits=2,
num_oneq_cliffords=5,
num_twoq_cliffords=5,
num_t_gates=5
)
print(clifft)
0: ──────────────S───T──────H───T───X───T───T─────────────
│ │ │ │ │
1: ───S───T──────────────X──────────────S──────────X───S───


The `Executor.run` method now supports a single circuit instance in addition to a list for ease of use when working with a single circuit.

diff
- executor.run([circuit])
+ executor.run(circuit)


**Faster Tests!** Working on Mitiq has never been easier to develop with a faster (by 36%) test suite.

📓 Documentation

This release contains quite a few documentation improvements, including

1. New workflow images to elucidate the workflow for for using the `mitiq.shadows` module (available [here](https://mitiq.readthedocs.io/en/stable/guide/shadows.html))
2. A reorganized API-doc which should be easier to navigate
3. General clean up of the CDR user guide pages

Commits

- Clarify CDR training docs regarding the use of a markov chain monte carlo (2130) [natestemen]
- Update workflow images in documentation (2034) [purva-thakre]
- 2115 pauli twirling callibration of expectation estimation shadow needs continue (2116) [bdg221]
- Add randomized clifford+T benchmarking circuits. (2118) [farlab]
- Frontend/Backend docs clean up (2124) [natestemen]
- Speed up tests using mocks (2126) [natestemen]
- resolve flaky mirror QV circuit test (2127) [natestemen + misty-w]
- Simplify expectation_estimation_shadow code (2113) [bdg221]
- Refactor calibration logs (2074) [kozhukalov]
- Organize API-doc (2104) [purva-thakre]
- add support for single circuit on exeuctor run method (2099) [emilianog-byte]

📦 Dependency updates

- Update qiskit-ibm-provider requirement from ~=0.7.2 to ~=0.7.3 (2122) [dependabot]
- Update cirq requirement from <1.3.0,>=1.0.0 to >=1.0.0,<1.4.0 (2107) [dependabot]
- Update pennylane requirement from ~=0.32.0 to ~=0.33.1 (2091) [dependabot]
- Update pennylane-qiskit requirement from ~=0.32.0 to ~=0.33.0 (2081) [dependabot]
- Bump stim/stimcirq from 1.12.0 to 1.12.1 (2106) [dependabot]
- Update amazon-braket-sdk requirement from ~=1.59.2 to ~=1.64.1 (2089 + 2094 + 2114 + 2123) [dependabot]
- Update scipy requirement from <=1.11.3,>=1.5.0 to >=1.5.0,<=1.11.4 (2095) [dependabot]

🧑‍💻 Dev Dependency updates

- Bump myst-nb from 0.17.1 to 1.0.0 (2090) [dependabot]
- Bump pandas from 2.1.2 to 2.1.3 (2093) [dependabot]
- Bump matplotlib from 3.8.0 to 3.8.1 (2084) [dependabot]
- Bump isort from 5.12.0 to 5.13.2 (2120 + 2125) [dependabot]
- Bump actions/setup-python from 4 to 5 (2112) [dependabot]

│ Scale method: fold_global │ Improvement factor: 0.5333 │ Improvement factor: 1.0309 │
├────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ Technique: ZNE │ ✘ │ ✔ │
│ Factory: Linear │ Noisy error: 0.03 │ Noisy error: 1.0 │

([Full Changelog](https://github.com/unitaryfund/mitiq/compare/v0.42.0...v0.43.0))

Highlights

This release marks the first step toward Virtual Distillation (VD) in Mitiq, with an initial helper function that vertically copies a circuit _M_ times.
A team of students at the University of Amsterdam worked for the month of January on implementing the technique that will be integrated into Mitiq over the coming releases.
We also have a new tutorial thanks to purva-thakre on combining Pauli Twirling and Zero-Noise Extrapolation!

We are currently testing Layerwise Richardson Extrapolation (LRE) on hardware, and work has begun on Probabilistic Error Amplification (PEA)---stay tuned for more updates in future releases!

✨ Enhancements

- First PR for VD, helper function that copies a circuit M times (2649) [chrispy-chicken]

📓 Documentation

- added section on modular functions for ZNE (2657) [FarLab + natestemen]
- PT + ZNE tutorial (2601) [purva-thakre]
- Changed the badge to Unitary Foundation (2645) [muddi900]
- Typos in PEC User Guide (2637) [purva-thakre]
- typo corrected from supeconducting to superconducting (2617) [vrajan1996]
- Small fixes in docstrings (2663) [cosenal]

🧑🏽‍💻 Developer Improvements

- LRE failure for chunking (2608) [purva-thakre]
- update version, changelog (2613) [purva-thakre]

📦 Dependency Updates

- Bump pyscf from 2.7.0 to 2.8.0 (2633) [dependabot]
- Update qibo requirement from ~=0.2.13 to ~=0.2.15 (2643) [dependabot]