v0.28.0

Summary

Quantum Subspace Expansion

With the main functionaly implemented, quantum subspace expansion is now available in Mitiq! The technique requires a sequence of check operators, a Hamiltonian, and an observable in addition to the typical circuit and executor that Mitiq needs to operate.

from mitiq.qse import execute_with_qse

execute_with_qse(circuit, executor, check_operators, code_hamiltonian, observable)

This feature is still in flux, and would greatly benefit from further testing. Do give a try, and let us know if you have feedback! More details can be found in our API-doc. Congratulations to @bubakazouba for the great work here.

PEC Calibration

Last release we added support to run PEC experiments within the calibration module. This release we made two improvements:

1. Calibration experiments now represent all two-qubit gates by default (previously this was just $\mathrm{C}X$ and $\mathrm{C}Z$ gates.)
2. When running calibrator.run(log=True) you will now find results from your PEC pretty-printed alongside any ZNE experiments.

Installation

Our core dependencies (NumPy, Cirq, SciPy) are now less tightly specified which means easier installs for users!

Robust Shadow Estimation

@Min-Li has been hard at work bringing shadows to Mitiq. The shadows module is not quite ready for use, but you can get a sneak peak of what's to come in the Classical Shadows section of our API-doc.

All changes

• Fix docstring in qse.py (#1944) [@Misty-W]
• Add QSE to API-doc (#1938) [@natestemen]
• fix asv benchmarks (#1937) [@natestemen]
• [Classical Shadows 1] classical postprocessing (#1908) [@Min-Li]
• Add Calibration logging for PEC (#1873) [@Misty-W]
• [Classical Shadows 1] utils for shadows and unit test (#1907) [@Min-Li]
• Clean up types (#1825) [@natestemen]
• Relax test condition for test_execute_with_pauli_twirling (#1931) [@Misty-W]
• loosen remaining core dependency versions (#1917) [@natestemen]
• [Classical Shadows] quantum processing and test (#1906) [@Min-Li]
• Make PEC calibration support all multi-qubit-gate (#1881) [@YuNariai]
• Implements high-level functions for QSE (#1902) [@bubakazouba]
• Temporary fix for documentation problem (#1927) [@andreamari]
• Adding layerwise folding as tutorial to mitiq. (#1894) [@vprusso]
• Fix docstring of initialized_depolarized_noise (#1919) [@andreamari]
• Update broken URLs (#1912) [@Min-Li]
• indicate under active development on master (#1900) [@natestemen]

Dependency updates

• Update pennylane requirement from ~=0.30.0 to ~=0.31.0 (#1888) [@dependabot]
• Update cirq requirement from ~=1.1.0 to ~=1.2.0 (#1922) [@dependabot]
• Update qiskit requirement from ~=0.43.3 to ~=0.44.0 (#1935) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.51.0 to ~=1.52.0 (#1933) [@dependabot]
• Update qiskit-ibm-provider requirement from ~=0.6.1 to ~=0.6.2 (#1932) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.50.0 to ~=1.51.0 (#1928) [@dependabot]
• Update qiskit requirement from ~=0.43.2 to ~=0.43.3 (#1925) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.49.1 to ~=1.50.0 (#1926) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.49.0 to ~=1.49.1 (#1916) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.46.0 to ~=1.49.0 (#1915) [@dependabot]