v0.44.0

[natestemen]

(Full Changelog)

Highlights

🚀 This release introduces the first version of the Virtual Distillation (VD) technique in Mitiq, which is now available for use! This technique was prototyped and implemented by a team of students at the University of Amsterdam. VD uses additional qubits to distill a purer version of the quantum state of interest. The implementation is in its early stages so lacks support for all QPROGRAM types. Currently only programs written in cirq are supported. We welcome feedback and suggestions for improvement.

from mitiq import vd

vd.execute_with_vd(circuit, execute)
>>> np.array([0.5, 0.5]) # [<Z_0>, <Z_1>] assuming the circuit acts on 2 qubits

We've also made further enhancements to the Layerwise Richardson Extrapolation (LRE) technique, including support for observables and the mitiq.Executor class. mitiq.lre also has two new functions mitiq.lre.construct_circuits and mitiq.lre.combine_results that allow users to generate circuits and combine results in a more modular way (bringing this module in line with the other error mitigation techniques). An example workflow for the two step application LRE is shown below:

from mitiq import lre

lre_circuits = lre.construct_circuits(circuit, degree, fold_multiplier)

results = execute(lre_circuits)

lre_result = lre.combine_results(results, circuit, degree, fold_multiplier)

🚨 Breaking Changes

For uniformity across modules within Mitiq we have renamed the folowing functions:

1. mitiq.zne.scaled_circuits -> mitiq.zne.construct_circuits
2. mitiq.ddd.generate_circuits_with_ddd -> mitiq.ddd.construct_circuits
3. mitiq.pec.generate_sampled_circuits -> mitiq.pec.construct_circuits

With this change, you will find the function mitiq.<module>.construct_circuits in all of ZNE, PEC, DDD, LRE, and VD.

We've also bound the version of numpy to be less than 2.0.0 due to some conflicts when using this latest major version.
We hope to support numpy 2.0.0 in a coming release.

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If you're interested in error mitigation, check out our upcoming error resilience workshop in NYC! WERQSHOP: Workshop on Error Resilience Quantum computing (https://werq.shop).

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✨ Enhancements

• Modularization uniformity for ZNE, PEC, DDD, and LRE (Modularization uniformity for ZNE, PEC, DDD, and LRE #2709) [@bdg221]
• Add main API entry points for virtual distillation (Add main API entry points for virtual distillation #2658) [@Jegbrz]
• UFund => UFoundation (UFund => UFoundation #2706) [@natestemen]
• allow list/tuple constructor in executor typehints (allow list/tuple constructor in executor typehints #2700) [@natestemen]
• Adding utility functions for Virtual Distillation. (Adding utility functions for Virtual Distillation. #2698) [@FarLab]
• Auxilliary code for VD to apply a Bi matrix on a circuit (Auxilliary code for VD to apply a Bi matrix on a circuit #2650) [@khknopp]
• Adding support for observables in LRE executors (Adding support for observables in LRE executors #2681) [@Shivansh20128]
• Adding modularized function generate_circuits_with_ddd (Adding modularized function generate_circuits_with_ddd #2618) [@Shivansh20128]
• Allow for Executor class and batched Executors for LRE (Allow for Executor class and batched Executors for LRE #2676) [@bdg221]
• Adding modularized function generate_sampled_circuits (Adding modularized function generate_sampled_circuits #2619) [@Shivansh20128]
• Default scaling method in modularized ZNE function (Default scaling method in modularized ZNE function #2666) [@purva-thakre]

📓 Documentation

• Adding docstrings to Observable class (Adding docstrings to Observable class #2699) [@Shivansh20128]
• add Virtual Distillation rfc to the contributing page and a new row in the error mitigation techniques in the readme. (add Virtual Distillation RFC #2691) [@FarLab]

📦 Dependency Updates

• bound numpy from above (bound numpy from above by 2.0.0 #2712) [@natestemen]
• Update qiskit-ibm-runtime requirement from ~=0.36.1 to ~=0.37.0 (Update qiskit-ibm-runtime requirement from ~=0.36.1 to ~=0.37.0 #2693) [@dependabot]
• Update qiskit-aer requirement from ~=0.15.1 to ~=0.17.0 (Update qiskit-aer requirement from ~=0.15.1 to ~=0.17.0 #2694) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.90.2 to ~=1.91.0 (Update amazon-braket-sdk requirement from ~=1.90.2 to ~=1.91.0 #2697) [@dependabot]
• Update qiskit requirement from ~=1.4.1 to ~=1.4.2 (Update qiskit requirement from ~=1.4.1 to ~=1.4.2 #2696) [@dependabot]
• Bump openfermion from 1.6.1 to 1.7.0 (Bump openfermion from 1.6.1 to 1.7.0 #2671) [@dependabot]
• Update amazon-braket-sdk requirement from ~=1.69.0 to ~=1.90.2 (Update amazon-braket-sdk requirement from ~=1.69.0 to ~=1.90.2 #2690) [@dependabot]
• Update qibo requirement from ~=0.2.15 to ~=0.2.16 (Update qibo requirement from ~=0.2.15 to ~=0.2.16 #2689) [@dependabot]
• Update qiskit-ibm-runtime requirement from ~=0.20.0 to ~=0.36.1 (Update qiskit-ibm-runtime requirement from ~=0.20.0 to ~=0.36.1 #2314) [@dependabot]
• Update scipy requirement from <=1.14.1,>=1.10.1 to >=1.10.1,<=1.15.2 (Update scipy requirement from <=1.14.1,>=1.10.1 to >=1.10.1,<=1.15.2 #2673) [@dependabot]
• Update qiskit requirement from ~=1.3.1 to ~=1.4.1 (Update qiskit requirement from ~=1.3.1 to ~=1.4.1 #2685) [@dependabot]
• Update pyquil requirement from ~=3.5.4 to ~=4.11.0 (Update pyquil requirement from ~=3.5.4 to ~=4.11.0 #2063) [@dependabot]

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This discussion was created from the release v0.44.0.