v0.7.0

Breaking Changes

• Major module re-org of superoperator tools into operator_tools also moved random_operators to the operator tools module. Added type checking in random operators, added new module to check plain old operators are unitary etc (gh-150, 140, 164).
• Remove symmetrization functionality from observable_estimation in favor of pyquil functionality (gh-194).
• Methods in fitting renamed to be less ambiguous decay_constant_param_decay -> decay_time_param_decay and
  fit_decay_constant_param_decay -> fit_decay_time_param_decay. Correspondingly, the fit parameter was renamed
  decay_constant -> decay_time(gh-175)
• generate_cz_phase_ramsey_experiment was made plural, consistent with rest of qubit_spectroscopy (gh-175)
• acquire_cz_phase_ramsey_data removed in favor of estimate_observables and all other specific acquire_* methods
  in qubit_spectroscopy.py were removed in favor of acquire_qubit_spectroscopy_data (gh-175)
• argument order standardized, which changed the api of generate_exhaustive_process_dfe_experiment,
  generate_exhaustive_state_dfe_experiment, generate_monte_carlo_state_dfe_experiment,
  generate_monte_carlo_process_dfe_experiment, robust_phase_estimate,
  and positional arg name of acquire_dfe_data (gh-182)

Improvements and Changes

• Fixed the years in this Change log file 2018 -> 2019
• Added linear inversion process tomography (gh-142)
• Changed qubit tensor factor ordering of state tomography estimates to match that of process tomography, e.g.
  tomographizing the plus eigenstate of X0 * Z1 and passing in qubits = [0,1] will yield the state
  estimate corresponding to |+0> = (1, 0, 1, 0)/sqrt(2) rather than |0+> (gh-142)
• Improved the superoperator_tools notebook and the random_operators notebook (gh-98)
• Improvements to Ripple carry adder notebook, added tests for non parametric bit string
  prep program in utils (gh-98)
• Added the ability to project a Choi matrix to the closest unitary (gh-159, 157)
• Reduced local test run time from 11min to 5min (gh-160)
• Major changes and improvements to all notebooks (gh-148, 149, 153, 154, 155, 156, 165, 167, 172, 182(see 183))
• Speedup the tests (gh-158, 161)
• Complete overhaul/addition of documentation in docs folder (gh-170, 174)
• Github PR and bug report templates added (gh-177, 182)
• merge_disjoint_experiments and get_results_by_qubit_groups added to observable_estimation.py to facilitate
  running experiments 'in parallel' on a QPU and analyzing the results separately (gh-182)
• various do_* methods added that wrap various experiments into a single method with sensible defaults (gh-182)
• examples notebooks moved to docs/ directory to be rendered within documentation (gh-182)
• tqdm progress bars added to most data acquisition methods (gh-182)

Bugfixes

• Dagger is now implemented in pyquil as a gate-level modifier, but this doesn't play well with noise models on the QVM
  so a stop-gap was put into basic_compile to hand compile the dagger modifier (gh-169)
• Compiler sometimes failed to find connected subgraphs of qubits (gh-188)
• QPU cannot handle integer parameters (gh-188)