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CHANGELOG.md

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Changelog

0.0.5

  • Fix: Bug in swap.py. Added test to cover bug found.

  • Fix: Bug in ppt_distinguishability.py that prevented checking for higher dimensions. Added test to cover bug found.

  • Fix: Bug in ppt_distinguishability.py that prevented checking 2-dimensional cases.

  • Fix: Bug in state_distinguishability.py. Value returned was being multiplied by an unnecessary factor. Added other tests that would have caught this.

  • Fix: Bug in partial_trace.py. Added test to cover bug found.

  • Fix: Bug in partial_transpose.py for non-square matrices. Adding test cases to cover this previously failing case.

  • Fix: Bug in purity.py. Squaring matrix was using **2 instead of np.linalg.matrix_power

  • Fix: Bug in random_state_vector.py. Added tests to cover.

  • Fix: Bug in schmidt_rank.py. Added tests to cover.

  • Feature: Added in symmetric_extension_hierarchy.py. The function is a hierarchy of semidefinite programs that eventually converge to the separable value for distinguishing an ensemble of quantum states. The first level is just the standard PPT distinguishability probability. Computing higher levels of this hierarchy can become intractable quite quickly.

  • Feature: Added in ability to perform both minimum-error and unambiguous state discrimination in state_distinguishability.py. Adding additional tests to test_state_distinguishability.py to cover this extra feature.

  • Feature: Added majorizes.py; a function to determine whether a vector or matrix majorizes another. This is used as a criterion to determine whether a quantum state can be converted to another via LOCC. Added test_majorizes.py for unit testing.

  • Feature: Added perfect_matchings.py; a function that calculates all the perfect matchings of a given list of objects. Added test_perfect_matchings.py for unit testing.

  • Feature: Added breuer.py under states/; a specific bound-entangled state of interest. Added in test_breuer.py for unit testing.

  • Feature: Added brauer.py under states/. Added in test_brauer.py for unit testing.

  • Feature: Added entanglement_of_formation.py under state_props/. Added in test_entanglement_of_formation.py for unit testing.

  • Feature: Added l1_norm_coherence.py under state_props/. Added test_l1_norm_coherence.py for unit testing.

  • Enhancement: Adding further tests for symmetric_projection.py.

  • Enhancement: Adding further tests for ppt_distinguishability.py.

  • Enhancement: Adding further tests for reduction.py

  • Enhancement: Consolidating conclusive_state_exclusion.py and unambiguous_state_exclusion.py to just state_exclusion.py. Adding in optional parameter to specify method of exclusion. Consolidated tests in test_state_exclusion.py.

0.0.6

  • Feature: Added in_separable_ball.py under state_props/. Knowing whether a density matrix (quantum state) is contained in the separable ball centered at the maximally-mixed state is useful for separability testing. Added test_in_separable_ball.py for unit testing.

  • Feature: Added in ability to perform both minimum-error and unambiguous state discrimination in ppt_distinguishability.py. Adding additional tests to ppt_state_distinguishability.py to cover this extra feature.

  • Feature: Added in ability to compute both primal and dual optimization problems in ppt_distinguishability.py. This gives the user the capability to obtain the measurement operators and also to use the computationally efficiency of the dual problem to make quicker numeric calculations.

  • Feature: Added unvec.py under matrix_ops/. This feature is the inverse of pre-existing "vec" operation found in vec.py. That is, it allows one to take a vector and transform it to a (possibly square) matrix.

  • Feature: Added choi_to_kraus.py under channel_ops/. This feature allows the user to convert a Choi matrix to a list of Kraus operators. This is the inverse of the existing kraus_to_choi.py functionality that toqito currently offers.

  • Feature: Add is_mutually_orthogonal.py under state_props/. This feature allows the user to determine whether a given set of states (vectors) are mutually orthogonal with each other.

  • Feature: Add has_symmetric_extension.py under state_props/. This feature is very useful for determining whether a given state is entangled by checking whether there exists a symmetric extension for that state.

  • Feature: Add cvx_kron.py under helper/. This feature allows one to compute the Kronecker product between two entities, where either two may be of type np.ndarray or a cvxpy expression.

  • Feature: Add is_identity.py to state_props/. This feature allows one to check if a given matrix is equal to the identity matrix.

  • Enhancement: Previously ignore tests for channel_props/ are now being run as part of the testing suite.

  • Enhancement: More robust error checking and adding tolerance arguments for various matrix properties found in matrix_props/.

  • Doc-Fix: Trailing \`` removed in li_norm_coherence.py`.

  • Fix: Bug in symmetric_extension_hierarchy.py for level=1 case. Added test to cover this bug.

  • Fix: Bug in states/tile.py produced 3-dimensional vectors when they should have in fact been 9-dimensional vectors.

  • Fix: Warning in testing suite for test_symmetric_projection.py for previously using the deprecated numpy.matrix class has since been fixed and the warning hence resolved.

  • Fix: The states/isotropic.py file no longer requires the use of the deprecated numpy.matrix class.

0.0.7

  • Feature: Added is_unital.py under channel_props/. This feature allows the user to determine whether a given channel (specified by either its Choi matrix or by its Kraus operators) is unital.

  • Feautre: Added sqrt_channel_fidelity.py under channel_metrics/. This feature allows the user to calculate the root channel fidelity between the Choi representations of two quantum channels.

  • Enhancement: Adding rtol and atol tolerance parameters for is_herm_preserving.py.

  • Enhancement: Improving speed of calculating the classical value of nonlocal game. This enhancement is taken from QETLAB which was inspired by pre-print arxiv:2005.13418.

  • Enhancement: Parallel repetitions for the classical value of a nonlocal game is now supported.

  • Fix: The partial_channel.py function has been enhanced to deal with completely positive maps specified by Kraus operators as input.

  • Fix: The GHZ state now supports either dimension or parameter 1 instead of it previously being 2