v0.7.2

Release Notes

• Fix getcoeff() behavior for DictStorage term sums. PauliSum was affected by this and had slow lookup.
• Add commutator between two VectorPauliSums
• In-place propagation without return, i.e., new_psum = propagate!(circuit, psum, params) now has the final results in psum, not only new_psum. Now new_psum === psum. Similarly for truncate!() and merge!().
• Implement extractsum!() in PropagationBase as the intended way of extracing the active main sum on a propagation cache.
• Standardize == and \approx for all AbstractTermSum.
• Implement mult!() for propagation caches.
• Implement merge() and truncate()

v0.7.1

Performance fixes:

• dispatch to Base.iterate() for PauliSum
• replace Pauli rotation gate with gate bitmask in commutes()
• inline iterate(), add!(), set!()

v0.7.0

New Features

• VectorPauliSum propagation which is natively multi-threaded in propagation.
• An experimental PauliPropagationCUDA extension that allows PauliRotation gates to execute on the GPU.
• Schrödinger picture propagation for some gates, including PauliRotation, CliffordGate, and PauliNoise.
• ImaginaryPauliRotation gates in the Schrödinger picture.

Design changes

• Large chunks of the propagation code was migrated into PauliPropagation.PropagationBase in preparation for moving it into its own PropagationBase.jl repo.
• Introduced AbstractTermSum and AbstractPauliSum as abstract types with uniting behavior. Useful defaults available for Dict and Vector storage.
• Introduced propagation caches and the abstract type AbstractPropagationCache. These wrap evolving AbstractTermSum objects with optional additional objects necessary for efficient propagation.

Breaking Changes

Breaking changes do not affect high-level users. Only users defining custom gates and propagation subroutines.

• The argument order and argument types of applymergetruncate!() and applytoall!() was changed for to receive propagation caches and the optional parameter as last argument.
• applyandadd!() was removed.
• Merging functions mergeandempty!() and below and truncation functions checktruncationsonall!() and below where simplified and reworked into merge!() and truncate!().

v0.6.0

What's Changed

• Feat: symmetry merging (translation) by @teng10 in #121
• Add trace operation by @timbode in #107
• v0.6.0 by @MSRudolph in #126

New Contributors

• @timbode made their first contribution in #107

Full Changelog: v0.5.2...v0.6.0

v0.5.2

What's Changed

• Convert the coefficient types for PauliString and PauliSum by @teng10 in #115
• Fix overlapwithcomputational() for empty PauliSum by @alam-faisal in #120
• Improve getpauli and setpauli for multiple sites by @teng10 in #112

New Contributors

• @alam-faisal made their first contribution in #120

Full Changelog: v0.5.1...v0.5.2

v0.5.1

What's Changed

• fix bug in amplitude damping noise where coeff would not be multiplied by @MSRudolph in #118

Full Changelog: v0.5.0...v0.5.1

v0.5.0

Breaking Changes

• Update version support infromation to match LTS

Further Changes

• New propagation visualization capabilities
• External correctness tests via Yao.jl
• Python usage example notebook via JuliaCall
• Error mitigation example notebook
• Improved O(1) pauli product function
• Add and use pauliprod() function between PauliSum's
• Fix a bug where the minus function would work in-place
• Fix bugs in test that would sometimes falsely report errors

New Contributors

• @ahkatlio made their first contribution in #98
• @Fe-r-oz made their first contribution in #101
• @isaachyw made their first contribution in #103
• @zmorrell made their first contribution in #105
• @JuliaGerecke made their first contribution in #109

Full Changelog: v0.4.1...v0.5.0

v0.4.1

What's Changed

• Fixed a bug in automatic conversion checks for PauliFreqType coefficients when max_freq or max_sins are defined.

Full Changelog: v0.4.0...v0.4.1

v0.4.0

Breaking Changes

• overlapwithpaulisum() now has an extra factor of 2^nqubits to be in line with other overlap functions. scalarproduct() takes its place instead.
• The Y Clifford gate definition had a missing minus sign.
• Removal of some toy functions like commutes() between two symbols.
• The low-level truncation functions are no longer exported

Further Changes

• Many docs clarifications or removals for functions exposed on the docs page
• Addition of functions like + and * between PauliSum and PauliString
• Automatic promotion of types for these operations
• Automatic wrapping of coefficients into PauliFreqTracker when max_sin or max_freq are not Inf.

New Contributors

• @ErikWeiss made their first contribution in #80

Full Changelog: v0.3.0...v0.4.0

v0.3.0

What's Changed

• Rework Pauli integer types by @MSRudolph in #73. Rework our integer types to be custom defined to the next possible bit length with BitIntegers.jl, pirate a value-based hash function, remove the union type constraint for PauliStringType and PauliType
• Compiler safe cliffordmap by @MSRudolph in #69
• Rename and do not export Pauli damping by @MSRudolph in #60

Full Changelog: v0.2.1...v0.3.0