v1.5.1

What's Changed

• Resolves failing cirq pre-release by @ncrubin in #794

Full Changelog: v1.5.0...v1.5.1

Mainly fixes a issue with using linalg.expm instead of scipy.sparse.linalg.expm such that the right data types are being passed around.

v1.5.0

What's Changed

• Fix reference to deprecated SingleQubitGate by @dstrain115 in #788
• Making OF compatible with cirq>0.15 by @ncrubin in #793

Full Changelog: v1.4.0...v1.5.0

v1.4.0

What's Changed

• Reset version to "dev" by @mpharrigan in #759
• fault-tolerant resource estimates for chemical hamiltonians by @jjgoings in #763
• Fix QuadraticHamiltonian diagonalization by @kevinsung in #772
• Reduced BCS type Hamiltonians by @cvmxn1 in #770
• Fix cirq coverage test by @dstrain115 in #779
• Fix cirq.google reference in docs. by @dstrain115 in #778
• Move tutorial from cirq by @augustehirth in #783
• DropNegligible was used but is deprecated. by @WhiteSymmetry in #781
• Adds a link to the Q-Chem plugin in README by @epifanovsky in #784
• Lookup dictionary for JW transformation of a FermionOperator by @alexfleury in #777
• Pin Requirements to working cirq versions by @ncrubin in #786

New Contributors

• @jjgoings made their first contribution in #763
• @cvmxn1 made their first contribution in #770
• @dstrain115 made their first contribution in #779
• @augustehirth made their first contribution in #783
• @WhiteSymmetry made their first contribution in #781
• @epifanovsky made their first contribution in #784
• @alexfleury made their first contribution in #777

Full Changelog: v1.3.0...v1.4.0

v1.3.0

OpenFermion 1.3 is an incremental update with some fixes and improvements (see below). Crucially, we have moved from pinning to a specific version of Cirq to having a minimum supported version of Cirq (0.12 for this release).

Changes

• Implement Bravyi-Kitaev for InteractionOperator (#753)
• Fix unexpected behavior of symmetry_conserving_bravyi_kitaev (#734)
• Revamp CI: matrix, multi-Cirq (#755)

v1.2.0

Upgrade cirq compatibility.

What's Changed

• [Docs] Format math expressions by @rmlarose in #738
• Adding mention of OpenFermion-FQE to the frontpage by @babbush in #740
• Added functionality to compute one-norm of qubit/majorana Hamiltonian from molecular integrals by @Emieeel in #725
• Updates linux CI to use 18.04 by @MichaelBroughton in #747
• Updates fqe include path for site rendering by @MichaelBroughton in #746
• Upgrade to cirq 0.12 by @tanujkhattar in #748
• Version bump by @ncrubin in #749

New Contributors

• @tanujkhattar made their first contribution in #748

Full Changelog: v1.1.0...v1.2.0

v1.1.0

levels up to cirq 0.11

v1.0.1

Creating official release from March 6th v1.0.1 release of OpenFermion associated with commit ( c22551f).

OpenFermion v1.0

This release is for the stable 1.0 version of OpenFermion. Significant changes from the 0.11 release have been made. The most notable changes are listed below.

Features:

MajoranaOperator <-> FermionOperator with Jordan-Wigner + Bravyi-Kitaev options, get_majorana acts like get_fermion operator.
Is_contextual for confirming if a Hamiltonian is contextual
SymbolicOperator coefficients are sympy.Expr objects
Partitioning schemes for measuring fermionic 1- and 2-RDMs
Functionality for the Hartree-Fock project
Spatial -> spin-orbital integrals
Extended RPA
Constructing a pure 2-body (reduced Hamiltonian) from 1-body and 2-body InteractionOperator.
Construct antisymmeterized 2-electron integrals + coulomb + exchange matrices
Verified phase estimation utilities

Organization:

Merging of OpenFermion-Cirq into OpenFermion
Reorganize package (#620) (new submodules: chem, linalg, circuits, functionals, transforms)
Sample data is integrated with package for testing.
Reorganize utils
Deprecation of Readthedocs as the documentation host. Docs are now generator by tensorflow-docs and hosted at https://quantumai.google/openfermion

OpenFermion v0.11.0

Starting with this version, Python 2 is no longer supported. Other notable changes and additions:

• Functions to partition qubits into subsets for efficient measurement of Pauli strings: openfermion.binary_partition_iterator, openfermion.partition_iterator, openfermion.pauli_string_iterator.
• Added structure argument to openfermion.geometry_from_pubchem. It is recommended to set this to '3d' to ensure correct structures are returned (see #544).
• openfermion.get_number_preserving_sparse_operator.
• openfermion.prony.

OpenFermion v0.10.0

Notable changes and additions:

• Adds a new class, MajoranaOperator, to represent operators in the Majorana basis. Support for this operator added to openfermion.jordan_wigner and openfermion.bravyi_kitaev.
• Speeds up construction of jellium Hamiltonians by utilizing translation invariance
• openfermion.wedge
• Adds some utility methods to InteractionOperator
• Utilities for tapering off qubits using stabilizer conditions: openfermion.utils.taper_off_qubits, openfermion.utils.reduce_number_of_terms
• Fixes a bug that caused incompatibility with scipy 1.3.0