v.1.9.7

Minor convenience changes
Major Performance improvements for wavefunction simulation (without using expecation values)

• Fix U.export_to("path.png)" syntax
• Deepcopy gates in __iadd__ of QCircuit (#360)
• Simulation performance improvements (#359)
• Only apply keymap if necessary in simulate
• Simplify comparison and only calculate index bitstring when necessary in from_array
• Fix numbering_out parameter in initialize_bitstring and remove MSB2LSB/LSB2MSB keymap in from_array
• Optimize initialize_bitstring
• Update requirements.txt (no scipy version restriction, issue #361)
• rdm calculation more flexible (#363)
• Update version.py

RDM calculations:
calling the rdm function in the quantum chemistry module with evaluate=False gives back a tq.QTensor object
direct evaluation within compute_rdm is however faster (no repetitions in the simulation)

rdm1, rdm2 = mol.compute_rdms(U=U, evaluate=False)

Performance improvements @ohuettenhofer
see the original pr: #359
no syntax changes

Co-authored-by: Oliver Huettenhofer oliver.huettenhofer@gmail.com
Co-authored-by: Oliver Hüttenhofer 168852439+ohuettenhofer@users.noreply.github.com

v.1.9.6

New functionality in chemistry module, smaller bug fixes, minor changes.

New functionality in Chemistry Module:

Orbital Rotation Circuits

UR = mol.get_givens_circuit(spatial_orbital_transformation_matrix)

Optimized compilation of Jordan-Wigner UCC excitation gates

According to: Yordanov et. al.

Unitary Conversion between Bravyi-Kitaev and Jordan-Wigner

U = mol.transformation.me_to_jw()

Transform molecular RDMS

e.g. freeze orbital 1 (in JW) explicitly.

rdm1, rdm2 = mol.compute_rdms(..., rdm_trafo=tq.paulis.X([0,1])

Otherwise

• dropping GPyOpt support (not updated to dependencies/new python versions)
• Qiskit translation updated to current qiskit version.

individual PRs

• Fixing Pyscf_mol.from_tq() (#342)
• Fixing Pyscf_mol.from_tq()
• RDMs transformation (#341)
• rdms transformation
• rdm_trafo default from False to None
• fix U.export_to() personalized (#344)
• Add Givens Methods (#343)
• add automatic construction of orbital rotation circuits
• control not passed form QubitExcitation to QubitExcitationImpl (#346)
• fixing error in the initialization of binary hamiltonians closes #394 (#351)
• Fermionic Excitation Implementation (#350)
• Fermionic Excitation Implementation
• made indices in Fermionic excitations more consistent
• Update chemistry_tools.py
• Update qc_base.from tequila (#353)
• Update simulator_qiskit.py (#354)
  fixing u1, cu1 deprecation in qiskit
• quantumchemistry: added encoding transformations (#345)
• quantum chemistry: added encoding transformations
• Update CI
• updating qiskit noise imports to latest versions (#355)

---

Co-authored-by: JdelArco98 javierdelarcosantos@gmail.com
Co-authored-by: Phillip W. K. Jensen 46899159+pwkj@users.noreply.github.com
Co-authored-by: JdelArco98 francisco.del.arco.santos@uni-a.de
Co-authored-by: Deadly Artist 44524817+DeadlyArtist@users.noreply.github.com
Co-authored-by: Benjamin Meyer 46791542+benni-tec@users.noreply.github.com

v.1.9.5

Tequila Version 1.9.5

• orbital names are better tracked through transformations (#338)
• keep basis info when re-initializing with mol.from_tequila

Example (Gaussian Basis Set)

needs

pip install pyscf

geom = "H 0.0 0.0 0.0\nH 0.0 0.0 1.5"
mol = tq.Molecule(geometry=geom, basis_set="sto-3g")

mol.print_basis_info()

gives

basis_name       : sto-3g
orbital_type     : hf
orthogonal basis : False
basis functions  : 2
active orbitals  : [0, 1]
reference        : [0]
Current Orbitals
{idx_total:0, idx:0}
coefficients:  [0.63074567 0.63074567]
{idx_total:1, idx:1}
coefficients:  [ 0.82021585 -0.82021585]

change to "native orbitals", meaning in this case orthonormalized atomics

mol = mol.use_native_orbitals()
mol.print_basis_info()

gives

basis_name       : sto-3g
orbital_type     : orthonormalized-sto-3g-basis
orthogonal basis : False
basis functions  : 2
active orbitals  : [0, 1]
reference        : [0]
Current Orbitals
{idx_total:0, idx:0}
coefficients:  [ 1.02598473 -0.13397565]
{idx_total:1, idx:1}
coefficients:  [-0.13397565  1.02598473]

Using the orbital optimization routine will now set the orbital coefficients w.r.t the original basis

U = mol.make_ansatz(name="SPA", edges=[(0,1)])
opt = tq.chemistry.optimize_orbitals(molecule=mol, circuit=U)
mol2 = opt.molecule
mol2.print_basis_info()

basis_name       : sto-3g
orbital_type     : optimized
orthogonal basis : False
basis functions  : 2
active orbitals  : [0, 1]
reference        : [0]
Current Orbitals
{idx_total:0, idx:0}
coefficients:  [-0.63074597 -0.63074537]
{idx_total:1, idx:1}
coefficients:  [ 0.82021562 -0.82021608]

Example MRA-PNOs

MRA-PNOs from the madness module, need

pip install pyscf
conda install madtequila -c kottmann

geom = "H 0.0 0.0 0.0\nH 0.0 0.0 1.5"
mol = tq.Molecule(geometry=geom)

mol.print_basis_info()

basis_name       : mra
orbital_type     : pno
orthogonal basis : True
basis functions  : 2
active orbitals  : [0, 1]
reference        : [0]
Current Orbitals
{idx_total:0, idx:0, occ:2.0, pair:(0, 0)}
coefficients:  [1. 0.]
{idx_total:1, idx:1, occ:0.0425791, pair:(0, 0)}
coefficients:  [0. 1.]

MRA-PNOs are the native basis, so mol.use_native_basis() has no effect here. After calling the orbital-optimizer, coefficients of the optimized molecule are w.r.t the MRA-PNOs.

• fixing syntax issue in post_init of dataclass (#327)

• Support for phoenics optimizer dropped (dependency not maintained anymore and problems with downstream dependencies are piling up)

• more convenient randomization initialization for orbital optimizer (e.g initial_guess="near_zero" )

• Update qasm.py (#334, #335) Fixes issue #332

• added methods to create annihilation, creation, sz, sp, sm and s2 operators in qubit representation (#336)

ak = mol.make_annihilation_op(k) # spin-orbital k
ck = mol.make_creation_op(k)
ck = ak.dagger()
S = mol.make_s2_op() # total-spin operator
Sz = mol.make_sz_op() # spin-polarization
Nk = mol.make_number_op(k)

---

Co-authored-by: davibinco 59845652+davibinco@users.noreply.github.com

v.1.9.4

• fixing syntax issue in post_init of dataclass (#327)
• phoenics dropped due to maintenance resources
• more convenient randomization initialization for OO, avoiding numpy warnings

v.1.9.3

fixing issues with qubit encodings and orbital optimizations (#325)
Orbital optimizer was setting transformation in the molecule back to the default (JordanWigner)

v.1.9.2

Minor changes

• changed circuit init in adapt class (#319)
• added molecule_arguments explicitly to orbital_optimizer (#321)
• PR Silence PySCF (#322)

---

Co-authored-by: Davide Bincoletto davide@qalg031.informatik.uni-augsburg.de

v.1.9.1

• Minor Bug Fixes

• Update pyscf_interface.py

• no irreps in c1 (#314) (thanks @nysler)
• fixing issues with gradient printing in spsa (#316) (thanks @dariavh)

• fixing bug associated to qubit excitations with added controls (#317) (thanks Silvia Riera Villapun)

v.1.9.0

• orbital optimizer more flexible with regards to qubit encodings (#305)
  see https://arxiv.org/abs/2105.03836 for more on the "HCB" encoding
  orbital optimization with circuits that respect HCB encodings now around a factor of 2 faster.
  see tequilahub/quantum-valence-bond for an example in file h6_spa.py

Example:

import tequila as tq

mol = tq.Molecule(geometry="H 0.0 0.0 1.0\nH 0.0 0.0 2.0\nH 0.0 0.0 3.0\nH 0.0 0.0 4.0")
U = mol.make_ansatz(name="HCB-SPA")

opt = tq.chemistry.optimize_orbitals(mol, U, use_hcb=True)

• Structures for F3 circuit optimizations (#303)

• Adding linear depth F3 circuit

• Adding trotter error feature along testing data (#292)

• Adding trotter error feature along testing data

• iSWAP gate and Givens gate (#304)

• Implement iSWAP gate.

• Implement Givens gate and bugfix tests iSWAP.

• Remove iSWAP from Cirq simulator.

• Refactor GeneralizedRotation to generators with (possible) nullspace. (#306)

• Migrate shifted_gates method from QubitExcitation to GeneralizedRotation.

• Bugfix: list of GeneralizedRotationImpl.

• Bugfix: target order matters in QubitExcitation.

• Add check for p0 in GeneralizedRotation.

• SWAP gate initialization updated to follow conventions

• Refactor mapped_qubits to avoid duplicate code.

• added GenRot shortcut

• Bugfix: change API to modularized cirq package. (#308)

• Refactor circuit build to cirq_google module.

• Add check for cirq_google, add test.

• Update ci_backends.yml

• Some BugFixes (#311)

• UpCCGSD mix_sd fixed

---

Co-authored-by: Praveen Jayakumar praveen91299@gmail.com
Co-authored-by: Praveen Jayakumar praveen.jayakumar@mail.utoronto.ca
Co-authored-by: lamq317 lamq317@gmail.com
Co-authored-by: Daria Van Hende 33431368+dariavh@users.noreply.github.com
Co-authored-by: JdelArco98 104641558+JdelArco98@users.noreply.github.com

v.1.8.9

• better messages for madtequila (#291)

• qubit encodings consistency (#294)

• more consistency in HCB approximation and SPA wavefunctions (#295)

• more consistency in HCB approximation and SPA wavefunctions

• keeping up to date with pyscf and setting parse_arg=False in mol constructor (mainly blocks pytest commands)

• added plot2cube support to madness interface (#296)

• Update madness_interface.py

• dropping noisy simulation support in qulacs -- no longer maintained

• fixing small issue in tests regarding scipy 1.11 release

• adding args/kwargs to psi4.compute_rdms function

• adding return to call of base class in psi4.compute_rdms function

# create cube files form madness orbitals
mol = tq.Molecule(geometry="myfile.xyz")
mol.plot2cube(orbital=2) # plots active orbital 2 to a cube file

• preparing for hcb merge (#293)
  mol.compute_rdms(use_hcb=True) is now enabled for spin-free matrices. Allows to compute RDMs with half the qubits (given that the circuit is in HCB encoding).
• Implementing HCB rdm on general compute_rdms()
• consistency in rdm computation with hcb for reordered transformations
• fixes hcb_rdms and Tests rdms_hcb

---

Co-authored-by: Javier del Arco javierdelarcosantos@gmail.com
Co-authored-by: J. S. Kottmann jakob.kottmann@gmail.com

• enabled HCB in orbital optimization, can be done via tq.chemistry.opt… (#297)
• enabled HCB in orbital optimization, can be done via tq.chemistry.optimize_orbitals(...,use_hcb=True)

# orbital optimization with hardcore-boson circuits
U = mol.make_ansatz("HCB-UpCCD")
opt = tq.chemistry.optimize_orbitals(circuit=U, molecule=mol, initial_guess=guess, use_hcb=True)

• small issue in consistency test, silenced unnecesarry warning
• QASM string parsing bug (#298)

Co-authored-by: Praveen Jayakumar praveen.jayakumar@mail.utoronto.ca

• Update requirements.txt
• Fix NumPy float and int (#301)

---

Co-authored-by: JdelArco98 104641558+JdelArco98@users.noreply.github.com
Co-authored-by: Javier del Arco javierdelarcosantos@gmail.com
Co-authored-by: Praveen Jayakumar praveen91299@gmail.com
Co-authored-by: Praveen Jayakumar praveen.jayakumar@mail.utoronto.ca
Co-authored-by: Erik Kjellgren erikkjellgren@live.dk

v.1.8.8

Improvement on Measurement Optimization (Seonghoon Choi @schoi839 & Aranya Chakraborty @Aranya3003 ):
Addition of techniques from https://doi.org/10.22331/q-2023-01-03-889 (Izmaylov Group)
PR authored by: Seonghoon Choi and Aranya Chakraborty

• Completed SVD (commit on behalf of Aranya Chakraborty).

• Completed FFF (commit on behalf of Aranya Chakraborty).

• Improved the efficiency of F3.

• Truncated CISD containing only a few slater determinant terms is usedinstead of the full CISD.

• F3 is performed only on a few large variance fragments.

• Safer choice of minimum meas_alloc (1e-6) to avoid issues with allocating 0 shots.

• Addressing minor comments.

• Adding tests for Fermionic measurement optimization schemes.

• Returning rotated (cartan form) obt and tbts after F3.

• Changed OSI to ICS for consistency.

• Circuit for fermionic measurement techniques:

• Added circuit implementations of orbital rotations

• Added test for orbital rotations.

• Proper handling of non-symmetric fermionic Hamiltonian (happens when one obtains it from reverse_jordan_wigner of a qubit Hamiltonian).

• Handling options in compile_groups to better deal with exceptions and
  default options.

• get_fermionic_wise now correctly returns QubitHamiltonian rather than
  openfermion QubitOperator.

• If suggested samples = 0, at least 1 sample (shot) is allocated for
  that measurable fragment.

---

• Update psi4_interface.py
  removed compute_x_body_integral functions as this migrated to qc_base
• Update ci_pyquil.yml
  deactivating for now, issues with forest-sdk docker file
• Update pyscf_interface.py
  allow charged molecules in pyscf backend

---

• allow molecule construction with basis= along with basis_set= as this was a common issue

---

• adding repr method to Variables class for easier serialization and evaluation

---

• made autograd the default in requirements -- less issues on M1/M2 chips and windows
• provided more information in autograd_imports

---

allow qpic export from circuit without having to specify the filename keyword explicitly

Co-authored-by: Aranya Chakraborty aranyac@iisc.ac.in
Co-authored-by: Seonghoon Choi seonghoon.choi@utoronto.ca
Co-authored-by: J. S. Kottmann jakob.kottmann@gmail.com