qoro-maestro-pyscf 0.3.0

PySCF integration plugin for the Maestro GPU quantum simulator by Qoro Quantum

qoro-maestro-pyscf

PySCF integration plugin for the Maestro GPU quantum simulator by Qoro Quantum.

Run quantum chemistry VQE calculations on Maestro's GPU-accelerated backends.

Installation

pip install qoro-maestro-pyscf

Quick Start — CASCI with VQE

from pyscf import gto, scf, mcscf
from qoro_maestro_pyscf import MaestroSolver

mol = gto.M(atom="H 0 0 0; H 0 0 0.74", basis="sto-3g")
hf  = scf.RHF(mol).run()

cas = mcscf.CASCI(hf, 2, 2)
cas.fcisolver = MaestroSolver(ansatz="uccsd")
cas.run()

GPU MPS Mode (Larger Active Spaces)

cas.fcisolver = MaestroSolver(
    ansatz="hardware_efficient",
    ansatz_layers=3,
    simulation="mps",         # Matrix Product State on GPU
    mps_bond_dim=128,
)

GPU Setup & Licensing

Maestro GPU simulation requires an NVIDIA GPU and a license key from Qoro Quantum. Three ways to provide your key:

Option 1 — Pass directly to the solver:

cas.fcisolver = MaestroSolver(
    ansatz="uccsd",
    license_key="XXXX-XXXX-XXXX-XXXX",
)

Option 2 — Set it once in your script:

from qoro_maestro_pyscf import set_license_key
set_license_key("XXXX-XXXX-XXXX-XXXX")

Option 3 — Environment variable (recommended for production):

export MAESTRO_LICENSE_KEY="XXXX-XXXX-XXXX-XXXX"

Note: First activation requires an internet connection (one-time). After that, the license is cached locally for offline use. No GPU? The solver automatically falls back to CPU.

Migrating from Qiskit

qiskit-nature-pyscf	qoro-maestro-pyscf
from qiskit_nature_pyscf import QiskitSolver	from qoro_maestro_pyscf import MaestroSolver
cas.fcisolver = QiskitSolver(algorithm)	cas.fcisolver = MaestroSolver(ansatz="uccsd")
Requires Qiskit, qiskit-nature, qiskit-algorithms	Zero Qiskit dependencies
CPU-only estimator	GPU-accelerated (CUDA)
Statevector only	Statevector + MPS

Features

• GPU-accelerated statevector & MPS simulation via Maestro's CUDA backend
• Automatic GPU→CPU fallback when no GPU is available
• Drop-in PySCF solver — implements the full fcisolver protocol (kernel, make_rdm1, make_rdm1s, make_rdm12, make_rdm12s)
• CASCI and CASSCF support (CASCI recommended; CASSCF works but VQE convergence can be tricky in the macro-iteration loop)
• Multiple ansatze — hardware-efficient, UCCSD, and UpCCD (paired doubles for singlet states)
• UHF support — handles spin-unrestricted integrals

Architecture

qoro_maestro_pyscf/
├── maestro_solver.py   # MaestroSolver — PySCF fcisolver drop-in
├── hamiltonian.py      # PySCF integrals → QubitOperator (Jordan-Wigner)
├── ansatze.py          # HF initial state, hardware-efficient, UCCSD, UpCCD
├── expectation.py      # Maestro circuit evaluation wrapper
├── rdm.py              # RDM reconstruction from VQE circuit
├── properties.py       # Dipole moments, natural orbitals
└── backends.py         # GPU/CPU/MPS backend configuration

Dependencies

Package	Purpose
qoro-maestro	Quantum circuit simulation (GPU/CPU)
pyscf	Molecular integrals & classical reference
openfermion	Jordan-Wigner mapping & RDM operators
scipy	Classical parameter optimisation

Examples

See the examples/ directory for 9 worked examples and a full workflow notebook covering H₂ dissociation, LiH UCCSD, GPU benchmarking, MPS bond dimensions, CASSCF, NEVPT2, dipole moments, geometry optimisation, and UpCCD paired doubles.

License

Apache 2.0 — see LICENSE for details.