Quax
A high-performance quantum information science library built on top of JAX.
Documentation
Features
- Quantum Objects: States, gates and superoperators objects are defined to allow natural manipulations and operations.
- Clear typing: Standard objects such as Unitaries, Chois and Density matrices are all typed, clarifying the nature of various objects.
- Standard operators composition/application
@, tensor products|, scalar multiplication*and powers*are defined on all quantum objects. - Automatic promotion Pure states and operators are automatically promoted to mixed states and superoperators when appropriate.
- Quantum instruments Mid-circuit measurements are modeled with
QuantumInstrument, supporting confusion/transition matrices, composition, and tensor products. - Qudit support Operations on d-dimensional qudits are supported.
- Batch support Operating on batches or ensembles of states is supported for straightforward parallelization.
Installation
pip install rigetti-quax
Quick Example
import jax
import jax.numpy as jnp
import quax as qx
# Create a 2-qubit state
psi_0: qx.StateVector = qx.zero_state_vector(dims=(2, 2,))
# Apply gates to prepare a pure Bell state
psi = (qx.gates.H | qx.gates.I) @ psi_0
psi = qx.gates.CNOT @ psi
# Generate an ensemble of Lindbladians with varying strenght
L: qx.Lindbladian = qx.lindbladians.amplitude_damping(jnp.linspace(0.0, 0.1, 10))
# Combine the Lindbladians with the CNOT unitary to create an ensemble of quantum channels
# The unitary is automatically promoted to a superoperator to support the addition of the Lindbladian
noisy_cnot: qx.SuperOp = qx.gates.CNOT + (L | L)
# Apply the noise operation to create a noisy Bell states
rho: qx.DensityMatrix = noisy_cnot @ (qx.gates.H | qx.gates.I) @ psi_0
# Compute the fidelity between the noisy Bell state and the ideal Bell state
fidelity: jax.Array = qx.fidelity(rho, psi)
# Now let's apply a qutrit gate to the ensemble of noisy Bell states.
rho = (qx.gates.TRX12(jnp.pi) | qx.gates.I) @ rho
# We can estimate the 𝜆8 observable
obesrvables: jax.Array = qx.estimate(rho, observable=(qx.gates.GELLMANN8) | qx.gates.I)
Acknowledgements
Quax draws inspiration, educational material, and some code from forest-benchmarking, Rigetti's open-source library for quantum characterization, verification, and validation. We gratefully acknowledge the forest-benchmarking contributors for their foundational work on superoperator representations, quantum channel conventions, and distance metrics.
License
Copyright 2026 Rigetti & Co, LLC. Licensed under Apache License 2.0.
1 maintainer
Metadata
1 maintainer
Release files for rigetti-quax 0.7.5
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