Release v5.0.0 · Budapest-Quantum-Computing-Group/piquasso

What's Changed

get_purity in *FockState for calculating the purity.
PostSelectPhotons and ImperfectPostSelectPhotons for PureFockSimulator and
SamplingSimulator.
Beamsplitter5050 support.
SamplingState.state_vector, analog of *FockState.state_vector.
JAX support for SamplingSimulator.
Support for multiple occupation numbers in SamplingSimulator.
PureFockState.get_particle_detection_probability_on_modes, which is similar to
get_particle_detection_probability, but for the specified modes.
HomodyneMeasurement support for PureFockSimulator.
cvqnn.get_cvqnn_weight_indices is created, which enables slicing of the weights when
needed.
PureFockState.variance_photon_number for calculating the variance of the photon
number operator.
Partial JAX support for GaussianSimulator.
GaussianState.get_threshold_detection_probability.
Python 3.12 support.
Support for ParticleNumberMeasurement in GaussianSimulator with the config
use_torontonian=True and displaced Gaussian states.
Config.validate flag. If set to validate=False, validations are skipped, possibly
enabling minor speed-up or JIT compilation.
piquasso.fermionic package with support for fermionic Gaussian states.
Support for differentiable GaussianState.get_particle_detection_probability.

Simulator.execute with initial_state specified while using tf.function.
GaussianSimulator random number generation from Config.rng.
Error message formatting in Simulator.
Beamsplitter default parameters.
fock_probabilities differentiability in PureFockSimulator.
SamplingState.fock_probabilities returns with probabilities corresponding to all
particle number sectors.

Delete unused attributes in SamplingState.
Clements decomposition rewritten.
The original RNG is kept when a Config is copied. This is done to prevent unexpected
behaviour with seeded calculations.
The config variable Config.normalize is deleted. For the same result, one can call
State.normalize at the end of the calculations.
Simulator._default_calculator_class initial value got deleted to avoid confusion.
Renamed Calculator to Connector and corresponding names containing the term
calculator, referring to the original Calculator class (e.g.,
_default_calculator_class -> _default_connector_class).
BaseConnector (former BaseCalculator) rewritten as an abstract class.
Added/updated __repr__ methods for all classes in the Piquasso API.

Hafnian, loop hafnian, torontonian and permanent implementations replaced with faster
implementations. The torontonian calculation is written in C++, and is distributed in
the wheels alongside the Python code.
Faster FockState.norm.
Faster SamplingState.get_particle_detection_probability.
JIT compilation of passive linear gates in *FockSimulator.
Common Fock-space related calculations got rewritten, JIT compilation enabled.
More efficient sampling algorithms for BS and GBS simulations.

Full Changelog: 4.0.0...v5.0.0