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Changelog

[6.2.0] - 2025-09-03

Added

  • Result.get_counts method for showing repetitions in the obtained samples.
  • dask support for Gaussian Boson Sampling.
  • State vector display with occupation numbers using fock_amplitude_map.

Fixed

  • Handling number of modes mismatch in Simulator.execute.
  • Typos in the documentation corrected.
  • Instruction mode validation improved for caching invalid indices.
  • Jupyter notebook download issue in the documentation.
  • Unnecessary singularity check deleted in Graph.

[6.1.0] - 2025-06-23

Added

  • Fermionic GaussianHamiltonian support for subsystem.
  • The analog of the Squeezing2 gate in the fermionic setting.
  • Fermionic ControlledPhase gate.
  • Fermionic Ising XX coupling gate.
  • Fermionic PureFockState.fock_probabilities_map.
  • get_marginal_fock_probabilities methods for GaussianState, FockState and PureFockState for calculating the marginal particle detection probabilities.
  • The SamplingState.get_particle_detection_probability method is made differentiable via JAX.
  • Support for nested program definitions.
  • GaussianState.get_xp_string_moment for calculating higher XP-string moments for Gaussian states.
  • fock_amplitudes_map method for FockState, PureFockState and BatchPureFockState, a defaultdict containing the probability amplitudes, indexed by tuples of occupation numbers on each mode.
  • Support for Python 3.13.
  • plot_wigner method for FockState, PureFockState and GaussianState, which can be used to visualize the marginal Wigner function on a single mode.

Fixed

  • JAX has been mistakenly loaded when importing Piquasso, but has been fixed in this release.
  • Numba reflected list warning got removed.
  • Some typos in the documentation got fixed.
  • Pfaffian, torontonian and loop torontonian precision type is fixed.

Performance improvements

  • Pfaffian got reimplemented in C++ using the Parlett-Reid algorithm.
  • SLOS_full algorithm implemented for state vector calculation in SamplingState.
  • Permanent function got reimplemented in C++ using the algorithm described in https://arxiv.org/abs/2309.07027.

[6.0.0] - 2025-03-26

Added

  • Minimal fermionic.PureFockSimulator implementation.
  • GaussianState.get_purity() function for calculating Gaussian state purity.

Fixed

  • Passive linear operations in fermionic.GaussianSimulator time evolution direction.

Breaking changes

  • Majorana operator ordering changed in piquasso.fermionic package.
  • Phaseshifters are commuted to the end of the circuit in the Clements decomposition.

[5.0.1] - 2024-10-06

Fixed

  • Windows binary wheel packaging.

[5.0.0] - 2024-10-01

Added

  • 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.

Fixed

  • 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.

Breaking changes

  • 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.

Performance improvements

  • 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.

[4.0.0] - 2024-02-29

Added

  • Python 3.11 support.
  • Purification of Gaussian states.
  • PureFockState.get_tensor_representation for embedding the state vector into a tensor with rank equal to the number of modes.
  • Batch processing of pure Fock states.
  • CVQNN module.
  • Support for tf.function in PureFockSimulator.
  • Supporting JAX in PureFockSimulator.

Fixed

  • Error in custom gradient of passive linear gates in PureFockSimulator.

Breaking changes

  • Python 3.7 support dropped.
  • TensorflowPureFockSimulator has been deleted. Instead, one can use PureFockSimulator with TensorflowConnector specified.
  • Printing format of Fock states have been changed.
  • Renamed _state_vector to state_vector.

[3.0.0] - 2023-10-23

Added

  • dtype configuration variable in Config to set precision of calculations.
  • Kerr gate calculation in PureFockSimulator performance improved.
  • Gradient calculation in TensorflowPureFockSimulator got improved.
  • A method called PureFockState.mean_position which calculates the average position in a specified mode.
  • normalize configuration variable in Config to enable/disable normalization of states PureFockSimulator and FockSimulator.

Changed

  • Displacement parametrization is simplified.
  • The autoscaling of single mode gates got deleted.

Fixed

  • Vacuum state typing issue fixed in PureFockSimulator.
  • Calculation error during gradient calculation.

[2.2.0] - 2023-03-07

Changed

  • Several major performance improvements got implemented in TensorflowPureFockSimulator.

Fixed

  • quantum-blackbird version got bumped for numpy compatibility.
  • Kerr gate was applied with a wrong equation, it got corrected.
  • Typing error was fixed when applying Interferometer in TensorflowPureFockSimulator.

[2.1.0] - 2023-02-08

Added

  • Performance increase for the PureFockSimulator and TensorflowPureFockSimulator.

Fixed

  • GaussianState.fidelity gave incorrect results for multiple modes and it needed to be corrected.
  • During Williamson decomposition, sometimes scipy.linalg.sqrtm returned with complex matrices instead of real ones which caused problems so it is manually casted to real.
  • In TensorflowPureFockSimulator, the gradient of the displacement gate matrix was not applied properly to the upstream gradient, a conjugation is added.
  • Using TensorflowPureFockSimulator, the input of the Interferometer gate was not converted to a tensorflow.Tensor automatically, which has been included.

[2.0.0] - 2022-10-30

Added

  • A simulator class called TensorflowPureFockSimulator, which uses Tensorflow and is able to calculate gradients.

Changed

  • By enabling Tensorflow support, we dropped support for customizing the permanent, hafnian and loop hafnian calculations through Config.

[1.0.1] - 2022-09-05

Fixed

  • SamplingSimulator along with Loss using uniform transmissivity (transmittance) parameters and ParticleNumberMeasurement produced only-zero samples instead of the expected samples.

[1.0.0] - 2022-04-26

Added

  • Support for Attenuator in FockSimulator and PureFockSimulator.
  • LossyInterferometer channel for SamplingSimulator.
  • Possibility to provide the hafnian as a function in piquasso.Config.

Changed

  • The occupation number order has been changed from lexicographic to anti-lexicographic.
  • The piquasso.api.errors module got renamed to piquasso.api.exceptions.
  • The Sampling measurement class has been unified with ParticleNumberMeasurement.

Fixed

  • Kerr gate calculations were incorrect for multiple modes in FockSimulator and PureFockSimulator.
  • Calculations that were incorrect for multiple modes using FockSimulator along with Squeezing, Displacement or CubicPhase.
  • Symmetric tensorpower ordering in Fock-backend simulations.
  • Handling 0 matrix elements at Clements decomposition.