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CHANGELOG.md

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Changelog

[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.