thewalrus 0.15.0

Version 0.15.0

on Python PyPI

New features

• Adds the function random_banded_interferometer to generate unitary matrices with a given bandwidth. #208

• Adds the function tvd_cutoff_bounds to calculate bounds in the total variation distance between a Fock-truncated and an ideal GBS distribution. #210

• Adds function for calculating threshold detection probabilities for Gaussian states with displacement. #220

• Adds new functions total_photon_number_distribution and characteristic_function to study properties of the total photon number distribution of a k identical lossy squeezers. #230

• Adds new functions xxpp_to_xpxp and xpxp_to_xxpp in the symplectic module to swap the ordering of the quadrature operators in vectors and matrices. #237

Improvements

• The hafnians and loop hafnians of diagonal matrices are now calculated in polynomial time. #212

• Refactors setup.py to avoid issues with CFLAGS. #229

• The fidelity function in quantum/gaussian_checks.py is rewritten to add clarity. #226

• Simplifies logic of normal_ordered_expectation by removing mutually cancelling np.conj. #228

Bug fixes

• Removes unnecessary np.real_if_close statements in quantum/fock_tensors.py causing the probabilities to not be normalized. #215

• Fixes the prefactor in pure_state_amplitude. #231

Contributors

This release contains contributions from (in alphabetical order):

Jack Brown, Jake Bulmer, Rachel Chadwick, Stefano Paesani, Nicolas Quesada