Qibo 0.1.3

What's Changed

• Fix issue with tf slicing (#345) @stavros11
• Hamiltonian expectation for density matrices (#344) @stavros11
• Measurement fixes (#325) @stavros11
• Fix controlled by Y gates for custom backend (#343) @stavros11
• Metropolis algorithm for sampling shots (#332) @stavros11
• Speeding up Metropolis for frequency (#338) @scarrazza
• Move state reshape in gates (#340) @stavros11
• Add nshot switcher (#341) @scarrazza
• PartialTrace gate for density matrices (#335) @stavros11
• Fixing circuit.draw misalignment (#334) @scarrazza
• Fix gap callback for degenerate Hamiltonians (#329) @stavros11
• Fix einsum in density matrix traceout (#328) @stavros11
• Make DistributedState custom operator free (#323) @stavros11
• adding Windows support (#316) @scarrazza
• Fix old tests for Windows (#319) @stavros11
• Detach custom operators (#317) @scarrazza
• Fix custom operator imports in tests (#318) @stavros11
• upgrading to tf 2.4.1 (#315) @scarrazza
• State abstraction (#314) @stavros11
• MaxCut Hamiltonian (#311) @scarrazza
• Symbolic Hamiltonian fixes (#312) @scarrazza
• Tests that run without Tensorflow (#310) @stavros11
• Circuit viewer (#308) @scarrazza
• small fixes (#307) @scarrazza
• Backend abstraction (#303) @stavros11
• Parallel circuit evaluation (#304) @scarrazza
• custom initial_state (#305) @scarrazza
• custom initial_state GPU (#306) @scarrazza
• Documenting custom VQC optimizations (#298) @scarrazza
• Updating wheels with cuda 11 (#301) @scarrazza
• Upgrading tf to 2.4.0 (#280) @scarrazza
• Create base callbacks (#296) @stavros11
• Fix test failure on GPU for parallel lbfgs (#297) @scarrazza
• Trainable flag for parametrized gates (#294) @stavros11

Qibo 0.1.2

Major New Features

• Collapse gate.
• Shor (2n+3) example.
• qPDF model and example.
• Density matrix simulation using custom operators.
• Post-measurement bit-flip errors.
• Thermal relaxation error channel.
• Parallel optimization using multiprocessing for L-BFGS-B on CPU.
• Improved performance when repeating circuit execution.
• Replacing TensorFlow ThreadPool with OpenMP for custom operators on CPU.
• General code upgrades including tests, wheels and documentation.

Fixes

• Cost function for autoencoder tutorial.
• Circuit depth calculation.
• Backend return name.
• Trotter Hamiltonian from_symbolic and make_compatible.
• Scipy missing requirement in pip package.

Qibo 0.1.1

Major Features

• Implemented new entaglement spectrum callback
• Extended circuit summary, fixed circuit depth definition.
• New method for circuit inversion
• New general unitary gates.
• Updating QASM and testing its compatibility.
• Adding possibility to add circuits to larger ones.
• Including symbolic interface for Hamiltonian allocation.
• Upgraded TensorFlow pip dependency to 2.3.1
• Updated documentation, fixed typos.
• Adjusting documentation urls to stable.

Qibo 0.1.0

Release 0.1.0

First Qibo stable release.

Major Features

• Basic circuit model containing gates and/or measurements (Circuit).
• Circuits that can be executed on multiple devices such as CPU/GPUs (DistributedCircuit).
• Circuit implementing the Quantum Fourier Transform (QFT).
• Variational Quantum Eigensolver (VQE), with support for optimization of the variational parameters.
• Quantum Approximate Optimization Algorithm (QAOA), with support for optimization of the variation parameters.
• Unitary time evolution of quantum states under a Hamiltonian (StateEvolution).
• Adiabatic time evolution of quantum states, with support for optimization of the scheduling function (AdiabaticEvolution).

Qibo 0.0.1b5

Documentation cleanup, further optimization.

Qibo 0.0.1b4

Pre-release for testing.

Qibo 0.0.1b3

Pre-release for testing.

• adiabatic evolution algorithms
• code optimization and acceleration
• advanced tutorials and examples
• linux wheels are compiled with CUDA 10.1 and manylinux2010 support.

Qibo 0.0.1b2

Pre-release for testing.

• multi-gpu support
• single package with cuda10.2 and cpu-only support
• new hamiltonian overloading operators
• decomposition of multi-controlled X gates
• options to set default simulation precision, backend and device
• enhanced interface for gate matrices
• pylint errors fixed
• fixed checks for custom operators

Linux wheels are compiled with CUDA 10.2 support.

Qibo 0.0.1b1

Pre-release for internal testing.