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Change Log

All notable changes to this project will be documented in this file. This project adheres to Semantic Versioning.

[ 0.7.0 ] - [ 2024-04-17 ]

Added

  • Integrate with libqasm 0.6.3 release.

Changed

  • Rename tests folder to test.
  • Update GitHub workflows.

Removed

  • cQasm 1.x support.
  • circuits folder.

[ 0.6.5 ] - [ 2023-11-13 ]

Added

  • Python 3.12 support.

Changed

  • Uses Conan.
  • New GitHub workflows.
  • Working ARM runners in the CI.

Removed

[ 0.6.4 ] - [ 2023-09-21 ]

Added

  • Meaningful error message when parsing or simulation fails.

Changed

  • Does not crash when too many qubits asked.

Removed

[ 0.6.3 ] - [ 2023-09-19 ]

Added

  • Address sanitizer CMake mode.

Changed

  • Removed submodules and deps folder, replaced with CMake FetchContent.
  • C++23.
  • gtest instead of doctest.
  • Various fixes to GitHub actions.
  • Fixed bug in bitset due to bool automatic casting to 32 bits.
  • Documentation formatting fixes.
  • Doc chapter about internals.

Removed

[ 0.6.2 ] - [ 2023-02-21 ]

Added

  • depolarizing_channel error model and docs.
  • Ability to pass constant seed for deterministic simulation.
  • RandomTest doing Kolmogorov-Smirnov statistical test to match random numbers with their ideal probability distribution.

Changed

  • Fixed docs.
  • Source files use .hpp/.cpp extensions.
  • Random number distributions (integer min/max and real 0-1) are done in-house for portability and consistency of results.

Removed

[ 0.6.1 ] - [ 2023-02-01 ]

Added

  • Linux arm64 Python wheel and Linux arm64 test workflow (GCC-Release).
  • classical not gate is back.
  • state section in JSON now contains a new entry norm which is the square of the modulus of the complex number.
  • C++ integration test.
  • All gates can be controlled (including prep, measure). This is not new but was accidentally removed in 0.6.0.
  • New Python API execute_string and execute_file without having to create qxelarator.QX() and returning user-friendly Python type.

Changed

  • Fixed README.
  • results section in JSON contains integers instead of floats (those integers being the number of occurrences).
  • In relation to previous point, results only relates to measurement register averaging, and no longer to quantum state when doing a single shot. For that, use the "state" section in the JSON.
  • Output float precision is 8 decimals instead of 6.

Removed

  • Most Python tests. Already covered in C++ integration test, and they didn't check much anyway.

[ 0.6.0 ] - [ 2023-01-19 ]

Almost a complete rewrite. No functional change except it's faster.

Added

  • Ability to easily implement any quantum gate by simply giving an arbitrary unitary matrix in Gates.h.
  • Performance speedup using a single thread.
  • Some proper linear algebra primitives using template metaprogramming.
  • abseil-cpp dependency for flat_hash_map.
  • Ability to compile the simulator with a maximum number of qubits. In the future this will be using templates as well to switch data structures based on the input quantum circuit.

Changed

  • Quantum state is stored as a sparse array implemented using a flat_hash_map from abseil-cpp.
  • C++20 in place of C++14.
  • Code style: camel case.

Removed

  • OpenMP and multithreading.
  • SSE, AVX and other intrinsics.
  • get_measurement_outcome and get_state methods. Now accessible via JSON output.

[ 0.5.5 ] - [ 2023-01-12 ]

Added

  • set_string method to parse a cQASM string directly instead of a cQASM file.

Changed

  • Fixed issue #118: quantum state is always displayed, as well as measurement register averaging.

Removed

[ 0.5.4 ] - [ 2023-01-06 ]

Added

  • Tests for measure gate.

Changed

  • Fixed issues #91 and #114.
  • As part of #114, switch to sequential/simple measure gate.

Removed

  • QFT implementation (never instantiated, so no functional change).
  • qx-server no longer exists, together with the network libraries.
  • "Microcode" generation functions (never used either).
  • Parallel gates in gate.h (they were executed sequentially).
  • Some non-needed and/or obsolete code.

[ 0.5.3 ] - [ 2023-01-02 ]

Added

  • Python 3.11 support.

Changed

Removed

[ 0.5.2 ] - [ 2022-12-7 ]

Added

Changed

  • Fixed version number incorrectly set in previous release.

Removed

[ 0.5.1 ] - [ 2022-12-6 ]

Added

  • ReadTheDocs documentation.

Changed

  • Fixed Python versions on Linux.
  • Updated README with new API functions.
  • Tidy tests and circuits folder.

Removed

  • Python 3.6 support.

[ 0.5.0 ] - [ 2022-11-15 ]

Added

  • -j <filename> CLI option to output JSON to a file.
  • Possible to use the simulator without OpenMP.

Changed

  • measure_all gate added. Does no longer measure each qubit separately.
  • Move to C++11: smart pointers, etc.
  • Format of output has been changed. You no longer need to add a display gate to output the quantum state at the end of the circuit.
  • Now uses the new libqasm API instead of the old one.
  • Output complex amplitudes when not averaging measurement register.
  • Do not add automatically a measure_all when doing measurement averaging. Average the measurement register only.

Removed

  • Most preprocessor macros. E.g., for gate creation.
  • A lot of old and useless code was removed. A lot of dead code removed.

Fixed

  • Close input file when done.
  • Code style has been completely fixed automatically with clang-format.
  • Headers no longer include .cc file.
  • Moved implementations to .cc files instead of headers.

[ 0.4.2 ] - [ 2021-06-01 ]

Added

Changed

Removed

Fixed

  • Wheels no longer require exotic CPU extensions to work.

[ 0.4.1 ] - [ 2021-05-20 ]

Added

  • Continuous integration for as far as automated tests exist.
  • Automated release build and distribution logic for PyPI.
  • Installation logic in build system.
  • qxelarator wheels include qx-simulator binary (and friends).

Changed

Removed

Fixed

  • Build on MacOS.
  • Build on Windows using MSVC.
  • Python build process on various platforms.

[ 0.4.0 ] - [ 2021-05-20 ]

Added

Changed

  • Replaced XPU-based threading with OpenMP.

Removed

Fixed

  • Various bugs and inefficiencies related to multithreading.

[ 0.3.0 ] - [ 2019-05-01 ]

Added

  • qxelerator to support cqasm v1.0.
  • setup instructions in README.md.

Changed

Removed

Fixed

[ 0.2.5 ] - [ 2018-12-21 ]

Added

Changed

Removed

Fixed

  • Fixed issue with libqasm submodule, this release is now with the correct version.

[ 0.2.4 ] - [ 2018-12-14 ]

Added

Changed

Removed

  • Removed -u 0 in Jenkins file again.

Fixed

  • Single qubit operations now accept integers as arguments, previously it required floats.

[ 0.2.3 ] - [ 2018-11-05 ]

Added

Changed

  • Updated the libqasm to get the hotfix.

Removed

Fixed

  • Fixed pthread mutex locking bug in XPU worker.

[ 0.2.2 ] - [ 2018-09-25 ]

Added

Changed

Removed

Fixed

  • Fixed bug in measurement and preparation implementation for large number of qubits.
  • Fixed verbose GNU Compiler warnings under Linux.

[ 0.2.1 ] - [ 2018-09-04 ]

Added

  • Enabled quantum noise simulation using the Depolarizing Error Model.
  • Added multi-shot simulation mode to save simulation time on the Quantum Inspire web platform.
  • Enabled Identity gate support.

Changed

Removed

Fixed

[ 0.2.0 ] - [ 2018-08-23 ]

Added

  • Initial cQASM 1.0 support.
  • Integrated with libqasm 0.1.1 release.
  • Added support for new quantum gates:
    • Flexible controlled phase shift (CR and CRK)
    • Measurement and Preparation in X/Y/Z basis: added measure_x, measure_y, prep_x and prep_y.
  • Added support for Single Gate Multiple Qubits (SGMQ).
  • Added a new set of unit tests.

Changed

  • Re-implemented classical NOT gate for full binary-controlled gate support.

Removed

Fixed

  • Fixed overflow bug when simulating more than 31 qubits.
  • Fixed bug in qubit register measurement ("measure_all" instruction).