v0.12.2 - The Bleeding Lance

Improvements

• Detector simulation now uses the optional progress callback
• Renamed JobGroup method list_unfinished_jobs to list_unsuccessful_jobs for clarity
• Removed a warning which always occurred when injecting noise in a converter

Bug fixes

• Fixed post-selection conditions composition in converters
• Fixed heralds display in highly nested circuits
• Fixed JobGroup not saving the refreshed jobs status in a parallel run

v0.12.1 - The Bleeding Lance

New features

• A KL divergence method to compare two distributions.
• Two methods that reduce the number of states in a BSDistribution to help comparing distributions.
• A qloq ansatz in the catalog to help building ansatz with qudit encoding.
  See https://perceval.quandela.net/docs/v0.12/notebooks/QLOQ_QUBO_tutorial.html

Improvements

• The catalog now includes usual 1-qubit gates.
• The CircuitOptimizer can now ignore columns of the unitary given a list of modes that won't receive input photons.
• Perceval's Qiskit bridge is now using Qiskit 1.3.1
• Feed-forward simulation is now faster when using heralds.
• Noisy input state generation is now faster and is now only dependant on the number of photons.

Bug fixes

• LC and TD simulation now succeed if there are empty modes at the end of the Processor.
• Fixed performance computation when using LC and TD.
• Fixed potentially wrong results when using several layers of feed-forward.
• The Sampler iterator no longer need heralded modes to be defined in the input state.
• Fixed a crash when trying to display a circuit having empty sub-circuits.

You can contact us on the Perceval forum

v0.12.0 - The Bleeding Lance

New features

• Feed-forward local simulation
  You can now build a Processor containing detectors and feed-forward controllers configuring unitary circuits and obtain strong simulation results!
  See: https://perceval.quandela.net/docs/notebooks/Quantum_teleportation_feed_forward.html
  See also: https://perceval.quandela.net/docs/reference/feed_forward_configurator.html

• Detector imperfections can now be simulated.
  Four different types of detectors are currently supported:

  • Photon number resolving (PNR) perfect detectors,
  • Threshold detectors,
  • Interleaved pseudo-PNR detectors,
  • Pseudo-PNR detectors using layers of beam splitters and threshold detectors.

• A new job management system helps you group jobs, check statuses and retrieve results.
  See: https://perceval.quandela.net/docs/reference/job_group.html

• A new strong simulation back-end is available: SLAP.
  See: https://perceval.quandela.net/docs/backends.html#slap

• New usage example - Quantum kernel methods
  See: https://perceval.quandela.net/docs/notebooks/quantum_kernel_methods.html

• Resource estimator for gate-based conversion, supporting dual rail and qudit encodings.

• A TVD function between probability distributions.

Improvements

• Perceval now supports Python 3.13.
• PostSelect syntax now supports nested logical expressions of 'and', 'or', 'xor' and 'not' operators.
• Gate-based circuits to linear optics converters now save heralded photons (by using as many post-selected CNOT as possible).
• Strong simulation now automatically uses heralds to mask the Fock space when possible, saving computation time and memory.
• Failed and cancelled jobs may now be programmatically restarted.
• Barrier components can now be invisible (used only for alignments).
• Improved circuit rendering.
• DisplayConfig enabling to select a rendering skin can now be persistent.
• Modernized some example notebooks.

Bug fixes

• Tensor product between BasicState and SVDistribution now always succeeds

Other information & known issues

• Python 3.8 is no longer supported.
• Perceval is compatible with both numpy versions 1 and 2. However, installing a fresh Perceval, then a dependency requiring numpy<2 may result in a pip conflict. If it happens, try to install them both in a single pip command.
• You may have to update pip and setuptools to the latest version before installing Perceval in a Python 3.13 virtual environment.

See syntax changes here: https://perceval.quandela.net/docs/v0.12/legacy.html
You can contact us on the Perceval forum

v0.11.2 - Sir Gawain

Improvements

• Add a Symmetric MZI in the component catalog
• Rectangular GenericInterferometer can now autogenerate any 1-mode component whenever the first or last mode is MZI-free
• Fix typos in logging documentation
• Remove deprecated calls from user documentation

Bug fixes

• Remove a small sleep time in local sampling simulation (that would hinder low photon count sampling)
• Fix how unit tests requiring extra dependencies are run

v0.11.1 - Sir Gawain

New feature

• cQASM circuit to linear optics converter

Improvements

• Logging system user documentation: https://perceval.quandela.net/docs/reference/logging.html
• Fixed typos in the user documentation
• Improved input parameter checks in Photon Recycling
• Optimized noisy state generation in the Source class
• Avoid inconsistent values of shots / samples when creating remote jobs

Bug fixes

Circuit / Processor rendering

• Fixed "floating herald" issue in pdisplay
• Fixed incorrect size of rendered circuit box

Simplify circuit

• Fixed a bug with consecutive permutations in the "simplify circuit" process
• Fixed a bug where a phase shifter with a phi variable parameter could disappear in the "simplify circuit" process

Known issues

• The cQASM converter does not support Python 3.8

v0.11.0 - Sir Gawain

New features

• Local Processor and RemoteProcessor now share the same interface.

  • This means heralding and post-selection is handled on our QPU and Cloud simulators!
  • Introduce a NoiseModel class to setup your noisy simulation consistently between local and remote computations. On top of other noise sources, NoiseModel now supports phase shifter imprecision.
  • All Cloud platforms need to be updated to support these new features. sim:altair and qpu:altair are already up-to-date!

• Photon recycling was implemented as Quandela's first open source noise mitigation algorithm
  See user doc: Error Mitigation in Boson Sampling by Photon recycling
  Article reference: Mitigating photon loss in linear optical quantum circuits: classical postprocessing methods outperforming postselection

• Density Matrix in the Fock Space.
  See: Density matrices in Fock space

• A new usage example is available: Boson bunching
  See: https://perceval.quandela.net/docs/notebooks/Boson_Bunching.html

• Perceval's first approximate strong simulation back-end (based on Gurvits' permanent estimate)
  See: https://perceval.quandela.net/docs/v0.11/backends.html#naiveapprox

• Logging system

• Maximum Likelihood Estimation (MLE) tomography was implemented

• N-Controlled rotation gates added to the component catalog

• StateGenerator may now produce Dicke states

Improvements

• Python 3.12 support
• Optimized noisy algorithms for both strong simulation and sampling back-ends
• The user documentation is now available for multiple Perceval versions
• Improved documentation:
  • pdisplay: https://perceval.quandela.net/docs/reference/pdisplay.html
  • Component catalog: https://perceval.quandela.net/docs/reference/catalog.html
• Optimized ProcessTomography computation time
• Tomography algorithms are now available for remote computing
• MPSBackend now supports large permutations among the circuit components
• Gate based circuit converters now use a better implementation of the heralded CNOT
• Scaleway provider connection code was updated
• PostSelect now supports >= and <= operators

Bug fixes

• Fixed a bug where a Processor containing an input state couldn't be copied
• Fixed an issue where parameter names were lost (replaced by numerical values only) in some computations
• A cancelled job will now try to retrieve partial results
• Fixed a bug in physical performance computation in the noisy algorithm
• Fixed an issue where post-selection wouldn't be processed correctly when composing two processors
• Fixed a bug where post-selection function wouldn't be refreshed in a local Processor that was already used in a simulation

Known issues

• The MyQLMConverter cannot be used on Python 3.12 as myqlm does not support this Python version.

Other information

• See syntax changes here: https://perceval.quandela.net/docs/v0.11/legacy.html
• You can contact us on the Perceval forum

v0.10.5 - Avalon Island

Improvement

• Herald ports display improved
  UnitaryHACK 2024 contribution, by @burlemarxiste

Bug fixes

• Fixed an incompatibility with matplotlib 3.9
• Perceval is not compatible with numpy 2 (yet), so it now specifically requires numpy<2

v0.10.4 - Avalon Island

Improvements

• Update Scaleway provider connection code.

Bug fixes

• Fix Tomography failing on a 3+ qubit gate.
• Fix local use of a Sampler with iterations not returning iteration data in the result list.
• Fix probability distribution to sample count conversion for a low number of samples.

v0.10.3 - Avalon Island

Improvements

• Optimized serialization speed of a large list of samples.
• Improved LaTex rendering in Jupyter notebooks.
• Add method Sampler.clear_iterations() to set new iteration parameters on an existing Sampler object.

Bug fixes

• exqalibur may now be used on any virtual machine making Perceval usable on a wider range of environments.
• Fix invalid syntax in two Simulator methods.
• Fix multiple calls to method get_results() of an asynchronous local job.
• Small fixes in several examples from the user documentation.

v0.10.2 - Avalon Island

Improvement

• Optimize samples (stream) to sample count conversion