v.1.9

[1.9.0] - 2026-04-06

Added

• Snapshot persistence: PositronicVariable<T>.ExportSnapshot(), SaveSnapshot(...), LoadSnapshot(...), and FromSnapshot(...) for JSON-based timeline export and restore.
• Durable audit trail: new FileLedgerSink writes append-only JSON Lines ledger entries to disk while preserving the in-memory reverse replay ledger.
• Documentation: added docs/Persistence.md and README guidance for snapshot and ledger workflows.
• Package metadata and documentation version are aligned with PositronicVariables 1.9.0 for the shared release train.

QuantumSuperposition v1.8, PositronicVariables v1.5.1

QuantumSuperposition [1.8.0]

This release introduces comprehensive noise modelling, error mitigation, and a dedicated simulation framework for realistic quantum environments.

Added

Advanced Noise Modelling: Introduced NoiseModel supporting realistic quantum hardware errors, including ThermalRelaxation.

Noisy Quantum Systems: Added NoisyQuantumSystem and QuantumSystem abstractions for testing algorithms under decoherence and simulated hardware constraints.

Error Mitigation Suite: Implemented ReadoutMitigator, TensoredReadoutMitigator, PECSampler (Probabilistic Error Cancellation), and ZeroNoiseExtrapolation to recover fidelity from noisy results.

Gate Queue Optimisation: Added new optimisations and benchmarking (GateQueueOptimizationBenchmarks) to streamline circuit execution.

Expanded Algorithms & Testing: Introduced ReadoutMitigatorTests, PECSamplerTests, and ZeroNoiseExtrapolationTests to the QuantumSoupTester.

PositronicVariables [1.5.1]

This update massively expands the temporal and transactional capabilities of the Positronic convergence engine, enabling more robust timeline manipulation and cross-variable telemetry.

Added

The Unhappening Engine: Added UnhappeningEngine.cs for advanced timeline rewinding and consequence-reversal scenarios.

Bureau of Temporal Records: Introduced a dedicated archivist (BureauOfTemporalRecords) for tracking and auditing immutable timeline snapshots.

Sub-Etha Transponder System: Added ISubEthaTransponder, SubEthaOutputTransponder, and the AethericRedirectionGrid for managing side-effects and out-of-band communication during convergence loops.

Next-Gen Transactions: Upgraded the transaction model with TransactionV2 and TransactionV3, and introduced STMTelemetry for deep insights into transactional variable contention and performance.

NeuroCascade Initialiser: Added NeuroCascadeInitialiser.cs to handle complex probabilistic circuit and neural nodule bootstrapping.

Hotspot Aggregation: Implemented Hotspot and HotspotAggregator to monitor and manage highly contested positronic variables.

Changed

Concurrency Handling: Enhanced transaction stability with ConcurrencyGuard and robust ParanoiaConfig (ParanoiaModeTests).

Logging & Telemetry: Upgraded the Ledger to use BufferedLedgerEntry and RegretScribe for cleaner historical regret tracking.

### QuantumSuperposition v1.7.4, ### PositronicVariables v1.4

Quantum Superpositions

[1.7.4] - 2025-11-19

Added

• Initial changelog (this file) establishing version history tracking.
• QuantumRegister abstraction for coherent grouped qubit index handling (partial collapse, integer decoding, amplitude initialisation).
• PhysicsQubit specialised computational basis qubit with Bloch sphere constructors and Zero / One shortcuts.
• Canonical state factories: EPRPair, WState, GHZState via QuantumRegister helpers.
• Gate * register operator sugar: apply single / multi qubit gates directly with gate * register syntax.
• Extended gate catalogue: identity tensor factories, multi length Hadamard, Pauli Y/Z, SWAP, √SWAP, Toffoli (CCNOT), Fredkin (CSWAP), generic Controlled(inner), monolithic Quantum Fourier Transform unitary factory.
• Quantum algorithms API: high level QuantumAlgorithms.QuantumFourierTransform and QuantumAlgorithms.GroverSearch with internal gate scheduling.
• Weighted superposition support with complex amplitudes across QuBit<T> and Eigenstates<T> plus deterministic seeded sampling and mock collapse injection.
• Functional and LINQ style non collapse operators: Select, Where, SelectMany, p_op, p_func preserving superpositions.
• Non observational arithmetic flag (QuantumConfig.EnableNonObservationalArithmetic) enabling scalar and pairwise arithmetic without forced collapse; includes commutative optimisation cache.
• Tolerant equality: QuantumRegister.AlmostEquals, Eigenstates<T>.AlmostEquals probability mass based comparisons.
• Entanglement graph diagnostics and versioning utilities; tagging, partial collapse staging, locking / freezing and multi party collapse agreement.

Changed

• README completely restructured for clarity: capability sections, documentation map, British English spelling, concise feature matrix.
• Documentation split into focused markdown files (FunctionalOps, Entanglement, ComplexSupport, QuantumAlgorithms, PhysicsQubit, QuantumRegister, GateRegisterSugar, GateCatalogue, CanonicalStates, Equality, UsageExamples).
• Gate scheduling visualisation wording updated to British English ("visualise").
• Consistent terminology: "normalise", "initialisation", "behaviour", "optimisation" across code comments and docs.

Fixed

• Numerous wording inconsistencies in documentation (American to British English spellings).
• Minor formatting issues in previous README (duplicate headings, em dash usage removed).

Removed

• Legacy monolithic README narrative sections superseded by modular docs.

Performance

• Commutative optimisation avoids duplicate evaluation of pure operations (e.g. caching results for a + b vs b + a).
• Select / Where chains retain lazy non collapse semantics reducing unnecessary sampling.

Documentation

• Added usage examples for prime detection, factors, minimum value extraction and multi qubit gate application.
• Expanded algorithm breakdown (QFT gate sequence, Grover diffusion operator internals).

Positronic Variables

[1.4.0] - 2024-10-01

Added

• Integration tests for enhanced reliability.
• Support for string manipulation and generic types.
• Dependency Injection support allowing scoped and testable runtime environments.
• Convergence engine builder with middleware chaining for flexible convergence logic.
• Epoch tagging for better timeline synchronisation in convergence loops.
• Running domain tracking to remember all values ever seen by variables.
• New operations: ReversibleModulusOp for modulus operations with undo support.
• Enhanced neural nodule functionality for building probabilistic circuits.
• Bitwise operators support (AND, OR, XOR, NOT, shifts) for integral types.
• Improved arithmetic operations with commutative caching and non observational modes.

Changed

• Major refactor of PositronicVariable system for clarity and robustness.
• Updated design pattern to use GetOrCreate for variable instantiation.
• Enhanced timeline handling including better reset logic for outside writes.
• Refactored reverse replay and scalar close handling for improved convergence.
• Improved loop handling and domain reset logic.
• Updated tests and logging throughout the framework.
• Merged PositronicVariableRef and PositronicVariable into a single class.
• Enhanced README with better examples and documentation.
• Updated versions and dependencies across projects.

Fixed

• Handling of closing replace operations and detection of "x = x + k" patterns.
• Timeline reset issues in ResetTimelineIfOutsideWrites.
• Convergence behaviour in various edge cases including scalar convergence.
• Console formatting and output issues in tests.
• QuantumLedgerOfRegret clearing before loop execution.
• Various bugs in reverse replay and forward handling.
• HTML entities in README.md.
• Error messages for non IComparable types.

Removed

• Antival console formatting and related obsolete tests.

Technical Improvements

• Better synchronisation and middleware support in convergence engine.
• Improved probabilistic and functional operator tests.
• Enhanced quantum gate and algorithm tests.
• Refactored comments and code structure for maintainability.
• Added support for complex numbers and advanced quantum operations.

### QuantumSuperposition v1.7.3, ### PositronicVariables v1.3.4

PositronicVariable test suite now complete, functionality complete and paired with QuantumSuperposition.

Added bitwise operators and tests, generally a happy little universe, this is the first release that's generally self consistant.

Entanglement Mechanics

The weird just got weirder. QuBits can now share destiny in style:

• Entangled Variable Linking: Tie variables together like they're in a codependent relationship.
• Collapse Propagation: Observing one causes collapse across the entire group — because misery loves company.
• Tensor Product Expansion: Generate all state combos across multiple QuBits, like a quantum group project.
• Entangled Group Mutation Propagation: Mutate one, mutate them all. Drama ensues.
• Entanglement Group Versioning: Track generational history of entangled graphs, because even quantum relationships have baggage.
• Entanglement Guardrails: Blocks self-links, paradoxes, and other crimes against nature.
• Multi-Party Collapse Agreement: Observers agree on a shared reality. For once.
• Entanglement Locking / Freezing: Prevent changes during critical operations — useful when the multiverse needs a time-out.
• Entanglement Group Tagging / Naming: Name your entanglement groups like pets. Examples: BellPair_A, QuantumDrama42.
• Partial Collapse Staging: Observe one qubit now, another later. Suspense!
• Entanglement Graph Diagnostics: Inspect group sizes, circular references, and the chaos % — an actual metric we now regret naming.

### QuantumSuperposition v1.2.0, ### PositronicVariables v1.0.0

QuantumSuperposition v1.2.0

• Added support for Hadamard basis sampling
• Improved Collapse() determinism via replay-safe seed tracking

https://www.nuget.org/packages/QuantumSuperposition

PositronicVariables v1.0.0

• Refactored PositronicVariable<T> to inherit from QuantumSoup<T>
• Added RunConvergenceLoopUntilStable() to simulate standoffish variables

https://www.nuget.org/packages/PositronicVariables