Module gpu_observables 

GPU-accelerated observable calculations for quantum states

This module provides high-performance observable computation routines that leverage GPU acceleration when available, with automatic fallback to optimized CPU implementations.

Supported Observables

• Pauli Observables: Single and multi-qubit Pauli strings (X, Y, Z)
• Hamiltonian Expectation Values: Efficient evaluation of sums of Pauli operators
• Variance Calculations: Observable variance for uncertainty quantification
• Batched Observables: Compute multiple expectation values in parallel

Example

use quantrs2_sim::gpu_observables::{PauliObservable, ObservableCalculator};

let obs = PauliObservable::from_string("XYZ")?;
let calculator = ObservableCalculator::new();
let expectation = calculator.expectation_value(&state, &obs)?;

Structs

ObservableCalculator

High-performance observable calculator with GPU support

ObservableConfig

Configuration for observable calculations

PauliHamiltonian

Hamiltonian as a sum of Pauli observables

PauliObservable

Multi-qubit Pauli observable (tensor product of single-qubit Paulis)

Enums

PauliOp

Single-qubit Pauli operator