Struct roqoqo::noise_models::ContinuousDecoherenceModel

pub struct ContinuousDecoherenceModel {
    pub lindblad_noise: PlusMinusLindbladNoiseOperator,
}

Noise model representing a continuous decoherence process on qubits.

This noise model assumes that all qubits are constantly experiencing decoherence over time (e.g. due to coupling to the environment). The noise for each qubit can be different but only single qubit noise is included in the model.

Noise is given by the rates of the Lindblad equation. The Lindblad equation is a so-called master equation for the time evolution of a density matrix. For the example of a single qubit the non-coherent part of the Lindblad equation can take the following form:

d/dt * ρ = Σ Mij * Li * ρ * Lj† - 1/2 * ( Lj† * Li * ρ + ρ * Lj† * Li),

where the indices i and j run from 0 to 2

with L0 = σ+, L1 = σ- and L3 = σz.

Here the general incoherent part of the Lindblad equation is internally represented by a struqture::spins::PlusMinusLindbladNoiseOperator.

To create a complex decoherence model first create the Lindblad noise and then turn it into a ContinuousDecoherenceModel. For a simple decoherence model, use new to create an empty model and use the add_damping, add_excitation, add_depolarising and add_dephasing methods. For more fine control access the internal lindblad_noise directly and modify it.

Fields

lindblad_noise: PlusMinusLindbladNoiseOperator

Decoherence rates for all qubits

Implementations

impl ContinuousDecoherenceModel

pub fn new() -> Self

Create a new empty ContinuousDecoherenceModel.

pub fn add_damping_rate(self, qubits: &[usize], rate: f64) -> Self

Convenience function to add damping to several qubits

Arguments

• qubits - The qubits to add damping to.
• rate - The damping rate.

Returns

self - The ContinuousDecoherenceModel with the damping added.

pub fn add_excitation_rate(self, qubits: &[usize], rate: f64) -> Self

Convenience function to add rate of excitation from 0 to 1 state to several qubits

Arguments

• qubits - The qubits to add the rate of excitation to.
• rate - The rate of excitation.

Returns

• self - The ContinuousDecoherenceModel with the rate of excitation added.

pub fn add_dephasing_rate(self, qubits: &[usize], rate: f64) -> Self

Convenience function to add damping to several qubits

Arguments

• qubits - The qubits to add dephasing to.
• rate - The dephasing rate.

Returns

• self - The ContinuousDecoherenceModel with the dephasing added.

pub fn add_depolarising_rate(self, qubits: &[usize], rate: f64) -> Self

Convenience function to add depolarising to several qubits

Arguments

• qubits - The qubits to add depolarising to.
• rate - The rate of depolarising.

Returns

• self - The ContinuousDecoherenceModel with the rate of depolarising added.

Trait Implementations

impl Clone for ContinuousDecoherenceModel

fn clone(&self) -> ContinuousDecoherenceModel

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ContinuousDecoherenceModel

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ContinuousDecoherenceModel

fn default() -> ContinuousDecoherenceModel

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ContinuousDecoherenceModel

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<ContinuousDecoherenceModel> for NoiseModel

fn from(value: ContinuousDecoherenceModel) -> Self

Converts to this type from the input type.

impl From<ContinuousDecoherenceModel> for PlusMinusLindbladNoiseOperator

fn from(value: ContinuousDecoherenceModel) -> Self

Converts to this type from the input type.

impl From<PlusMinusLindbladNoiseOperator> for ContinuousDecoherenceModel

fn from(value: PlusMinusLindbladNoiseOperator) -> Self

Converts to this type from the input type.

impl PartialEq for ContinuousDecoherenceModel

fn eq(&self, other: &ContinuousDecoherenceModel) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ContinuousDecoherenceModel

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl SupportedVersion for ContinuousDecoherenceModel

fn minimum_supported_roqoqo_version(&self) -> (u32, u32, u32)

Returns the minimum roqoqo version that supports the operation.

impl StructuralPartialEq for ContinuousDecoherenceModel