Bath Module

OhmicBath

Ohmic bath object to hold a particular parameter set.

Fields

• η – strength.
• ωc – cutoff frequence.
• β – inverse temperature.

Ohmic(η, fc, T)

Construct OhmicBath from parameters with physical unit: η–unitless interaction strength; fc–cutoff frequency in GHz; T–temperature in mK.

struct HybridOhmicBath <: OpenQuantumBase.AbstractBath

A hybrid noise model with both low and high frequency noise. The high frequency noise is characterized by Ohmic bath and the low frequence noise is characterized by the MRT width W.

• W: MRT width (2π GHz)

• ϵl: low spectrum reorganization energy (2π GHz)

• η: strength of high frequency Ohmic bath

• ωc: cutoff frequency

• β: inverse temperature

HybridOhmic(W, η, fc, T)

Construct HybridOhmicBath object with parameters in physical units. W: MRT width (mK); η: interaction strength (unitless); fc: Ohmic cutoff frequency (GHz); T: temperature (mK).

struct EnsembleFluctuator{T} <: OpenQuantumBase.StochasticBath

An ensemble of random telegraph noise.

• f: A list of RTNs

mutable struct CustomBath{lambshift} <: OpenQuantumBase.AbstractBath

An custum bath object defined by the two-point correlation function and the corresponding spectrum.

• cfun: correlation function

• γ: spectrum

• lamb: lambshift S function

mutable struct CorrelatedBath <: OpenQuantumBase.AbstractBath

CorrelatedBath defines a correlated bath type by the matrices of its two-point correlation functions and corresponding spectrums.

• cfun: correlation function

• γ: spectrum

• inds: bath correlator idx

correlation(τ, bath)

Calculate the two point correlation function $C(τ)$ of bath.

γ(ω, bath)

Calculate spectral density $γ(ω)$ of bath.

spectrum(ω, bath)

Calculate spectral density $γ(ω)$ of bath.

S(w, bath; kwargs...)

Calculate the Lamb shift of bath. All the keyword arguments of quadgk function is supported.