void SQuIDS::ini(unsigned int n, unsigned int nsu, unsigned int nrh, unsigned int nsc, double ti){
/*
Setting the number of energy bins, number of components for the density matrix and
number of scalar functions
*/
nx=n;
nsun=nsu;
nrhos=nrh;
nscalars=nsc;
size_rho=nsun*nsun;
size_state=(size_rho*nrhos+nscalars);
/*
Setting time units and initial time
*/
t_ini=ti;
t=ti;
//Allocate memory for the system
unsigned int numeqn=nx*size_state;
system.reset(new double[numeqn]);
sys.dimension = static_cast<size_t>(numeqn);
/*
Initializing the SU algebra object, needed to compute algebraic operations like commutators,
anticommutators, rotations and evolutions
*/
//Allocate memory
x.resize(nx);
state.reset(new SU_state[nx]);
estate.reset(new SU_state[nx]);
dstate.reset(new SU_state[nx]);
for(unsigned int ei = 0; ei < nx; ei++){
state[ei].rho.reset(new SU_vector[nrhos]);
estate[ei].rho.reset(new SU_vector[nrhos]);
dstate[ei].rho.reset(new SU_vector[nrhos]);
}
//initially, estate just points to the same memory as state
for(unsigned int ei = 0; ei < nx; ei++){
for(unsigned int i=0;i<nrhos;i++){
state[ei].rho[i]=SU_vector(nsun,&(system[ei*size_state+i*size_rho]));
estate[ei].rho[i]=SU_vector(nsun,&(system[ei*size_state+i*size_rho]));
dstate[ei].rho[i]=SU_vector(nsun,nullptr);
}
if(nscalars>0){
state[ei].scalar=&(system[ei*size_state+nrhos*size_rho]);
estate[ei].scalar=&(system[ei*size_state+nrhos*size_rho]);
}
}
last_dstate_ptr=nullptr;
last_estate_ptr=nullptr;
is_init=true;
};
void rabi::init(double D_E, double wi, double Am){
Delta_E=D_E;
w=wi;
A=Am;
params.SetMixingAngle(0,1,params.pi/4);
ini(1,2,1,0,0);
Set_CoherentInteractions(true);
evol_b0_proj.reset(new SU_vector[nx*nsun]);
evol_b1_proj.reset(new SU_vector[nx*nsun]);
b0_proj.reset(new SU_vector[nsun]);
b1_proj.reset(new SU_vector[nsun]);
for(int i = 0; i < nsun; i++){
b0_proj[i]=SU_vector::Projector(nsun,i);
b1_proj[i]=SU_vector::Projector(nsun,i);
b1_proj[i].RotateToB1(params);
for(int ei = 0; ei < nx; ei++){
evol_b0_proj[i*nx + ei]=SU_vector::Projector(nsun,i);
evol_b1_proj[i*nx + ei]=SU_vector::Projector(nsun,i);
evol_b1_proj[i*nx + ei].RotateToB1(params);
}
}
suH0=SU_vector(nsun);
d=SU_vector(nsun);
d0=SU_vector(nsun);
d0=(b1_proj[0]-b1_proj[1]);
suH0 = b0_proj[1]*Delta_E;
// set initial conditions for the density matrix.
state[0].rho[0] = b0_proj[0];
}