Gate Class Reference

Base class for quantum gate operations. More...

#include <gate.hpp>

Inheritance diagram for Gate:

Public Member Functions
	Gate ()
	Gate (const std::vector< size_t > &nlevels_, const std::vector< size_t > &nessential_, double time_, const std::vector< double > &gate_rot_freq, DecoherenceType decoherence_type_, bool quietmode=false)
	Constructor for quantum gates.
virtual	~Gate ()
PetscInt	getDimRho ()
	Retrieves the dimension of the density matrix.
void	assembleGate ()
	Assembles the vectorized gate matrix.
void	applyGate (const Vec state, Vec VrhoV)
	Applies the gate transformation to a quantum state.

Protected Attributes
Mat	V_re
Mat	V_im
	Real and imaginary parts of V_target, non-vectorized, essential levels only.
std::vector< size_t >	nessential
	Number of essential levels per oscillator.
std::vector< size_t >	nlevels
	Total number of levels per oscillator.
int	mpirank_petsc
	MPI rank in PETSc communicator.
int	mpisize_petsc
	MPI size in PETSc communicator.
int	mpirank_world
	MPI rank in world communicator.
bool	quietmode
	Flag to suppress output messages.
PetscInt	dim_ess
	Dimension of target gate matrix (non-vectorized), essential levels only.
PetscInt	dim_rho
	Dimension of system matrix rho (non-vectorized), all levels, N.
double	final_time
	Final time T. Time of gate rotation.
std::vector< double >	gate_rot_freq
	Frequencies of gate rotation (rad/time). Default: 0.0.
DecoherenceType	decoherence_type
	Type of Lindblad operators for open system dynamics.

Detailed Description

Base class for quantum gate operations.

The Gate class provides the fundamental interface for quantum gate operations in quantum optimal control. It handles the transformation \(V \rho V^\dagger\) where \(V\) is the unitary gate matrix (target unitary transformation).

Constructor & Destructor Documentation

Gate() [1/2]

Gate::Gate

(

)

Gate() [2/2]

Gate::Gate	(	const std::vector< size_t > &	nlevels_,
		const std::vector< size_t > &	nessential_,
		double	time_,
		const std::vector< double > &	gate_rot_freq,
		DecoherenceType	decoherence_type_,
		bool	quietmode = false
	)

Constructor for quantum gates.

Parameters

nlevels_	Number of levels per oscillator.
nessential_	Number of essential levels per oscillator.
time_	Final time for gate rotation.
gate_rot_freq	Frequencies of gate rotation (rad/time).
decoherence_type_	Type of Lindblad operators for open system dynamics.
quietmode	Flag to suppress output messages (default: false).

~Gate()

Gate::~Gate ( )

virtual

Member Function Documentation

applyGate()

void Gate::applyGate	(	const Vec	state,
		Vec	VrhoV
	)

Applies the gate transformation to a quantum state.

Computes \(V\rho V^\dagger\) where \(V\) is the gate matrix and \(\rho\) is the input state. The output vector VrhoV must be pre-allocated.

Parameters

state	Input quantum state vector.
VrhoV	Output vector storing the transformed state.

assembleGate()

void Gate::assembleGate

(

)

Assembles the vectorized gate matrix.

Computes VxV_re = \(\text{Re}(\bar{V} \otimes V)\) and VxV_im = \(\text{Im}(\bar{V} \otimes V)\) where V is the gate matrix.

getDimRho()

PetscInt Gate::getDimRho ( )

inline

Retrieves the dimension of the density matrix.

Returns

PetscInt Dimension of the system density matrix (all levels).

Member Data Documentation

decoherence_type

DecoherenceType Gate::decoherence_type

protected

Type of Lindblad operators for open system dynamics.

dim_ess

PetscInt Gate::dim_ess

protected

Dimension of target gate matrix (non-vectorized), essential levels only.

dim_rho

PetscInt Gate::dim_rho

protected

Dimension of system matrix rho (non-vectorized), all levels, N.

final_time

double Gate::final_time

protected

Final time T. Time of gate rotation.

gate_rot_freq

std::vector<double> Gate::gate_rot_freq

protected

Frequencies of gate rotation (rad/time). Default: 0.0.

mpirank_petsc

int Gate::mpirank_petsc

protected

MPI rank in PETSc communicator.

mpirank_world

int Gate::mpirank_world

protected

MPI rank in world communicator.

mpisize_petsc

int Gate::mpisize_petsc

protected

MPI size in PETSc communicator.

nessential

std::vector<size_t> Gate::nessential

protected

Number of essential levels per oscillator.

nlevels

std::vector<size_t> Gate::nlevels

protected

Total number of levels per oscillator.

quietmode

bool Gate::quietmode

protected

Flag to suppress output messages.

V_im

Mat Gate::V_im

protected

Real and imaginary parts of V_target, non-vectorized, essential levels only.

V_re

Mat Gate::V_re

protected

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The documentation for this class was generated from the following files:

• /home/runner/work/quandary/quandary/include/gate.hpp
• /home/runner/work/quandary/quandary/src/gate.cpp