PauliStr

Functions for applying a tensor product of Pauli operators, as a PauliStr. More...

Functions
void	applyControlledPauliStr (Qureg qureg, int control, PauliStr str)
void	applyMultiControlledPauliStr (Qureg qureg, int *controls, int numControls, PauliStr str)
void	applyMultiStateControlledPauliStr (Qureg qureg, int *controls, int *states, int numControls, PauliStr str)
void	applyPauliStr (Qureg qureg, PauliStr str)

Detailed Description

Functions for applying a tensor product of Pauli operators, as a PauliStr.

Function Documentation

applyControlledPauliStr()

void applyControlledPauliStr	(	Qureg	qureg,
		int	control,
		PauliStr	str )

Note

Documentation for this function or struct is under construction!

Definition at line 947 of file operations.cpp.

                                                                     {
    validate_quregFields(qureg, __func__);
    validate_controlAndPauliStrTargets(qureg, control, str, __func__);
 
    // harmlessly re-validates
    applyMultiStateControlledPauliStr(qureg, &control, nullptr, 1, str);
}

applyMultiControlledPauliStr()

void applyMultiControlledPauliStr	(	Qureg	qureg,
		int *	controls,
		int	numControls,
		PauliStr	str )

Note

Documentation for this function or struct is under construction!

Definition at line 955 of file operations.cpp.

                                                                                             {
    validate_quregFields(qureg, __func__);
    validate_controlsAndPauliStrTargets(qureg, controls, numControls, str, __func__);
 
    // harmlessly re-validates
    applyMultiStateControlledPauliStr(qureg, controls, nullptr, numControls, str);
}

Referenced by applyMultiControlledPauliStr().

applyMultiStateControlledPauliStr()

void applyMultiStateControlledPauliStr	(	Qureg	qureg,
		int *	controls,
		int *	states,
		int	numControls,
		PauliStr	str )

Note

Documentation for this function or struct is under construction!

See also

applyMultiStateControlledCompMatr1()

Definition at line 963 of file operations.cpp.

                                                                                                               {
    validate_quregFields(qureg, __func__);
    validate_controlsAndPauliStrTargets(qureg, controls, numControls, str, __func__);
    validate_controlStates(states, numControls, __func__); // permits states==nullptr
 
    qcomp factor = 1;
    auto ctrlVec = util_getVector(controls, numControls);
    auto stateVec = util_getVector(states, numControls); // empty if states==nullptr
 
    // when there are no control qubits, we can merge the density matrix's 
    // operation sinto a single tensor, i.e. +- (shift(str) (x) str), to 
    // avoid superfluous re-enumeration of the state
    if (qureg.isDensityMatrix && numControls == 0) {
        factor = paulis_getSignOfPauliStrConj(str);
        ctrlVec = util_getConcatenated(ctrlVec, util_getBraQubits(ctrlVec, qureg));
        stateVec = util_getConcatenated(stateVec, stateVec); 
        str = paulis_getKetAndBraPauliStr(str, qureg);
    }
 
    localiser_statevec_anyCtrlPauliTensor(qureg, ctrlVec, stateVec, str, factor);
 
    // but density-matrix control qubits require two distinct operations
    if (qureg.isDensityMatrix && numControls > 0) {
        factor = paulis_getSignOfPauliStrConj(str);
        ctrlVec = util_getBraQubits(ctrlVec, qureg);
        str = paulis_getShiftedPauliStr(str, qureg.numQubits);
        localiser_statevec_anyCtrlPauliTensor(qureg, ctrlVec, stateVec, str, factor);
    }
}

Referenced by applyControlledPauliStr(), applyMultiControlledPauliStr(), applyMultiStateControlledMultiQubitNot(), applyMultiStateControlledPauliStr(), and applyPauliStr().

applyPauliStr()

void applyPauliStr	(	Qureg	qureg,
		PauliStr	str )

Note

Documentation for this function or struct is under construction!

Definition at line 939 of file operations.cpp.

                                              {
    validate_quregFields(qureg, __func__);
    validate_pauliStrTargets(qureg, str, __func__);
 
    // harmlessly re-validates
    applyMultiStateControlledPauliStr(qureg, nullptr, nullptr, 0, str);
}