DWQMI

class DWQMI : public xacc::Instruction

The DWQMI (D=Wave Quantum Machine Instruction) class is an XACC Instruction that models a logical problem or hardware bias or connection for an optimization problem to be solved on the D-Wave QPU. It keeps track of 2 bits indices, if both are the same index then this DWQMI Instruction models a bias value, and if they are different indices, then this Instruction models a logical coupling.

Note that this class can model both problem bias/couplings and hardware bias/couplings. The hardware bias/couplings result from a minor graph embedding computation.

Public Functions

DWQMI(int qbit)

The Constructor, takes one qubit indicating this is a bias value, initialized to 0.0

Parameters

  • qbit: The bit index

DWQMI(int qbit, double param)

The Constructor, takes one qubit indicating this is a bias value, but set to the provided bias.

Parameters

  • qbit: The bit index

  • param: The bias value

DWQMI(int qbit1, int qbit2, double param)

The Constructor, takes two qubit indices to indicate that this is a coupler, with value given by the provided parameter.

Parameters

  • qbit1: The bit index

  • qbit2: The bit index

  • param: The coupling weight

const std::string name() const

Return the name of this Instruction

Return

name The name of this Instruction

const std::string description() const

Return the description of this instance

Return

description The description of this object.

void mapBits(std::vector<int> bitMap)

Map bits [0,1,2,…] to [bitMap[0],bitMap[1],…]

Parameters

  • bitMap: The bits to map to

const std::string toString(const std::string &bufferVarName)

Persist this Instruction to an assembly-like string.

Return

str The assembly-like string.

Parameters

const std::string toString()

Persist this Instruction to an assembly-like string.

Return

str The assembly-like string.

const std::vector<int> bits()

Return the indices of the bits that this Instruction operates on.

Return

bits The bits this Instruction operates on.

InstructionParameter getParameter(const int idx) const

Return this Instruction’s parameter at the given index.

Return

param The InstructionParameter at the given index.

Parameters

  • idx: The index of the parameter.

std::vector<InstructionParameter> getParameters()

Return all of this Instruction’s parameters.

Return

params This instructions parameters.

void setParameter(const int idx, InstructionParameter &inst)

Set this Instruction’s parameter at the given index.

Parameters

  • idx: The index of the parameter

  • inst: The instruction.

const int nParameters()

Return the number of InstructionParameters this Instruction contains.

Return

nInsts The number of instructions.

bool isParameterized()

Return true if this Instruction is parameterized.

Return

parameterized True if this Instruction has parameters.

bool isComposite()

Returns true if this Instruction is composite, ie, contains other Instructions.

Return

isComposite True if this is a composite Instruction

bool isEnabled()

Returns true if this Instruction is enabled

Return

enabled True if this Instruction is enabled.

void disable()

Disable this Instruction

void enable()

Enable this Instruction.

bool hasOptions()

Return true if this Instruction has customizable options.

Return

hasOptions

void setOption(const std::string optName, InstructionParameter option)

Set the value of an option with the given name.

Parameters

  • optName: The name of the option.

  • option: The value of the option

InstructionParameter getOption(const std::string optName)

Get the value of an option with the given name.

Return

option The value of the option.

Parameters

  • optName: Then name of the option.

std::map<std::string, InstructionParameter> getOptions()

Return all the Instructions options as a map.

Return

optMap The options map.