def update_qmi(self, prefix, problem):
num1 = qasm.symbol_to_number(prefix + self.sym1)
num2 = qasm.symbol_to_number(prefix + self.sym2)
if num1 == num2:
self.error_in_line("A chain cannot connect a spin to itself")
elif num1 > num2:
num1, num2 = num2, num1
problem.chains[(num1, num2)] = None # Value is a don't-care.
def update_qmi(self, prefix, problem):
num1 = qasm.symbol_to_number(prefix + self.sym1)
num2 = qasm.symbol_to_number(prefix + self.sym2)
if num1 == num2:
self.error_in_line("A coupler cannot connect a spin to itself")
elif num1 > num2:
num1, num2 = num2, num1
problem.strengths[(num1, num2)] += self.strength
def pin_qubits(self, pin_str):
"Use a helper qubit to help pin values to true or false."
for q_user, b in self.pinned:
q_helper = qasm.symbol_to_number(new_internal_sym())
q1, q2 = q_helper, q_user
if q1 > q2:
q1, q2 = q2, q1
if b:
self.weights[q_helper] += pin_str/2.0
self.weights[q_user] += pin_str
self.strengths[(q1, q2)] += -pin_str/2.0
else:
self.weights[q_helper] += pin_str/2.0
self.weights[q_user] += -pin_str
self.strengths[(q1, q2)] += pin_str/2.0
def update_qmi(self, prefix, problem):
num = qasm.symbol_to_number(prefix + self.sym)
problem.weights[num] += self.weight
def update_qmi(self, prefix, problem):
num = qasm.symbol_to_number(prefix + self.sym)
problem.pinned.append((num, self.goal))