什么玩意儿？量子傅里叶变换？？？这是啥玩意

#Quantum Fourier Transform
def qft(qlist):
	circ = QCircuit()

	qnum = len(qlist)
	for i in range(0,qnum):
		circ.insert(H(qlist[qnum-1-i]))
		for j in range(i+1,qnum):
			circ.insert(CR(qlist[qnum-1-i],qlist[qnum-1-i],m.pi/(1 <<(j-i))))
	for i in range(0,qnum//2):
		circ.insert(CNOT(qlist[i],qlist[qnum-1-i]))
		circ.insert(CNOT(qlist[qnum-1-i],qlist[i]))
		circ.insert(CNOT(qlist[i],qlist[qnum-1-i]))

	return circ