@iota-big3/sdk-quantum
Version:
Quantum-ready architecture with post-quantum cryptography
283 lines • 10 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.QuantumSimulator = void 0;
crypto;
from;
'crypto';
Complex,
QuantumSimulator,
Measurement,
NoiseModel,
QuantumCircuit,
QuantumGate,
QuantumState;
from;
'../types/quantum.types';
class QuantumSimulator {
constructor(config) {
this.isEnabled = true;
this.qubits = config.qubits;
this.gates = config.gates || [];
this.noise = config.noise;
this.backend = config.backend;
this.state = this.initializeState(this.qubits);
this.classicalBits = new Array(this.qubits).fill(false);
}
createCircuit(qubits, classicalBits) {
return {
qubits,
classicalBits: classicalBits || qubits,
gates: [],
measurements: []
};
}
addGate(circuit, gate) {
const maxQubit = Math.max(...gate.qubits);
if (maxQubit >= circuit.qubits) {
throw new Error(`Gate operates on qubit ${maxQubit} but circuit only has ${circuit.qubits} qubits`);
}
circuit.gates.push(gate);
}
addMeasurement(circuit, qubit, classicalBit, basis) {
if (qubit >= circuit.qubits) {
throw new Error(`Invalid qubit index: ${qubit}`);
}
if (classicalBit >= circuit.classicalBits) {
throw new Error(`Invalid classical bit index: ${classicalBit}`);
}
circuit.measurements.push({
qubit,
classicalBit,
basis
});
}
async execute(circuit, shots = 1024) {
const results = [];
for (let shot = 0; shot < shots; shot++) {
this.state = this.initializeState(circuit.qubits);
this.classicalBits = new Array(circuit.classicalBits).fill(false);
for (const gate of circuit.gates) {
await this.applyGate(gate);
}
for (const measurement of circuit.measurements) {
const result = this.measure(measurement);
this.classicalBits[measurement.classicalBit] = result;
}
const bitString = this.classicalBits
.map(bit => bit ? '1' : '0')
.reverse()
.join('');
results.push(bitString);
}
const counts = {};
for (const result of results) {
counts[result] = (counts[result] || 0) + 1;
}
const quantumState = this.getQuantumState();
return {
counts,
state: quantumState,
memory: results
};
}
async applyGate(gate) {
switch (gate.type) {
case 'X':
this.applyPauliX(gate.qubits[0]);
break;
case 'Y':
this.applyPauliY(gate.qubits[0]);
break;
case 'Z':
this.applyPauliZ(gate.qubits[0]);
break;
case 'H':
this.applyHadamard(gate.qubits[0]);
break;
case 'CNOT':
this.applyCNOT(gate.qubits[0], gate.qubits[1]);
break;
case 'Toffoli':
this.applyToffoli(gate.qubits[0], gate.qubits[1], gate.qubits[2]);
break;
case 'custom':
throw new Error('Custom gates not yet implemented');
}
if (this.noise && this.isEnabled) {
await this.applyNoise(gate);
}
}
applyPauliX(qubit) {
const mask = 1 << qubit;
const newState = new Array(this.state.length);
for (let i = 0; i < this.state.length; i++) {
const flipped = i ^ mask;
newState[flipped] = this.state[i];
}
this.state = newState;
}
applyPauliY(qubit) {
const mask = 1 << qubit;
const newState = new Array(this.state.length);
for (let i = 0; i < this.state.length; i++) {
const flipped = i ^ mask;
const factor = ((i & mask) === 0) ?
{ real: 0, imaginary: 1 } :
{ real: 0, imaginary: -1 };
newState[flipped] = this.multiplyComplex(this.state[i], factor);
}
this.state = newState;
}
applyPauliZ(qubit) {
const mask = 1 << qubit;
for (let i = 0; i < this.state.length; i++) {
if ((i & mask) !== 0) {
this.state[i] = this.multiplyComplex(this.state[i], { real: -1, imaginary: 0 });
}
}
}
applyHadamard(qubit) {
const mask = 1 << qubit;
const newState = new Array(this.state.length).fill({ real: 0, imaginary: 0 });
const factor = 1 / Math.sqrt(2);
for (let i = 0; i < this.state.length; i++) {
const bit0 = i & ~mask;
const bit1 = i | mask;
if ((i & mask) === 0) {
newState[bit0] = this.addComplex(newState[bit0], this.multiplyComplex(this.state[i], { real: factor, imaginary: 0 }));
newState[bit1] = this.addComplex(newState[bit1], this.multiplyComplex(this.state[i], { real: factor, imaginary: 0 }));
}
else {
newState[bit0] = this.addComplex(newState[bit0], this.multiplyComplex(this.state[i], { real: factor, imaginary: 0 }));
newState[bit1] = this.addComplex(newState[bit1], this.multiplyComplex(this.state[i], { real: -factor, imaginary: 0 }));
}
}
this.state = newState;
}
applyCNOT(control, target) {
const controlMask = 1 << control;
const targetMask = 1 << target;
const newState = [...this.state];
for (let i = 0; i < this.state.length; i++) {
if ((i & controlMask) !== 0) {
const flipped = i ^ targetMask;
newState[i] = this.state[flipped];
newState[flipped] = this.state[i];
}
}
this.state = newState;
}
applyToffoli(control1, control2, target) {
const mask1 = 1 << control1;
const mask2 = 1 << control2;
const targetMask = 1 << target;
const newState = [...this.state];
for (let i = 0; i < this.state.length; i++) {
if ((i & mask1) !== 0 && (i & mask2) !== 0) {
const flipped = i ^ targetMask;
newState[i] = this.state[flipped];
newState[flipped] = this.state[i];
}
}
this.state = newState;
}
measure(measurement) {
const qubit = measurement.qubit;
const mask = 1 << qubit;
let prob0 = 0;
for (let i = 0; i < this.state.length; i++) {
const amplitude = this.state[i];
const probability = this.magnitude(amplitude) ** 2;
if ((i & mask) === 0) {
prob0 += probability;
}
}
const random = crypto.randomInt(0, Number.MAX_SAFE_INTEGER) / Number.MAX_SAFE_INTEGER;
const measured = random < prob0 ? false : true;
this.collapseState(qubit, measured);
return measured;
}
collapseState(qubit, value) {
const mask = 1 << qubit;
const newState = new Array(this.state.length).fill({ real: 0, imaginary: 0 });
let norm = 0;
for (let i = 0; i < this.state.length; i++) {
const bitValue = (i & mask) !== 0;
if (bitValue === value) {
newState[i] = this.state[i];
norm += this.magnitude(this.state[i]) ** 2;
}
}
const normFactor = 1 / Math.sqrt(norm);
for (let i = 0; i < newState.length; i++) {
newState[i] = this.multiplyComplex(newState[i], { real: normFactor, imaginary: 0 });
}
this.state = newState;
}
getQuantumState() {
const probabilities = this.state.map(amp => this.magnitude(amp) ** 2);
const entanglement = this.calculateEntanglement();
return {
amplitudes: this.state,
probabilities,
entanglement
};
}
calculateEntanglement() {
let maxProb = 0;
for (const amp of this.state) {
const prob = this.magnitude(amp) ** 2;
maxProb = Math.max(maxProb, prob);
}
if (maxProb > 0.99)
return 0;
return 1 - maxProb;
}
async applyNoise(gate) {
if (!this.noise)
return;
const errorRate = this.noise.gateErrors[gate.type] || this.noise.errorRate;
if (crypto.randomInt(0, Number.MAX_SAFE_INTEGER) / Number.MAX_SAFE_INTEGER < errorRate) {
const errorType = Math.floor(crypto.randomInt(0, Number.MAX_SAFE_INTEGER) / Number.MAX_SAFE_INTEGER * 3);
const qubit = gate.qubits[0];
switch (errorType) {
case 0:
this.applyPauliX(qubit);
break;
case 1:
this.applyPauliY(qubit);
break;
case 2:
this.applyPauliZ(qubit);
break;
}
}
}
initializeState(n) {
const size = Math.pow(2, n);
const state = new Array(size);
for (let i = 0; i < size; i++) {
state[i] = i === 0 ?
{ real: 1, imaginary: 0 } :
{ real: 0, imaginary: 0 };
}
return state;
}
addComplex(a, b) {
return {
real: a.real + b.real,
imaginary: a.imaginary + b.imaginary
};
}
multiplyComplex(a, b) {
return {
real: a.real * b.real - a.imaginary * b.imaginary,
imaginary: a.real * b.imaginary + a.imaginary * b.real
};
}
magnitude(c) {
return Math.sqrt(c.real * c.real + c.imaginary * c.imaginary);
}
}
exports.QuantumSimulator = QuantumSimulator;
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