Quantum Circuit Simulator

Supports 3 kinds of operations

• apply a logic gate to any subset of qubits
• measure a qubit and write the result into a classical bit
• apply logic gates conditionally based on the value of a classical bit

Main.ts

Examples of bell circuit and teleportation circuit in src/main.ts.

Bell circuit

Input wavefunction - $1 \cdot |00 \rangle$

Output wavefunction - $$\dfrac{|00 \rangle + |11 \rangle}{\sqrt{2}} = 0.7071 \cdot |00\rangle + 0.7071 \cdot |11\rangle$$

Teleportation circuit

3 qubits - p, q, r

Alice holds p and q, Bob holds r. We want to teleport the state of the qubit p to the qubit r.

Input wavefunction - $$\alpha \cdot |000 \rangle + \beta \cdot |000 \rangle = (\alpha \cdot |0 \rangle_p + \beta \cdot |1 \rangle_p) \otimes |0 \rangle_q \otimes |0 \rangle_r$$

One possible output wavefunction - $$\alpha \cdot |100 \rangle + \beta \cdot |101 \rangle = |1 \rangle_p \otimes |0 \rangle_q \otimes (\alpha \cdot |0 \rangle_r + \beta \cdot |1 \rangle_r)$$ In this case, p has collapsed into the state $|1 \rangle$ and q has collapsed into the state $|0 \rangle$ and r has got p's initial wavefunction.

Running main

$ tsc
$ node dist/main.js

Simulating bell circuit...
Wavefunction before the simulation: 1|00>
Wavefunction after simulation: 0.7071|00> + 0.7071|11>

Simulating teleportation circuit...
Wavefunction before the simulation: 0.6325|000> + 0.7746|100>
Wavefunction after simulation: 0.6325|100> + 0.7746|101>

Running tests

$ npx jest