HomeQuantum PhysicsCharge Qubit Coherence in a Double Quantum Dot

Charge Qubit Coherence in a Double Quantum Dot (2D)

Interactive 2D simulator of a double-quantum-dot charge qubit: genuinely time-integrates the two-level Schrodinger equation (RK4) with an ensemble of random-telegraph charge fluctuators driving real T2* dephasing, live-plotting the decaying Rabi-oscillation envelope.

Quantum Physics2DAdvanced60 FPS📱 Mobile-adapted⇄ 3D version
2d-quantum-dot-charge-qubit-coherence ↗ Open standalone

This 2D companion strips the double-dot charge qubit down to the actual quantum mechanics: rather than plotting a closed-form sin² formula, it numerically time-integrates the two-level time-dependent Schrodinger equation with 4th-order Runge–Kutta, propagating a genuine complex probability amplitude between the left and right dot at every animation frame. A dozen parallel trajectories, each driven by its own ensemble of sixteen random-telegraph charge fluctuators feeding real detuning noise straight into the Hamiltonian, are averaged live to show the same physics the 3D scene renders — coherent Rabi oscillation between the dots, decaying at a rate set by charge noise and vanishing at the ε = 0 sweet spot — but as a directly computed trace rather than an animated 3D landscape.

⚙ Under the hood

Watch an electron coherently oscillate between two tunnel-coupled quantum dots at frequency Ω = √(ε²+4t_c²), then tune detuning, tunnel coupling and charge noise to find the 'sweet spot' where dephasing from fluctuating gate voltages is suppressed.

charge qubitquantum dotdecoherencesweet spottunnel couplingquantum computing

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install

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