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Spin Qubit Exchange Coupling

Interactive double-quantum-dot simulator: tune detuning and tunnel coupling to control the Heisenberg exchange splitting J between two electron spins, and watch the singlet-triplet qubit precess on a Bloch sphere.

Quantum Physics3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

Two electron spins trapped in neighbouring gate-defined quantum dots form a "singlet-triplet" qubit whose splitting is set purely electrically, by the Heisenberg exchange interaction J between the spins. This simulator diagonalizes the real two-level charge Hamiltonian of a double quantum dot to compute J(ε) as a function of interdot detuning and tunnel coupling, then evolves the resulting singlet-triplet Bloch vector under J together with an external field gradient ΔB_z, reproducing the exchange-oscillation and two-axis control scheme used in real singlet-triplet spin-qubit devices.

⚙ Under the hood

Tune the interdot detuning and tunnel coupling of a double quantum dot to control the Heisenberg exchange splitting J between two electron spins, then watch the singlet-triplet qubit precess on a Bloch sphere under exchange and an external field gradient.

quantum dotsspin qubitexchange interactionBloch spherequantum computing

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install