  We theoretically show that spontaneously interlayer-coherent bilayer quantum
Hall droplets should allow robust and fault-tolerant pseudospin quantum
computation in semiconductor nanostructures with voltage-tuned external gates
providing qubit control and a quantum Ising Hamiltonian providing qubit
entanglement. Using a spin-boson model we estimate decoherence to be small
$(\sim 10^{-5})$.
