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We propose a set of universal gate operations for the singlet-triplet qubitrealized by two electron spins in a double quantum dot, in the presence of afixed inhomogeneous magnetic field. All gate operations are achieved byswitching the potential offset between the two dots with an electrical bias,and do not require time-dependent control of the tunnel coupling between thedots. We analyze the two-electron dynamics and calculate the effective qubitrotation angle as a function of the applied electric bias. We present explicitgate sequences for single-qubit rotations about two orthogonal axes, and a CNOTgate sequence, completing the universal gate set.Comment: 5 pages, 4 figures; final version v2 (minor changes

Universal Set of Quantum Gates for Double-Dot Spin Qubits with Fixed Interdot Coupling