Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling

Details Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling

2006-05-23

arxiv.org/abs/cond-mat/0605576v2

Phys. Rev. Lett. 98, 050502 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures; final version v2 (minor changes)

Scientific paper

10.1103/PhysRevLett.98.050502

We propose a set of universal gate operations for the singlet-triplet qubit realized by two electron spins in a double quantum dot, in the presence of a fixed inhomogeneous magnetic field. All gate operations are achieved by switching the potential offset between the two dots with an electrical bias, and do not require time-dependent control of the tunnel coupling between the dots. We analyze the two-electron dynamics and calculate the effective qubit rotation angle as a function of the applied electric bias. We present explicit gate sequences for single-qubit rotations about two orthogonal axes, and a CNOT gate sequence, completing the universal gate set.

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