Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling |
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Authors: | Hanson Ronald Burkard Guido |
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Affiliation: | Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA. |
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Abstract: | 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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