Abstract
A crucial requirement for quantum-information processing is the realization of multiple-qubit quantum gates. Here, we demonstrate an electron spin-based all-electrical two-qubit gate consisting of single-spin rotations and interdot spin exchange in a double quantum dot. A partially entangled output state is obtained by the application of the two-qubit gate to an initial, uncorrelated state. We find that the degree of entanglement is controllable by the exchange operation time. The approach represents a key step towards the realization of universal multiple-qubit gates.
- Received 18 March 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.146801
© 2011 American Physical Society
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One, Two, Bits of Spin
Published 26 September 2011
Combining operations with one and two spin qubits may lead to superior quantum computers.
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