Spin swap vs. double occupancy in quantum gates

Abstract

We propose an approach to realize quantum gates with electron spins localized in a semiconductor that uses double occupancy to advantage. With a fast (non-adiabatic) time control of the tunnelling, the probability of double occupancy is first increased and then brought back exactly to zero. The quantum phase built in this process can be exploited to realize fast quantum operations. We illustrate the idea focusing on the half-swap operation, which is the key two-qubit operation needed to build a CNOT gate.

5 pages, 2 figures

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Cited by in corpus (5)

• The Spin Density Matrix II: Application to a system of two quantum dots
• Entanglement and errors in the control of spins by optical coupling
• The Spin Density Matrix I: General Theory and Exact Master Equations
• Protected quantum gates using qubit doublons in dynamical optical lattices
• On Fermion Entanglement