Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots

Abstract

We describe an interaction mechanism between electron spins in a vertically-stacked double quantum dot that can be used for controlled two-qubit operations. This interaction is mediated by excitons confined within, and delocalized over, the double dot. We show that gates equivalent to the SQRT-SWAP gate can be obtained in times much less than the exciton relaxation time and that the negative effects of hole-mixing and spontaneous emission do not seriously affect these results.

12 pages, 3 figures; expanded for clarity + minor changes, J-ref added

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Cited by in corpus (13)

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• Robust states in semiconductor quantum dot molecules
• Quantum interference and control of the optical response in quantum dot molecules
• Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules
• All-optical controlled phase gate in quantum dot molecules
• Optically induced spin gates in coupled quantum dots using the electron-hole exchange interaction
• Adiabatic optical entanglement between electron spins in separate quantum dots
• Optically controlled phase gate for two spin qubits in coupled quantum dots
• Using quantum state protection via dissipation in a quantum-dot molecule to solve the Deutsch problem
• Light emission properties in a double quantum dot molecule immersed in a cavity: phonon-assisted tunneling
• Fidelity of Optically Controlled Single- and Two-Qubit Operations on Coulomb-Coupled Quantum Dots