Quantum Computation and Bell-state Measurement with Double-Dot Molecules

Abstract

We propose a quantum computation architecture of double-dot molecules, where the qubit is encoded in the molecule two-electron spin states. By arranging the two dots inside each molecule perpendicular to the qubit scaling line, the interactions between neighboring qubits are largely simplified and the scaling to multi-qubit system becomes straightforward. As an Ising-model effective interaction can be expediently switched on and off between any two neighboring molecules by adjusting the potential offset between the two dots, universal two-qubit gates can be implemented without requiring time-dependent control of the tunnel coupling between the dots. A Bell-state measurement scheme for qubit encoded in double-dot singlet and triplet states is also proposed for quantum molecules arranged in this way.

5 pages, 4 figures

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Cited by in corpus (7)

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• Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules
• Dispersive Coupling Between the Superconducting Transmission Line Resonator and the Double Quantum Dots
• Configuration interaction calculations of the controlled phase gate in double quantum dot qubits
• Symmetric reflection line resonator for semiconductor circuit quantum electrodynamics
• Eliminating interactions between non-neighboring qubits in the preparation of cluster states in quantum molecules
• Discrete quantum Fourier transform in coupled semiconductor double quantum dot molecules