Location Qubits in a Multiple-Quantum-Dot System

Area of Science:

• Quantum computing
• Solid-state physics
• Quantum communication

Background:

• The development of a physical platform for quantum internet nodes is a significant challenge.
• Existing quantum information processing schemes often involve complex experimental setups.

Purpose of the Study:

• To propose a novel physical platform for quantum internet nodes.
• To introduce a simple and experimentally feasible quantum information processing scheme.
• To demonstrate the viability of location qubits and all-optical quantum gates.

Main Methods:

• Utilized a system of multiple crystal-phase quantum dots.
• Introduced and defined novel location qubits.
• Developed a method for constructing a universal set of all-optical quantum gates.
• Simulated gate performance in realistic structures, incorporating decoherence sources.

Main Results:

• Location qubits demonstrated robustness against major decoherence mechanisms.
• Simulated single-qubit gate fidelities exceeded 99.9% in realistic scenarios.
• The proposed scheme is conceptually simple and experimentally uncomplicated.

Conclusions:

• The developed quantum dot platform provides a clear path towards building multiqubit solid-state quantum registers.
• This platform features an integrated photonic interface, crucial for the quantum internet.
• The findings represent a key building block for the future quantum internet.