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Indirect interaction of solid-state qubits via two-dimensional electron gas
D Mozyrsky1, V Privman, M L Glasser
1Department of Physics, Clarkson University, Potsdam, New York 13699-5820, USA.
Physical Review Letters
|June 1, 2001
Summary
We present a novel quantum computing mechanism for long-range coupling of nuclear spin qubits in semiconductor devices. This approach enables qubit spacing up to 100 nm, enhancing scalability for quantum information processing.
Area of Science:
- Quantum Computing
- Semiconductor Physics
- Spintronics
Background:
- Nuclear spin qubits are promising for quantum information processing.
- Achieving long-range coherent coupling between qubits is a key challenge.
- Current methods face limitations in qubit spacing and scalability.
Purpose of the Study:
- To propose a mechanism for long-range coherent coupling between nuclear spin qubits.
- To enable scalable quantum information processing in semiconductor heterojunctions.
- To maintain control and measurement fidelity with increased qubit separation.
Main Methods:
- Derivation of an effective interaction Hamiltonian for localized donor electrons.
- Evaluation of coupling strength mediated by a two-dimensional electron gas.
- Analysis of decoherence mechanisms and gate control strategies.
Main Results:
- A mechanism for long-range coherent coupling (approx. 100 nm) between nuclear spin qubits is proposed.
- The interaction Hamiltonian and coupling strength are theoretically evaluated.
- The scheme is compatible with existing semiconductor device technologies.
Conclusions:
- The proposed mechanism facilitates scalable quantum computing architectures.
- It overcomes limitations of shorter-range qubit interactions.
- This advancement supports the development of practical quantum information processors.