期刊
NPJ QUANTUM INFORMATION
卷 2, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/npjqi.2015.19
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资金
- EPSRC [EP/J015067/1]
- UNDEDD project [EP/K025945/1]
- European Research Council under the European Community's Seventh Framework Programme (FP7)/ERC [279781]
- Royal Society
- EPSRC National Quantum Technology Hub in Networked Quantum Information Processing
- EPSRC [EP/H025952/1, EP/H025952/2, EP/I035536/2, EP/I035536/1, EP/K025945/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1379428, 1102904, EP/H025952/1, EP/K025945/1, EP/I035536/2, EP/H025952/2, EP/I035536/1] Funding Source: researchfish
Individual impurity atoms in silicon can make superb individual qubits, but it remains an immense challenge to build a multi-qubit processor: there is a basic conflict between nanometre separation desired for qubit-qubit interactions and the much larger scales that would enable control and addressing in a manufacturable and fault-tolerant architecture. Here we resolve this conflict by establishing the feasibility of surface code quantum computing using solid-state spins, or `data qubits', that are widely separated from one another. We use a second set of `probe' spins that are mechanically separate from the data qubits and move in and out of their proximity. The spin dipole-dipole interactions give rise to phase shifts; measuring a probe's total phase reveals the collective parity of the data qubits along the probe's path. Using a protocol that balances the systematic errors due to imperfect device fabrication, our detailed simulations show that substantial misalignments can be handled within fault-tolerant operations. We conclude that this simple `orbital probe' architecture overcomes many of the difficulties facing solid-state quantum computing, while minimising the complexity and offering qubit densities that are several orders of magnitude greater than other systems.
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