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A surface code quantum computer in silicon

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posted on 2023-06-09, 08:58 authored by Charles D Hill, Eldad Peretz, Samuel HileSamuel Hile, Matthew G House, Martin Fuechsle, Sven Rogge, Michelle Y Simmons, Lloyd C L Hollenberg
The exceptionally long quantum coherence times of phosphorus donor nuclear spin qubits in silicon, coupled with the proven scalability of silicon-based nano-electronics, make them attractive candidates for large-scale quantum computing. However, the high threshold of topological quantum error correction can only be captured in a two-dimensional array of qubits operating synchronously and in parallel—posing formidable fabrication and control challenges. We present an architecture that addresses these problems through a novel shared-control paradigm that is particularly suited to the natural uniformity of the phosphorus donor nuclear spin qubit states and electronic confinement. The architecture comprises a two-dimensional lattice of donor qubits sandwiched between two vertically separated control layers forming a mutually perpendicular crisscross gate array. Shared-control lines facilitate loading/unloading of single electrons to specific donors, thereby activating multiple qubits in parallel across the array on which the required operations for surface code quantum error correction are carried out by global spin control. The complexities of independent qubit control, wave function engineering, and ad hoc quantum interconnects are explicitly avoided. With many of the basic elements of fabrication and control based on demonstrated techniques and with simulated quantum operation below the surface code error threshold, the architecture represents a new pathway for large-scale quantum information processing in silicon and potentially in other qubit systems where uniformity can be exploited.

History

Publication status

  • Published

File Version

  • Published version

Journal

Science Advances

ISSN

2375-2548

Publisher

American Association for the Advancement of Science

Issue

9

Volume

1

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-11-23

First Open Access (FOA) Date

2017-11-23

First Compliant Deposit (FCD) Date

2017-11-23

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